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CKemu

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About CKemu

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    Star Forming

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    Male
  • Location
    Cornwall
  1. Thanks for that. I use the NEQ6 with PHD2 and the ASI120mm as a OAG gives me a range of 0.58" on good nights and with stronger wind conditions, I get up to 1.2", I average around 0.7", so that's within threshold. I just ran it through https://astronomy.tools/calculators/ccd_suitability to, and that gives me a Green in "OK" and "poor" seeing, and reasonable in "Good".
  2. Hi! So currently running an ATIK 414ex with my Esprit 100ED and Meade LX90 8", and mostly keeping my deep sky work to the Esprit. The ATIK 414ex has a resolution of 1392x1040 with 6.45um pixels, and it's a great camera, but I've had interest in making DSO images that are of a more printable resolution, and 1.44mp isn't really going to cut it. Now my budget won't stretch far, but I am looking at the ATIK 490ex, 3380x2704 resolution with 3.69um pixels (9.1mp, which is closer to something printable). I am curious as to how the small pixel size will effect overall resolution, I get the overall gist that shorter FL's do better with smaller pixels..but looking for the hive mind to help me out here. How will image quality be affected with the Esprit, would it be worth holding on to the 414ex for the Meade 8" setup? Any help and thoughts will be greatly appreciated.
  3. First time seeing and then imaging this object. Given the weather I decided to try and do the RGB in one night, so this is made from 180s x 60 (20 per channel). One thing I didn't take in to consideration, was shooting the blue when it got in to the muck on the horizon, so the data there got a little fuzzier. Wind was also a factor for once, I've found with the Esprit that wind speeds can be quite high and tracking isn't too bad, but every now and then (couple of minutes apart), I'd get a good 30mph gust. I am still trying to find methods for star reduction, this has had a "minimum" filter applied to the tars to reduce some of the stretch/bloat, and whilst smaller stars would be nice, I kind of enjoy the overall brightness and richness of the star field, it's extremely rare I shoot this directly in to the Milky Way.. Otherwise, very little processing, just a stretch and pretty much done.
  4. Messier 13 imaged with my Esprit 100ED and ATIK414ex using Baader RGB filters (30x240s in each channel). I have Bortle class 4 skies here, but I also have neighbours who love two VERY bright halogen lights, a street lamp and of course the Moon was about last night and the night before. NGC6207 and IC4617 are clearly visable, despite the insane distance involved with IC4617, which is very pleasing, as I've only ever tackled this object with my LX90 8" SCT. I am also enjoying "find the galaxies", and noticed a small cluster of them mid right, not looked them up yet, but always a thrill to capture more than you bargained for.
  5. Your first galaxy is a cracking shot! Brilliant given the sky conditions and one to be proud of! Nice work, here's to many more galaxies and clear skies!
  6. HaRGB - 20x720s in each channel. Shot between the 24th and 29th with technical gremlins, haze and my neighbours constantly on halogen lights and work. Was rather pleasant shooting this as I got to see a fair number of shooting stars, the space station and that pesky Moon rise later and later over the water. Shot with my Skywatcher 100ED, ATIK414ex, Baader HaRGB filters on the NEQ6, guiding done through ASI120mm camera, off-axis though PHD2 with an RMS of 0.7-0.9". Thanks for looking!
  7. Well lets just say my focus was a little off with the green channel, because...well not actually sure, this normally works fine, they're parfocal(ish) and I've never had this issue before, I shot in order of R,G,B - R,B in focus, G not...so pass on that. Also my neighbourhood has gained two new citizens and they love their new shiny outdoor lights illuminating their garden. Those gradients are grim!
  8. 1: I shall have to check my guiding set up, it's off-axis using PHD2/ASI120mm for the camera. From my calculations I have a roughly 2.41" per pixel scale on the ATIK414ex and my RMS last night was 0.58-0.70", which being less than half I would say that is well within bounds, but there was a few rough patches, possibly caused by breeze or in one case a dog. Guiding updates where every 500ms - perhaps to short? Seeing interfering with the guide. Graph looks a little rough, RA being noisy, with DEC showing more "pattern", though equally nothing that stands out over the entire duration of the guide. 2: No flattener, as I was under the impression my 414ex has a small sensor and wouldn't really be affected by the scopes edge distortion. 3: Possibly, it's something I shall have to investigate, M101 is pretty high, so will have to try various targets at different angles. Thank you for your help, really appreciated, this "passion", keeps throwing new things at me to get obsessive about. Five years ago, I would have been supremely happy with this result and not questioned a thing!
  9. This is a "RAW" stack of 6*720s images in the R channel using my Esprit 100ED and ATIK414ex, taken between 21:40 and 23:00 before the Moon started to blot the sky out. Hoping with several clear night forecast to build upon this with a set of 20 in each channel. I'm not entirely sure what to make of the stars though, in this project and a few others the stars aren't "smooth", not sure if it's me being OCD about tiny details, or an actual problem. When shooting with my LX90 8" and this camera/filter config, the stars where smooth gradients, however with the smaller stars in this image, there are dints, or brightness changes seemingly in random places on the star. Any ideas regarding this would be handy!
  10. Lunar Phases by Chris Kennedy, on Flickr Click image to see the video, and watch full screen for some of those details to pop. Over several mornings I've shot large mosaics of the Moon, with steadily decreasing seeing conditions. Despite breaking my body clock and surviving on naps, this has been a worthwhile endevour as I've always wanted to show libration, wasn't sure I'd manage it with so few data points, but happily this 4K video (well stop frame animation) shows the wobble nicely and the ever changing surface details. All shot through my LX90 8" SCT with the ZWO ASI290mm camera at prime focus, the largest image needed 42 panels, the smallest 24. Each panel was made from a 15 second video, taking the best 200 frames to stack, mosaic stitched in Microsoft ICE and then ported to Photoshop for a sharpen and levels tweak. Frames dropped in to Premiere Pro and looped for the final sequence.
  11. 73 Percent Moon (Waning) by Chris Kennedy, on Flickr Shot this through mist and pretty poor conditions around 3:30am this morning (had to let it get past some trees), worth it and really enjoying watching some of the craters transform as the shadows grow ever longer. Managed three nights, so had to put together a GIF, admittedly it's not very smooth as you've got a 99.4 waxing Moon, a 92% waning Moon and a 73% waning Moon all in the mix.
  12. 92 Percent Waning Moon by Chris Kennedy, on Flickr That big old Moon is getting in the way of my deep sky work (one day M104, one day!), so decided to set my telescope up at the bar I run to allow people to check out the Moon, and after looking up, I braced the sea air and strong breeze to put together this 7000x7000 mosaic of the Moon with my LX90 8" SCT and ZWO ASI290mm. Typically the new Moon phase looks to be clouded out, might have more luck capturing every phase of the Moon and making an animation!
  13. 99 Percent Moon by Chris Kennedy, on Flickr Shot last night using my Meade LX90 8" SCT with the ZWO ASI290mm camera - was especially fresh last night with a strong cold SW wind, which made the waves on the beach 100m down the road sound very soothing as I did my best to keep warm taking 38x15s videos @ 80FPS - best 200 staked and then stitched using Microsoft ICE and then a sharpen and levels applied in PS. Been ages since I've shot the Moon, as normally I am waiting for it to go away!
  14. Thanks for that, flats I'd considered for dust etc, but removing the vertical stripes I'd not considered, need to figure out how to take a solar flat, but otherwise this does seem like a reasonable solution. I am surprised at the "intensity" of the column response every other line - seems excessive/abnormal, so still waiting upon ZWO to make a response on their support forum.
  15. Recently purchased a the 290mm through FLO and broke the astronomers curse by actually having a clear day to use it within the same week of purchase! Madness! However whilst taking it for a test run on my Coronado Solarmax II 60 (BF10) I discovered that upon stacking and normal processing the sensor displays vertical bands every other pixel, they aren't solid, but it's as if the chip is reading every other column as darker on average. This happens with or without gain, independent of number of frames stacked, or software used, attached is a "raw" image and one that's had levels and a sharpen applied. It shows faintly in the raw and obviously enhanced with the sharpen. I have also attached one that's 5x zoom, just for clarity and detail. I have checked all software/drivers, they're current and tried different USB ports with no change in results. Did a little research and found about 4/5 of the way down in the following link, the page talks about pixel response non uniformity. http://www.astrosurf.com/buil/CMOSvsCCD/index.html - But I would not have expected it to be this apparent, and so badly interfering with processing/the image. I've posted on the ZWO support forums, and await a response - but thought I'd share here for discussion and thoughts. FireCapture v2.6 Settings ------------------------------------ Observer=Chris Kennedy Location=Cornwall Scope=Coronado Solarmax II Camera=ZWO ASI290MM(80453643) Filter=L Profile=Sun Filename=Sun_112444.ser Date=150219 Start=112414.267 Mid=112444.274 End=112514.281 Start(UT)=112414.267 Mid(UT)=112444.274 End(UT)=112514.281 Duration=60.014s Date_format=ddMMyy Time_format=HHmmss LT=UT Frames captured=338 File type=SER Binning=no ROI=1936x1096 ROI(Offset)=0x0 FPS (avg.)=5 Shutter=100.0ms Gain=15 (2%) Brightness=1 (off) AutoHisto=75 (off) AutoGain=off FPS=100 (off) AutoExposure=off SoftwareGain=10 (off) USBTraffic=100 (off) Gamma=50 (off) HighSpeed=off Histogramm(min)=29 Histogramm(max)=219 Histogramm=85% Noise(avg.deviation)=n/a Limit=60 Seconds Sensor temperature=22.6°C
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