I FINALLY got to play with the modded 20D just last night. Still had problems with alignment, until I finally figured out a way that seems to work well for me, so far at least. I used the LED flashlight of my iPhone, and shone it through my polar scope. I was WAY off, which explained why my first alignment star was WAY off. Once I got that roughly fixed, alignment and calibration came much easier, and I was able to get 1:45 minute subs off the mount with my camera directly attached. Tons better than the 30-45 second subs I was getting previously. I went with a fully charged grip, but the cold sapped it pretty quickly, and so I ended up with 46 minutes worth of usable frames. It was taken with my nifty fifty, 400 ISO, f2.5. I think I am going to go up a little bit more with my aperture, as there is a lot of distortion. I'm also tempted to go a little bit more widefield with this one, say around 20-30 mm, but it means I'd have a heck of a time getting more than one night of photos, as well. I'm pleased with the results, all in all, although I'm sure there is still data to be mined within it. Unfortunately, I didn't add but 6 frames of darks. I'm willing to bet it would help immensely. In any case, the camera mod definitely took a lot of time off getting data. I have an image of Orion that I took several years ago with my 40D that has 2.5 hours worth of images ranging from 2-4 minute exposures using a mini GEM. There isn't nearly as much detail in that one.

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