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brenski

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Everything posted by brenski

  1. thanks Michael. there's a little bit of a mind-bend happening here. i've read so many articles/tutorials/books etc on this and they all claim the same thing: 500/focal length = max exp (before drift appears). therefore with a 15mm lens, this should give around 20-22secs before drift becomes noticeable. In truth, I've just been looking at two different books: (Night Sky - Jennifer Wu / Landscape Astrophotography - Mike Shaw), both confirm untracked imaging with a cropsensorand 15mm lens, should be fine around 21/22 seconds. so, this has me utterly bewildered.
  2. thanks guys. One of the other images I'd take was around 12secs - it still has some coma - nowhere near as much, but it is there nonetheless. Attached image is shortest length exposure taken: F/2.5, 12.5sec, ISO6400 Do you think it's any better? Much of what I've read suggests 30secs untracked for Milky way shots, but that's appears to be not possible. So, how with <15secs do I capture enough to be able to get decent Milky Way detail? what exposure time can I reduce to and still obtain reasonably-detailed Milky Way shots? What about processing? What do you do to bring out the best of an image?
  3. I'm really hoping someone can help with this one. A little bit of background: Initially, I thought the issue was build quality of Samyang 14mm lens. However, I've now purchased a better lens and been to a dark sky site to take his latest batch of Milky Way images. Equipment: Canon 200d, Irix Firefly 15mm F/2.4 lens, tripod, shutter release cable. Settings tried: ISO 800-3200, shutter 20-25secs, aperture F/2.4-and various stops down. Issue: Stars are dashes (even in centre image). This was the same issue with the Samyang (previously). I'm now struggling with why the Irix is producing the same results. Could it be the Canon 200d has a problem? Note: I've also tried OFF/ON settings for each of the following (in different combinations): Lens Aberration High ISO NR Mirror Lock Results do not change. Does anyone, have any ideas that may help me resolve this? thanks
  4. I've an SV Bony Sv205 planetary which I'd like to try using as an allsky? is this possible? I can't seem to locate a suitable adapter for the lenses I have. Here's the equipment I was hoping to get working together: 8MP SV205 USB3.0 for Planetary https://www.svbony.com/sv205-astronomy-camera with either of the following two lenses: https://astronomy-imaging-camera.com/product/zwo-13-2-1mm-150-degree-lens or https://www.ebay.co.uk/itm/402026850723 IR Board HD 5mp 16mm Lens For Security IP Camera standard M12x0.5 thread is there an adapter that will do this? I'd like to try and rig this up with sharpcap for the Perseids in 3 weeks' time
  5. the stars in the crop are from the centre of the image the distorted effect is consistent across the entire image
  6. the images are centre-ish of the image. this evening i've tested the Canon 18-55mm kit lens - it produces nice round solid stars @ F/3.5. so i'm veering toward this definitely being another Samyang issue
  7. I’d had a few issues with my Samyang 14mm F/2.8 lens. the “trident-shaped” glare to images (on my Canon 200d). (see image 1) prompted me to contact Samyang. So, off it went to Samyang’s (Intro 2020) Service HQ UK. After inspection they concluded that there were problems with the lens – but as it was out of warranty, they could replace it with a shiny bright MkII version (complete with focus lock) for a reduced price. However, after play-testing, images appear to have a curious (different) mis-shape to them (see image 2). I was assured by Intro 2020 that the MkII is a great lens, and I have contacted them, but while i await their reply, is there anything else i can try to be sure. could this be the camera itself? or have i just been unlucky with two lenses? seems that even stopped down to F/4 (see image 3) there's still something going on. am wondering if any of the following Canon 200d settings are likely to help, and if so, what should i opt for? ♦ Mirror Lock ♦ Lens Electronic MF ♦ Lens aberration correction ► Peripheral illum / Chromatic aberr / Distortion / Diffraction ♦ White Balance ♦ Colorspace ♦ Auto Lighting Optimizer ♦ Long Exp Noise Reduction ♦ High Speed ISO NR or anything else "on camera" that may help? Note: crops (below)) are not taken from edge of image.
  8. agreed, but I also think my Canon 2ooD could be part of the problem. I've tried with the following settings: With the camera in Manual Mode and shutter set at bulb. I'd set it up to take 77x 2-sec shots - at 1sec intervals. Hahnel Captur (wireless) settings: DELAY: 00:00'00" LONG: 00:00'02" INTVL 00:00'03" INTVL1 N 77 INTVL2: 00:00'01" <<< i cannot remove this setting, even removing batteries the value returns when powered up INTVL2 N: I don't think the camera can process the images at that rate, the reason I feel this is that a wired intervalometer I also use (with identical settings) also produced the same outcome: Basic Cable Intervalometer settings: DELAY: 00:00'00" LONG: 00:00'02" INTVL: 00:00'03" N 77 In both cases the results are 2 single shots - and not the 77 as input. what am I doing wrong? or, is there some 200D setting i need to change? Camera is NOT in Drive Mode.
  9. my 3rd and 4th attempts - lots of activity - ISS? and other satellites?
  10. Recently bought an allsky setup, and after a few dodgy starts - hot-pixel prone camera etc, i'm steadily improving the quality of my captures. Equipment Used: Dell Optiplex 780 USFF Intel Dual Core E5800 3.20 GHz PC, running Sharpcap Pro. Zwo ASI120MC inside Allsky enclosure fixed to 45 degree 6" s/steel elbow, inserted into flagpole mount
  11. @PeterCPC thanks - tried - but no joy. I think this could be down to the frame rate - as @johngm suggests. i'll try again on next clear evening and see what happens.
  12. just a quick update, the .avi file properties: length: 00:00:36 frame width: 3096 frame height: 2080 data rate: 772787 kbps total bitrate: 772787 kbps frame rate: 5.00 frames/second file size: 3,516,180,992 (3.27gb) would there be a valid reason for VLC refusing to play this?
  13. Hi recently bought one of these cameras. i'm completely new to imaging, but really keen to make progress. at the moment I've got the ZWO ASI178MC connected to a Netbook PC and a Bresser 75/350 (i intend to use my SkyWatcher 200p) and have used the default ASI software to get the image below - i would like to think i can do much better than this. ■ better software to use for capturing images and video - for lunar, solar, planetary and dso ■ best settings for images and clips ■ what video filetype VLC will recognise and playback (ASI's .avi is incompatible with VLC - it will work in Windows Med Player) ■ how to "know" you've got DSOs worth processing, when these can't actually be seen onscreen moon.mp4
  14. Steve, John & Des - thanks for your lightning-fast replies. as you can see from above - following my mental abberration, I discovered the whole point of the cigarette- lighter-type connector cable
  15. i knew this'd be a newbie error - just discovered. needed to be using the "cigarette lighter type" connector. all good now. just need to balance, and wait for a clear night. thanks for your reply
  16. scope, mount and controllers came from ebay seller - 12months old stated "like new" fully working my understanding is that - even if the mount were not connected, the power tank being linked to the synscan EQ5Pro should power up the synscan hand controller display - at the very least?
  17. Hi on the advice of more knowledgeable folk, I've taken the plunge and bought myself a complete SkyWatcher Explorer 200P 8" Telescope + EQ5 PRO GOTO Synscan computerised mount and I was hoping that the purchase of the 12v DC Power Tank and the 2.1mm>2.1mm cable would have the handset power up. (I've been assured that the Power Tank and cable are correct - and BOTH are brand new. no such luck! - I'm thinking I've missed something obvious - a newbie error? any help appreciated.
  18. Hi David & Cornelius I was hoping that the Star Adventurer Pro would do what it claims it does. Hoping to setup my Canon 200D with Pentax Takuma 200mm to take some DSO shots. Seems like sellers don't tell you all of the equipment you'll need to get things up and running. Had no idea I'd need an additional guide scope and camera combo? talk about rabbit-holes. Retailer was clear that the Star Adventurer Pro with a decent tripod would be all i need. hmm.
  19. Hi Hoping someone can advise: I've recently bought this - because it is recommended as a good fit for DSO/Astro imaging sky-watcher star adventurer pro pack https://www.rothervalleyoptics.co.uk/skywatcher-star-adventurer-pro-pack.html I'm now getting conflicting information about it - always seems to be the case immediately after a purchase. ■ what tracking software would i used to help with imaging? - i plan to use (windows 10) tablet pc with usb cable connected to the sky-watcher. ■ if there is no tracking software available - how would I track? i am thinking I'm being completely stupid here and have missed something obvious. thanks
  20. just got myself the Sky Watcher Star Adventurer Pro - this is the one with the better tracking capabilities. have been told one of these Surveyor Tripods: https://www.ebay.co.uk/itm/surveyors-tripod/254296551970 is the best bet for a more solid base. question: are there adapters that will affix this tripod to the Star adventurer?
  21. wasn't planning "untracked" - my post above suggested the Sky-Watcher Star Adventurer. But I was told that the Takumar 200mm would be asking too much of that tracker mount. ■ would the takumar 200mm work better with the iOptron skyguider pro? ■ what software would i use with the iOptron skyguider pro?
  22. hi, yeah I do already have that book - but every piece of equipment seems to cost a proverbial arm and several legs. I've had advice that the Pentax Takumar 200mm f4 is the perfect lens for AP - but if 200mm breaches the "tracking limitations" (100mm is recommended by Steve Richards) - then how is the 200mm Takumar supposed to achieve its high accolades for AP? is this about tracking issues with that lens, or is it about the mount alone? if so, which mount would make the Takumar the goto for AP?
  23. Hi lots of great advice. so, if I keep imaging and visual separate of each other: ■ Seeing: my nexstar 127SLT is good for visual? ■ Imaging: I've (following some recommendations) got myself a Pentax Takumar 200mm F4. I intend to use this with my Canon 200D on a very sturdy camera tripod - hopefully to get some nice clear DS images (nebula etc). I was looking at this Sky-Watcher Star Adventurer Mini as my AP tracking mount. However, I've been advised I'll need a better mount as, this mount will likely only be good for 100mm lenses. So, what's a decent (but not bank-breaking) alternative mount?
  24. @noah4x4 is there any link to the Skyportal instructions? - this sounds much easier i'm finding at the moment, if i come back to the scope after a day or two, the usb connection isn't sure which com port the handset was on.
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