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Stub Mandrel

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Everything posted by Stub Mandrel

  1. I put a quick process in the 130P-DS thread, but I've done a lot more work on this now:
  2. And like magic, here is the manual: 450D Manual Download
  3. In principle, it out to be reasonably simple to implement RA-only guiding. With good polar alignment 60 second exposures with a ~60" fl should be achievable. That could be fun!
  4. I added some blue data to my HSO image to bring out the reflection component of this nebula.
  5. The S/W coma corrector is designed to give the correct performance when the flange (i.e. the flat surface at the bottom of the 48mm is exactly 55mm from the sensor. This works well with custom M48 to Nikon/Canon fit adaptors. What you probably need is to discard the T-mount nosepiece which is too long to use and instead use suitable adaptors between the CC and the body of the camera. QSI can probably tell you what to use. This is how I use mine with ZWO kit: M48 - M42 adaptor, followed by various combinations of various M42 spacing rings and my filter wheel to make up a about 5
  6. I've just upgraded to version 1.9, a long process with my cronky broadband and was a bit disappointed to find it just hangs when I try to import FITs. Rather than going through it all again to install the beta, I think I will wait until the next release before using the stacking as it seems a bit short on options compared to DSS at the moment. If stacking can be refined, FITs added and a direct paste only into selected channels (the various workarounds are infuriatingly non-intuitive compared to other imaging packages) it will certainly replace photoshop and maybe DSS for me, but it
  7. A few versions here: https://www.thingiverse.com/search?q=footprint+moon&type=things&sort=relevant The original: https://www.thingiverse.com/thing:266725 Note it is Buzz Aldrin's footprint although some people claim it's Neil Armstrong's
  8. The Revelation Astro ED Barlow has an excellent price/performance ratio if you can find one.
  9. I would try filleting the inside sharp corners at either side and make the top part larger for increased stability.
  10. Circular banding usually means stretching at too low a bit depth. Are you using JPEGs instead of RAW for your images or flats?
  11. When I have moved I will get a food drier to use as a filament drier.
  12. Bear in mind the ED72 will need a flattener as well so if used with the SW flattener the relative lengths remain the same. I have no trouble imaging small, faint DSOs at F8, personally I don't find that aperture makes as huge a difference as I would expect, but it's affected a lot by other aspects of your setup too. <edit> I should make it clear the primary reason for a 'reducer' is its role as a field flattener and improving star shapes - changes in focal length are a 'side effect'.
  13. It's highly controversial but as a general principle involute gears of any size should be better than traditional clock gears. Actual size really chiefly affects power transfer capacity, friction should not be a big issue with well-formed involute gears - although you could test this.
  14. I never got the hang of startools or pixinsight. I have an aversion to packages with non-standard interfaces.
  15. ED72 is a much shorter focal length, making the ED80 more of an all-rounder. I suggest using the field of view simulators in Stellarium to look at how they suit different targets. Bear in mind though that if you go for a dedicated astro camera in future it will probably have a smaller sensor, especially if you want to stick with 1.25" filters I have a scope made with the lens from the obsolete ED66 that is superb as a wide field scope and is same focal length as the ED72 (400mm) there are some hints the ED72 may not be quite as sharp being a faster scope than ED80/ED66, but personall
  16. I think taking a step at a time is sensible, I feel that in many ways it makes the journey more rewarding. But I would go straight to a scope that will serve your needs long term. The ED80 should tack for a minute or longer if you have good PA and the mount is well adjusted. The step to guiding is relatively cheap if you already have a suitable laptop, so you pr4obably won't take too long before moving forwards.
  17. I didn't expect much last night, it took ages for the sky to clear, the moon was up and there was always thin cloud to take the edge of the images. Plus it was my first try with the Svbony 105 as a guide camera - although it worked well poor transparency and affected guiding, luckily not too critical with the 130P-DS being fairly short f/l. Even so I am pleased with how the Flaming Star turned out in narrowband - no Oiii though, but the layer did make the blue stars come out blue! Just over an hour of 5 minute exposures for Ha and Sii, about 45 minutes for Oiii.
  18. I've had a brilliant idea... I'll just keep PS2 for combining images then edit them in something else...
  19. That would let you double the pinion tooth counts and get a better form.
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