Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

stargazine_ep25_banner.thumb.jpg.9e57eee22cad68fd6b67a87befeaa79b.jpg

Leaderboard


Popular Content

Showing content with the highest reputation on 31/10/20 in all areas

  1. 11 points
    Our warehouse will remain open. Our business is low risk so we can continue receiving and dispatching orders. I am pleased for my colleagues and our customers but am aware many businesses are not as fortunate so posting a happy smiley doesn’t feel appropriate. These are extraordinary times. Steve
  2. 9 points
    Processed completely in Gimp 2.10 Ha used as luminace - stretched separately and some light noise management and sharpening applied Created color as SHO color combination - pasted stretched Ha layer on top as luminance and used Channel combination to achieve wanted color feel of the image (no color is pure - all have been mixed in each channel to get this palette).
  3. 7 points
    Afternoon All, This one has been quite a while in the making as it seemed to get brushed to the bottom of the imaging pile, I finally pulled my finger out and finished off taking the RGB subs for the stars. and couple of extra Ha subs. https://www.astrobin.com/psc4hq/?nc=user Antlia Ha 3.5nm 36mm: 112x360" (gain: 139.00) -15C bin 1x1 ZWO 36mm Blue: 16x60" (gain: 139.00) -15C bin 1x1 ZWO 36mm Green: 16x60" (gain: 139.00) -15C bin 1x1 ZWO 36mm Red: 16x60" (gain: 139.00) -15C bin 1x1 Please do feel free to critique, it's mostly why I upload these as it's the best way to learn. Wyvern
  4. 7 points
    We will know for sure after Boris has delivered his address to the nation (watching BBC news as I type!). We didn’t need to close last time so don’t anticipate needing to this time. Our premises in Exeter is not a retail showroom, it is a warehouse. All staff that can work from home are doing so, myself included. Other than postmen and couriers we are not receiving visitors at the warehouse. We have also been COVID-19 risk assessed. I am confident we are doing everything possible to stay safe and stay open. HTH, Steve
  5. 7 points
    Hooked up the Canon 200mm 2.8 to my 1600MM last night to see if I could get sharp stars across the field. The subs for this are awful, it was literally imaging through high cloud and haze. However once the really bad subs were removed and it was stacked its come out reasonably ok given the conditions. 3 hours with 1600mm and baader f/2 HA filter, Canonn 200mm at about f/4
  6. 7 points
    Here is my process. in HaSHO Mostly levels and curves and selective colour in Photoshop. A bit of HP filter. Ha used for a 2nd time as luminance. I've never imaged this target, so it was a pleasure and also interesting to do.
  7. 6 points
    Thinking of future plans and with their prices discounted so much at the mo... I already have the 8-24mm zoom but when I pass a scope on to my daughter I thought the 7-21mm would be handy to go with it along with a good diagonal. Also decided to join in with astro-themed masks in part because I wanted a couple new ones that are a more comfortable fit. Sorry Nigella, that'll be total cloud for a couple days then, tho not only down to me
  8. 6 points
    Concenter Visus An improved version of the Concenter I had. Easier to focus on the circles and can be used at night as well.
  9. 6 points
    What do you call a reflector in the Lake District? A rain gauge. What do you call a refractor in the Lake District? A buoyancy device. What do you call a domed observatory in the Lake District? A coracle.
  10. 5 points
    Hi Ive been messing with this one for quite a while but ultimatley had terrible RGB data especially in green, i think at the time of shooting the green had either been affect by high cloud or even sunrise, this was shot back at the start of September. This is taken with ASI1600mm with Samyang 135mm Ha - 29 x 300sec R - 30 x 120sec G - 12 x 120sec B - 30 x 120sec
  11. 5 points
    Hi Everyone! This has been a disruptive year for me (even apart from the pandemic) resulting in a house move right in the middle of nebula season! But while temporarily staying at my mother's house with my equipment, I managed to get a couple of nights' worth of data of M31 from her garden in Tooting, South West London. I lost quite a few subs to...foxes triggering the neighbour's security light! But got a good amount of data. This year I managed to get more Ha into the image by masking the stars and blending it with the red channel. 8 hours of LHaRGB data - captured in Bortle 8-9 skies. WO Z73/ASI1600/CEM25P combination. Full details here Thank you for looking!
  12. 5 points
    Reading favourable reports about the svbony zooms, thought i may as give it a try £56 and my first ever purchase off ebay. Ordered Thursday and arrived this morning. It's not far off the size of my trusty 102.
  13. 5 points
    Been wanting to upgrade my focuser for a while, so a nice little project whilst it’s bucketing down.
  14. 5 points
    We had a constant stream of high cloud and haze last night but atmosphere seemed relatively steady so had a quick crack at mars despite. Quite surprised so much detail visible given the conditions. 250PDS with 3x barlow.
  15. 5 points
    Having stopped about 5 years ago, I decided I missed astrophotography (remind me why!?). Many teething issues with kit not talking (ASIair Pro) and whatnot but I finally managed to get out last night and get about 300 x 60s exposures on M45. As I'm using an Astrotrac at the moment I'm limited to about 2hours or shooting before it has to rewind. Trying to reframe the shot again to get it close to the first 2 hours is pretty much impossible, so I had to crop it a bit to get rid of the edges. Anyway, kit was ASI533 with Samyang 135/2 @f2.8. Mounted on the Astrotrac and captured with the ASIair Pro. Processed in Pixinsight (that was a cold sharp remind of what I'd forgotten too). It's not incredible, but I'm happy with it as a first image back. Lots of room to improve though! Next upgrade will be a goto mount lol. AZ-GTi maybe? Thanks, Phil.
  16. 4 points
    I have written a short description based on this image and the physics happening around the core region of M106: https://www.astrobin.com/uk8p8v/ It is for those that are interested in the physics of outer space (as I am). In this forum, I would like to say a bit about the image processing part as that might be of interest to some of you using PixInsight. Note that I also posted this on CN....... The goal This image was processed with the plan to show the main features of the interesting activity that M106 shows around the core. As such, saturation and color contrast have been turned up quite a bit (masked). Ha addition to RGB galaxy data The anomalous arms (see Astrobin for the explanation) are fairly easy to see in a Ha image, but getting the delicate gas streams well defined added to an RGB image proved to be very finicky as the contrast between them and the red background signal is not that high. Furthermore, this is an image made with an OSC and a STC-DUO multi-narrowband filter. The Ha signal is only captured by the red bayer filtered pixels, hence diminishing the spatial resolution of the Ha part. I struggled quite a bit and after some experimentation with adding Ha in the non-linear phase using image scale operators, I ended up with a manual subtraction of the red continuum in the linear phase, as described in an accessible way by Luca Radice http://www.arciereceleste.it/tutorial-pixinsight/cat-tutorial-eng/85-enhance-galaxy-ha-eng . I used both a "clean" Ha derived image and a range mask from that "clean_Ha" image to add the clean Ha contribution to the image. Note that the continuum subtraction method only works with linear data! Using this on non-linear data turns the whole area red. There is also a CS (continuum subtraction script) script that should do the arithmetic of the Ha fraction to the red signal, but that did not give me an acceptable result.I do not know why. Star Halo Reduction My telescope/filter/camera combination gives me prominent halo’s. I used the method described by Nuno Pina Cabral to reduce the worst of them. You can find the method here.: http://nunopinacphotos.blogspot.com/2016/03/how-to-remove-star-halos-using-wavelets.html Note that I used HDRMultiscaleTransform instead of ATrousWaveletTransform (or MLT/MMT for that matter) as it gave me somewhat cleaner results. The beauty of the method is that it tackles all halo’s in one go. EZ Processing This was the first time I also used the EZ_suite noise reduction and deconvolution scripts. Works brilliantly (although I did have some PI crashes, but I had been warned….). What a nice concept that is. I hope that this description adds something to someone's PI journey. Processing this image took nearly as long as the total exposure time as I had to find my way into the methods above and because I made a lot of image versions varying the amount of Ha contribution before settling on this one. Equipment and acquisition details,, together with a larger version of the image and the physics explanation on Astrobin.
  17. 4 points
    Well that was incredibly easy!
  18. 4 points
    4hrs 28mins data 240 sec subs , taken over three nights , dithered in APT , idas D2 filter, Nikon D5300 , Tecnosky 70Q stacked in DSS processed in Startools 1.7.430 ,flats and bias as darks taken .
  19. 4 points
    Sorry everyone.... It must be me, I'm the Jonah. In the past two years my interest in Astonomy was revived dramatically after a thirty year break, and I set up a permanent Pod observatory and all the toys that go with it. (SWMBO's definition of my purchases.) I can't help it, the range of fairly affordable equipment is fantastic now, compared to back in the 70's.... I must admit I was surprised at the comparitive rarity of "good seeing conditions", or even just clear 'ish skies. However, there's no danger of me giving up, because I'm fortunate to have retired to a very rural Bortle 4 location, so when it's good, it's really good. As others have alluded on this thread, the secret is to have other interests, and luckilly none are dependent on clear night skies ! Although a permanent garden observatory is a considerable indulgence financially and space-wise, (no pun intended), it actually compensates greatly for the sporadic nature of good seeing conditions. It sits quietly out there, scopes mounted and at ambient temperatures, computer all plugged together, mount polar aligned, all set and ready to go within 5 minutes. Even just an hour's break in the skies is conveniently do-able with just 5 minutes to set up and 5 minutes to clear down. The prospect of setting up all that gear out in the open would be very daunting.
  20. 4 points
    Anyone observed this comet yet ? According to the "Heavens Above" website and Cartes du Ciel, it is currently a bit brighter than magnitude 8 and in Lepus and soon to be in Orion. It will be just 1.25 degrees from Rigel on the 4th November so easy to find if you can wait until Orion has risen fully.
  21. 4 points
    Absolutely fine by me! What a great and encouraging start. I'm afraid I am in no position to offer advice because having taken an initial 'try it out' image of M31 (above) and had a more serious attempt at the Bubble ..... ...... my RC has been packed away in it's box in anticipation of a house move. Focus is tricky. I upgraded mine with a Baader Diamond SteelTrack and printed a bracket to allow me to attach a SW dc focus motor but other than taking one image of Mars which I'm too embarrassed to post that's all I've managed. Good luck with your RC and I look forward to seeing more of your images. Adrian
  22. 4 points
    Attempting a different colour blend this time, hoping to get a more 'natural' feel. Red channel is 50:50 SII:Ha Green channel is 75:25 OIII:Ha Blue channel is all OIII Some further adjustments in Photoshop to get to this final result.
  23. 4 points
    As expected, amazing data once again! Here is my first attempt; I'll probably update this but it just goes to show what is possible... Cheers
  24. 3 points
    Hi all my first scope has finally arrived after years of viewing through small bins! Thanks to FLO for great service can’t wait for some clear skies later this week but first of all a couple of mods to the scope
  25. 3 points
    Quick process from tonight. Laptop driving me crazy running low on RAM and dropping frames even though system resources showed only 40% memory usage. Think I've probably over cooked the wavelets on this.
  26. 3 points
    If I had to spend that much I'd probably go with iOptron CEM40 and a Celestron EdgeHD 925 but it depends a LOT on what kind of targets you want to shoot. BUT If you're just starting out I don't think you need to spend that much. A SkyWatcher HEQ5 Pro or iOptron CEM25p paired with an 80mm apo like SkyWatcher Evostar 80ED will net you some amazing shots of wide field targets.
  27. 3 points
    Second time around buying this. 2nd most important purchase after the mount
  28. 3 points
    If you want to find out why people near Chippenham are particularly favoured next week, you'll need to see the latest edition of the Binocular Sky Newsletter . As well as the usual overview of DSOs, variable and double stars, this month we have: Two grazing lunar occultations Four Mira stars near maximum Ice giants in the evening sky A meteor shower with bright persistent trains Elan Valley Dark Sky Day (online) I hope this helps you, especially those of you under lockdown, to enjoy these long November nights with your binoculars or small telescopes. To pick up your free copy, just head over to http://binocularsky.com and click on the Newsletter tab, where you can subscribe (also free, of course) to have it emailed each month, and get archived copies.
  29. 3 points
    Sharpless2-171 is an emission nebula which is part of NGC 7822, in the constellation of Cepheus. It is often called the "teddy bear nebula", however viewed in SHO with this rotation it looks (to me) like a screaming skull, or the head of the Balrog from lord of the rings! Perfect for Halloween. Ha 36 2hours 24min OIII 37 2hours 28min SII 38 2hours 32min Imaging camera: ZWO ASI1600MM Telescope: ED80 DS pro with 0.85x flattener Mount: EQ6-R Pro
  30. 3 points
    The switches are ON OFF. You can use the 3p ones by using the center pin and one of the outside buttons as already pointed out. They are not momentary switches. The 3p ones use are ON OFF. You can use 2p on-off ones if you prefer. You really don't need them though as the software can do that already. The confusion is more about the fact that they are often mislabeled on ebay or aliexpress.
  31. 3 points
    Woohoo! It arrived, after a little bit of fiddling in the Ubuntu WiFi settings I was able to get a rock solid connection to the mount, and with some extra fiddling around in the terminal I was able to expose the web interface for the PMC-Eight's onboard WiFi Module, hopefully this'll mean I can put the thing into Client Mode and have it run as a device on my network... Thanks for exposing me to this mount @Lockie
  32. 3 points
    Hi Andrew, Just as a follow up to show the improvement on the CEM25P Edge combo, here was my second attempt at a galaxy, M81...with further refinement and improvements to the overall rig, this scope can definitely work on the CEM25P...you've got to want it though! Thanks for the kind words!
  33. 3 points
    I had lots of fun putting this together, so hopefully it's fun to watch as well as educational.
  34. 3 points
    Francis @fwm891, Adrian @Adreneline Hope you don't mind me adding to this first light thread - I wasn't sure about the best place to put it but thought joining a thread may be better than a brand new one. With mixed skies tonight I thought it might be a good chance to get the StellaLyra RC6 outside for its first light. Collimation inside looked OK with eyecap and Cheshire - just a small tweak of the secondary performed. These photos aren't great but this is roughly how it looked! Any tips welcome. As usual the forecast was being optimistic and it was really challenging dodging the clouds so I didn't spend any time looking at a star test this time. Some cloud made it into the subs, but here are two targets (M27 and NGC 457) - both 30x30s (15 minutes each) - with the ASI533. I was breaking all the "rules"... guiding was a shocker - half the imaging scale you say? Not tonight, try 2-3x the imaging scale. Focus was a challenge and something I'll have to work on. Quick 5 minute process in PixInsight - to be honest more time wouldn't get more quality anyway Thanks for looking and I'm keeping an eye out for future images from your StellaLyra RC6s and the bigger RC8s in circulation.
  35. 3 points
    Orion, Horsehead & Flame nebulae. A bit of fun over two nights:- One night capturing without filters One night using L-enhance for Ha and OIII 120 & 180s subs with calibration files. Registered against each other in Astro Pixel Processor then merged in Photoshop CC William Optics Redcat 51 Canon Eos 60d (stock) Skywatcher Staradventurer Zwo ASIair Pro controller
  36. 3 points
    I kind of feel like I shouldn't be entering here being still something of a novice, but here goes anyway. Using the RGB combine tool in APP, playing with the multipliers to get what looked to me like a nice colour balance. Then made a starless version using Starnet++ for Windows allowing me to stretch the nebula quite far in Photoshop, and then overlaid the stars back on from a less stretched version with stars still in. I have to say though, with data this good the trick is just trying not to ruin it I think. Hopefully I've not butchered it too badly.
  37. 2 points
    As seen as I really board right now due the never ending bad weather, I find myself exploring star charts and planetarium programmes for obscure targets when the skies finally clear. I happened upon Campbell’s Hydrogen Star and wanted to ask the membership if anyone has observing experience. I realise plan nebs are often very small and I am using a six inch newt but any tips on observing this for the first time would be most appreciated. I have asked the good folk of the EEVA section if they have experience and any visual examples they can share. Fingers crossed for clear skies. Marvin
  38. 2 points
    In the meantime I have reprocessed and come up with this which I think is a little better.
  39. 2 points
    For that kind of money, you can get into some seriously heavy rigs. How much weight are you willing to lift? How much space do you have in your vehicle to haul a scope and mount? How much storage space do you have at home? As far as my recommendation, I'll relate a recent experience I had. There was a newbie at a star party here in Texas with a brand new Celestron NexStar Evolution 8" EdgeHD. He was happily, wirelessly controlling it with a tablet running planetarium software. With a 10mm Delos, it was providing an excellent image of Jupiter and other targets that night. It was super easy to select targets within the planetarium software on the tablet. Once selected, the mount quickly slewed to the new target and kept it perfectly centered. The Starsense made alignment a cinch as well. This rig would be easy to store, setup, transport, and use. It would also leave plenty of money from your budget for eyepieces and other accessories. 8" is a sweet spot for astronomy. Big enough to provide good views of most objects and yet not so big as to put off using it due to inconvenience.
  40. 2 points
    Superb data as always. Pleasure to have a go at processing it specially after 6 weeks of cloud. Processed in photoshop as HSO palette.
  41. 2 points
    pics soon. its in London , ready for courier so should get it soon . can you tell im excited
  42. 2 points
    It's going to be nothing fancy but I'll finally have an observatory. It will be a lift off roof initially but I will convert it to a roll off next spring when the weather turns. Started on the pier, I've gone for a Todmorden pier on cost grounds. Purchased the blocks, dug out the base and concreted in. Built the pier, fixed with bolts and adhesive. It's as solid as a rock. Next step is to fit the pier adapter, brake disc type for my HEQ5, after I've drilled out bolt holes in it. The paving slab is only there because I was using it to stand on as the garden was soaked after a lot of rain. Pier faces North with the picture facing South. I have good views all around apart from some trees in the South which can't be helped.
  43. 2 points
    One final attempt at this from me, this time in HaSHO.
  44. 2 points
    In this price range it is important that you buy from a place that has a good return policy, or go to a brick and mortar store where you can try before you buy. QC will be up to you. Prepare yourself for that and read up on how to test binoculars.
  45. 2 points
    Hey Everyone I wanted to share with you my Pelican Nebula Reprocess along with my narrowband imaging process. I will be using PixInisght for this tutorial along with Photoshop, Starnet, and Topaz Denoise AI. I have used these in only one other image and found them to be pretty useful on narrowband data sets. Topaz has a free trail version if that is something you may be interested in trying. This software seems to becoming somewhat popular (controversially so), so I really wanted to give it a try and see what it was all about! Your own noise reduction processes can substitute this step in my video... which is what I normally do. as I prefer doing NR in PixInsight. I personally find that starnet is extremely useful but topaz is useful only in certain situations and I have only had luck using it a few times. It does create artifacts if you are not careful and small adjustments can really go a long way. Use at your own risk! This is a somewhat unconventional approach to noise reduction/sharpening but.. it can work.The link to the video can be found in my bio. I found that this is a pretty basic workflow and gave me good results with my narrowband data. We shall see how it works on the next dataset!For this dataset I collected 12 hrs of data on the Pelican Nebula through my 10" F/3.9 Quattro with my asi1600mm-p / Astrodon 3nm SHO filters. I have made some color tone changes to the photo below so it will not exactly compare in color to the one in the video but the processing was the same. This came down to a change in creative decision I hope you all enjoy and ultimately find this helpful!———————————————Basic processing workflow:• Stretch SHO data• Combine HA/SHO/OIII in pixelmath• Starnet Ha data and SHO combined image. (Be sure to save SHO image with the stars in it. We will use it later)upLoad starless HA image into topaz denoise and make appropriate adjustments. Save• Upload HA photo from topaz denoise back into Pixinsight• upload starnet SHO image to PinInsight• color correct SHO image• Use HA data and luminance layer over SHO image• Final color corrections. Save• Upload new image into PS and add stars.
  46. 2 points
    Good catch! You can check for flares in the solar event lists published by NOAA here: ftp://ftp.swpc.noaa.gov/pub/indices/events/ The README file explains the notation used. For instance, on 10/18 there were several B-class flares: :Product: 20201018events.txt :Created: 2020 Oct 21 0357 UT :Date: 2020 10 18 # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # Please send comments and suggestions to SWPC.Webmaster@noaa.gov # # Missing data: //// # Updated every 5 minutes. # Edited Events for 2020 Oct 18 # #Event Begin Max End Obs Q Type Loc/Frq Particulars Reg# #------------------------------------------------------------------------------- 7010 + 0204 //// 0204 LEA U RSP 025-030 III/1 7020 + 0243 0244 0244 LEA G RBR 245 100 7030 0248 0252 0256 G16 5 XRA 1-8A B1.8 5.9E-05 2776 7030 + 0250 //// 0251 PAL C RSP 120-180 III/1 2776 7030 0251 0251 0251 LEA G RBR 245 110 2776 7030 0254 0254 0300 LEA 3 FLA S15E22 SF 2776 7050 0314 //// 0354 PAL C RSP 025-038 III/1 7060 0551 0558 0604 G16 5 XRA 1-8A B1.0 6.4E-05 7070 + 0852 //// 0857 SVI C RSP 065-080 III/1 7080 1313 1321 1326 G16 5 XRA 1-8A B1.0 6.8E-05 7090 1420 1429 1437 G16 5 XRA 1-8A B4.0 2.6E-04 2776 7090 + 1424 1427 1443 HOL 3 FLA S14E16 SF 2776 7100 + 1612 1642 1654 HOL 3 FLA S22W71 SF 2777 7100 1626 1636 1643 G16 5 XRA 1-8A B1.7 1.1E-04 2777 7100 1633 //// 1634 SAG C RSP 049-180 III/1 2777 7110 1658 1700 1737 HOL 3 FLA S22W72 SF 2777 7120 1738 1745 1833 HOL 3 FLA S22W72 SF 2777 7130 1834 1853 1900 HOL 3 FLA S22W75 SF 2777 7130 1836 1842 1851 G16 5 XRA 1-8A B1.2 1.0E-04 2777 7140 2004 2004 2010 HOL 3 FLA S23W76 SF 2777 We're interested in XRA (X-ray event) and FLA (flare visible optically in Hα; I guess a FLA will usually have a corresponding XRA). Check your recording time to find out which was yours.
  47. 2 points
    Firstly collimation is a touch off but close. Images taken with a Nikon D5100 mono modified DSLR mounted on an unguided CEM25P. No filters used. Processing in PI: Star alignment, Imiage Integration, Histogram Transform, Curves Transform, STF and Image Crop to remove the boundary. Sub frames: Taken @ 800 or 1600 iso, uncooled body, all subs 30s taken using a 5 second delay before each sub manually operated shutter (couldn't find the intervalometer) Sub details in the file names. Moon above the horizon throughout. Variable high level cloud
  48. 2 points
    This week we are joined by Paul Money of http://www.astrospace.co.uk/. Paul is very well known for his extensive talks and as review editor for BBC Sky at Night magazine. He also publishes his yearly 'NightScenes' sky guide - an extremely useful book! Paul is going to join us and take a look through 10 astronomical images that have been inspiring him through the years and look at the stories of and sometimes behind the images. If you've not seen one of Pauls talks before you are in for a treat, there are few more passionate and energetic astronomy speakers out there and it's always a pleasure to attend one of his talks. This should be very interesting and entertaining, hope to see you there! Meeting details below: Topic: EP25 - Sunday, 1st November 2020 7:30pm GMT - Images of the Universe by Paul Money Time: Nov 1, 2020 07:30 PM London Join Zoom Meeting https://zoom.us/j/92069436395?pwd=Q2hqRTBhMUxNdWNKNVhXTGtPTmdjZz09 Meeting ID: 920 6943 6395 Passcode: 903667
  49. 2 points
    Just a wee update. I have had numerous messages (not from this site but via ABS and various FaceBook groups) offering used scopes at very close and in some cases higher than new prices. I know that most suppliers don't have any stock at the moment but just for the sake of clarity....... I am an astroimager at heart - patience is in my DNA I am not in any massive hurry If you are skelping you wont get a reply. I wont pay more than about 65% of the new price.
  50. 2 points
    First things first - don't worry about under sampling. Two reasons for that - first is that under sampling is not a bad thing in itself. It is just a working resolution and lower working resolution just means wider field of view (over sampling is a bad thing as you loose SNR and gain nothing in return). Second thing - you are worrying about under sampling with camera lens. You should not. Camera lens are not diffraction limited and star image that they are producing is much larger than aperture would suggest. To prove my point, here is measurement of Samyang 85mm F/1.4 lens that I did with artificial star: No filter at F/1.4 - Red: 2.66, Green: 2.48, Blue: 2.30 No filter at F/2.0 - Red: 3.82, Green: 2.28, Blue: 2.42 No filter at F/2.8 - Red: 2.53, Green: 2.36, Blue: 2.31 No filter at F/4.0 - Red: 2.24, Green: 2.27, Blue: 2.29 Values that you see are FWHM of different channels expressed in pixels and pixel size is 4.8µm. Best of these values are around 2.3px or if we convert that into microns - 11.04µm. FWHM of 11.04µm requires pixel size of 6.9µm to be properly sampled. In the case of this lens, and probably most of other lenses (don't think that other lens are much better than this one - this is pretty good/sharp lens) - it is neither seeing nor tracking that produces blur, it is lens itself. They are far, far from diffraction limited optics. Btw, this is what star looks like at F/1.4 And this is what it looks like at F/2.8 (and above sampling with pixel size of 4.8µm): While slightly over sampled (yes indeed even at F/2.8, 4.8µm pixel size is over sampling rather than under sampling), this star looks rather nice. Going further to F/4 will not make much of a difference: Bottom line - don't worry about under sampling, if you are happy with FOV for your intended targets at focal lengths that you work with - go for ASI294. It has best size/£ ratio and it is very decent performing camera.
  • Newsletter

    Want to keep up to date with all our latest news and information?
    Sign Up
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.