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coatesg last won the day on May 11

coatesg had the most liked content!

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About coatesg

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  1. coatesg

    DIY newt with raspberry pi and camera

    I reckon this may work nicely - shoot the video with raspivid (with as little compression as possible), and then take the video off to be processed with something like Autostakkert. You might find a ZWO gives a slightly better quality stream, but if you designed the scope so it could take either (eg managed to get a 1.25" adapter for the pi cam) then it wouldn't matter
  2. coatesg

    DIY newt with raspberry pi and camera

    Interesting project! Assume you're thinking about lunar/planetary here? The max exposure of the pi cam is quite small (6sec from memory?) and I don't suppose the read noise is that low - you may struggle with deepsky.
  3. Throwing storage at it is one option, but having a massive storage drive also means having a massive backup drive. I suppose 6TB would give space for probably enough for a while, but still a bit of a cost. I'd be interested if there is a way of using part stacks and adding without having to go right back to the individual subs, though struggling to see how pixel rejection would work here.
  4. Not quite sure what to put in the title here! I've been thinking about my future possible approaches to deep-sky imaging, especially looking at Emil Kraaikamp's approach in taking thousands of 1 sec images. The datasets this will produce are obviously huge - a single frame from my QHY163M is ~31.2MB in size. Even at 5 sec subs, the volumes of data are 22+GB/hr. Now, that's fine in theory to process (though it'll take a *long* time to chew through them, even on a 8-core i7!) - sufficient diskspace is practical, and I'd scrub the unreduced files once happy anyhow. However - long term storage is an issue. I couldn't keep all the subs here, even with poor UK weather, you're potentially looking at tens of terabytes of data in relatively short term, worse when backing it all up. Is there a feasible approach to keeping only stacked, reduced data (which is obviously much smaller) whereby you can still add to the data at a later point in time? I was thinking along the lines of: Take x hrs - save reduced, stacked data as a single linear frame. Later on (possibly years later!), take another y hrs of images - somehow combine with the x hrs before? (and repeat as needed) Could this be achieved and still allowing relevant pixel rejection, weightings, noise reduction, etc? Anyone have a PI workflow that allows this? I guess the same approach applies to standard CCD data, though the data savings are orders of magnitude less... Thanks!
  5. coatesg

    Software for mount exercises...

    Yes - that's true. I am fairly sure I've done ASCOM from python via the win32com module before, but going via pyserial may work too. I can go via the UDP interface to Gemini 2 as it's not actually connected directly to the PC that controls it. Though, given I have a G1 and a G2, ASCOM at least provides a consistent interface.
  6. coatesg

    Analogue film imaging

    Oh yes - for daytime/portrait, Fuji was the better film. It just didn't work at night for me!
  7. coatesg

    Software for mount exercises...

    Thanks. My alternative plan would be to script with python and Ascom - would be nice to find out the original software though. May have been driving an ASA mount, but can't be sure...
  8. coatesg

    Analogue film imaging

    +1 for Kodak slide - Ektachrome or Panther (pushed twice). Always found Fuji films too green/blue - Kodak film much more neutral.
  9. My suspicion is the cable as well - though it doesn't flex (zip ties along the trusses, pc on scope). RAM is definitely OK- have checked this with taskman.
  10. A couple of years back at IAS, there was a stall with a scope+mount in a sample rolloff obs doing continuous "exercises" (ie it was doing a series of slews one after the other all around the sky). Fairly sure there was a display on screen of the positions/track the mount was following round the sky. I'm after something similar for some mount testing (it needs to drive a Gemini unit via ASCOM) - anyone got any idea what the software could have been? (I suppose I could script something similar if needed, but if there's a software package available to do it, that sounds like a lot less trouble...) Cheers
  11. coatesg

    Ou4 / Sh2-129 Help Needed

    You'll find it nearly impossible to get OU4 with a modded DSLR I think. You need to image in narrowband (O[III]) to be able to get the squid. Sh2-129 is also huge - in its entirety, it'll fit in the FoV of a 200mm lens - it's about 3-4 degrees wide. Likely here you've got a small part of the bat, but it'd be a big mosaic for the lot.
  12. coatesg

    Pic du Midi Observatory, Pyrenees

    Yup - prepare for anything! I won't be descending, so hopefully it'll just be a case of having something in case of rain/wind for the climb, and the rest of the clan will be somewhere nearby in a car anyhow.
  13. coatesg

    Offsetting OTA in fork mount to balance

    Assuming everything is orthogonal, nothing I think (consider two scopes on side by side plates, or scopes mounted piggyback).
  14. coatesg

    Pic du Midi Observatory, Pyrenees

    We're (me, wife, kids) planning on visiting in early August. Looking forward to it! Though I'm going to try to get there the hard way (cycling Col du Tourmalet first, before the telepherique from Mongie....)
  15. coatesg

    Heads up " Sky at Night " Sunday

    This was like a proper trip back in time for me - most of the shooting was at the IoA in Cambridge where I studied. Amazing science in Gaia - really great stuff, would make a fascinating longer programme later down the road when the ongoing analysis all comes in.

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