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RAC

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Everything posted by RAC

  1. Here's an image of Ganymede for those interested. Ganymede 3/3/2017 by Raymond Collecutt, on Flickr
  2. I'm using the Onstep system. It's free apart from the hardware. It's a stepper based system that uses either an Arduino mega 2560 or a Teensy 3.2, the Teensy is way better! The system uses bluetooth and has a good app as well as being able to use it with just about any software that can use the LX200 protocol.
  3. Hi, It's been a long time since the last time I posted anything here. I was mostly into deep sky shots back then but planetary imaging has taken over. I've been making mirrors and scopes over the last two years with a goal of making a good big planetary scope ready for Mars in 2018. That scope may end up being my current 20" f3.8 tracking dob or it could be a 25" or 30" version if get around to it. For now the 20" is doing well. So here's a few shots. equipment: 20" f3.8 traking dob, ASI224MC camera, ZWO ADC, 5 x powermate. 5/2/2017 Derotated Jupiter by Raymond Collecutt, on Flickr 3/3/2017 Jupiter 2017-03-03-1337 by Raymond Collecutt, on Flickr
  4. You can put it on a Canon camera, set the aperture to what you want then hit the DOF preview button and then take the lens off the camera with the button held on. If you want to stop it down without causing diffraction spikes then get a lens cap and lathe a hole in it the right size. My 200mm f2.8L is really good with only blue having a little problem around the corners. I made an external aperture mask using a lens cap. I would only run it stopped down to f3.5 when using a blue filter.
  5. Well that is very interesting, the color one is horrible to look at compared to the mono one. The color one looks brighter but there is a lot better data in the mono image and way less noise?
  6. I can fully recommend a ZWO ASI224MC and an ADC also from ZWO. And here's a 3d image of Mars done with both of those with my 20" f3.8 dob + a 5 X powermate.
  7. Wow looking really nice. I really like the carbon secondary holder, similar to my ones I make. Have you thought about motorizing the scope. I'm doing that atm with my 20" dob. I'm going down the Onstep road as any other option just costs way too much.
  8. I only even removed the IR filter with my 60D and that worked fine but I ended up selling the camera before really using it. The only camera I ever made mono was the 1000d in the first post of this thread.
  9. By the time you stack the video or images they will disappear. I won't worry about them.
  10. Here's a shot of my setup. It's as simple as having half the led cut off with the knife edge and looking at the return beam below the led. There isn't a lot in it between pin holes, slits and slit less IMO.
  11. Sounds good but what about finding a motor with a reduction gearbox. You will find figuring sooooooo much more easy with it turning.
  12. Yes I hope there are no more out there like mine. What I find amazing is how well it performed in that state! To think it could take Mars pics like this blows my mind. Mars, Blue - Green - Red - RGB by Raymond Collecutt, on Flickr
  13. Those star test pics are stacked images done with a planetary camera. Making a small mirror is nothing like making the mirror you did.
  14. I was talking about this quote from John about something he noticed on Gordon Waite's youtube channel. "I've noticed that GW on youtube sometimes has a hole in the back of mirrors. I had wondered if this was to get it central on the table but maybe it's for location in the scope."
  15. I think the hole in the back was a left over from the quartz blank as it was to be used in the semiconductor industry. I think they where seconds but perfectly ok for mirrors.
  16. Yeah I think a big problem is the amount of orders. One man can only do so much. Doing it by hand it took me two full days so if you think about that then these mirrors are too cheap if you include the blank and the rest of the grinding and polishing, all I did was take it back to a sphere and figure it from there, I couldn't just figure it from where it was as there was a turned edge I wanted to fix.
  17. It's just a pyrex conical mirror.
  18. Here's a little update on this. A few star test images and an image of the Orion nebula in HA as a test. Orion ha test by Raymond Collecutt, on Flickr
  19. Looks good, the seeing in the last frames look really good. Re the asi224? I have one but have not used it yet, when you use the IR pass filter do you capture it with debayer turned on?
  20. That mirror looks really nice. Should be good.
  21. Yep and that's what that slider is so good for in Figure XP.
  22. If the far outside zone is getting worse then the only way to fix it other than starting again is to lower the zones inside it and that can mean a small and sometimes very small lap. I like to work the mirror keeping a very close eye on the last zones reading, basically not over correcting the middle but taking the surface down evenly where needed by paying very close attention to the Figure XP tests as I go. I don't like needing to use small laps at the end.
  23. Any updates on the mirror?
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