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About cotak

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    Star Forming

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    Toronto, Canada
  1. The min temps are based on the commerical electronic components ratings, but those are nothing more than suggestions in reality when you talk lower end of temperature. I have used the ieq45 pro and cem25 at -25C many times without issues. Even when the ieq45 been cold soaked for a few days outside in the observatory. So don't worry too much about that. Since we have such wide temperature ranges here in Canada, the eq6 would likely require different worm mesh adjustments to achieve best possible performance based on temperature. And if you are hauling it in and out that might be an issue if you want to do the adjustments in doors. My ioptron mounts work the same without adjustments whether it was approaching 40C out or -25. As for forever. Never say never. Although for most people who aren't very wealthy or just spending all their money on this hobby, going to a point of exceeding the payload limits of the cem60 would be prohibitive in cost.
  2. cotak


    Sure. It's also why i put the astrobin link cause all the kit and exposure is detailed in the technical card. This was 39 frames of 300s on a edgehd 8. I was using a Qhy163C at -10C, and the default DSO gain and offsets setting. Was those the details you wanted?
  3. cotak


    http://www.astrobin.com/411502/ Love emission nebs, doesn't take ages to get usable data.
  4. In this case it is the difference between APP and DSS+startools. Which is why I wouldn't recommend anyone use ST today. Otherwise it's the same camera and LP filter.
  5. http://www.astrobin.com/411386/?nc=user New one above. Old one below with supernova 2017eaw. http://www.astrobin.com/360954/?nc=user
  6. Update. Was chasing ghosts a bit. And I think it did harm as stars were slightly every so elongated. It seems there's something weird about how PHD handles frames downloaded at a slower cadence than your guide exposure settings (say due to a USB2 guide cam). Let me demonstrate with some PHD2 results... Oh no! SAW TOOTH (bad subframe setting resulting in almost 6 second cadence vs 500ms exposures due to every other frame being corrupted + some extra delays): But wait... using correct subframe size not to cause weird frames to be dropped every other frame (700ms cadence on 500ms exposure): Back on CN there was a gent who struggled with his CEM60EC seeing saw tooth patterns unless he used very specific exposures and settings. I wonder if his issue was similar to mine. Now with correct subframe I can get 2 second guide exposures with 75 aggression and 0.6 min-mo (works out to about 0.5" minmo). However, 4 second 75 agg and 0.6 min-mo still seems to get better guide results. One important thing is that cadence thing resulted in higher measurement of the so called SDE, but once the cadence was faster that measurement dropped it actually disappeared completely in PHDlog viewer. So that's interesting. I wonder if the old SDE complaints were in some parts due to bad PHD2 vs cadence behavior?
  7. When the wife complains, yes there is some I guess annoyance. Regret? Not making it bigger. Although again the wife was already only just ok with the idea. And giant drawer sliders that were easily available and reasonably priced can only carry about 400lb a pair. With snow loads potential can't go too big. Now if I had gotten some industrial stuff could have used similar design and built a 10x10 :). But then a regular ROR would've been more cost effective vs 1k plus per pair of sliders.
  8. Used mesu is a mythical creature over here in Canada. So few owners likely wouldn't be much cheaper. Thanks to our crazy shipping costs.
  9. I don't think think there is anything wrong with using services like itelescope. There are uses for services like them outside of amateur imagers who are out for a picture. Schools for examples could use a service like that and it would be more cost effective than having a scope on site. And not everyone has local folks who can do out reach. And of course kids can't all stay up late. Another thing is if your situation doesn't allow you to travel for imaging, you can still get snaps of the southern skies.
  10. He goes to larger image scale when he's doing DSO. One of the secrets to DSO is keeping your image scale ambition in check.
  11. Led lights are worrying but I have also noticed they tend to be better designed not to splash so much light around.
  12. A while back I found this astrobin https://www.astrobin.com/users/sky-watcher/ Now he's rocking a 10" steel Quattro. Not that everyone will be able to do this successfully but it shows what can be done by some.
  13. The color balance is quite easy to achieve with the right app, and in this case APP (astro pixel processor) was how I managed to get better colors out of my images. And it was as easy as drawing a few boxes to select stars to calibrated against and moving a few sliders to set the correct green v magenta balance. As for noise, well each person's preference is different but I find it best not to dwell too long on it. Most of the time no one views the images at full size. If noise really bugs you I find printing really dials down your ability to see the noise
  14. The RC scopes out there are a bit hit and miss when it comes to collimation. A edgehd 8 will likely fit your needs quite well and you can also do planetary nebulae as well. I shoot only OSC you can see my galaxies etc here: http://www.astrobin.com/users/gotak/ I am located at the edge of Toronto so LP while better than downtown is a constant problem. I use a LP filter to cut the sodium lights but locally more street lights are moving to LEDs which might be a problem. There could be some use of narrowband for galaxies in the form of highlighting Ha regions but I find my cooled CMOS catches the Ha sufficiently well to show them up.
  15. Luckily for me one of my neighbor works from home everyday. While the ones backing up to my lot is a big family and the grand parents are always working in their yard. Still it's north of 5000 GBP in the dodgy looking shed I rationalize it by saying well... it would be an opportunity to get approval for an upgrade! Still would suck but that's the silver lining.
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