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About geoscope

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    computer software, beekeeping, folk music, video production
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    Blakedown, England

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  1. As in the previous post, I'd be interested to see how you get 40sec exposures - I've used picams a lot and could only get 5secs.
  2. OK, a little clearer. But the Canon 100D has an ISO range of 100 to 25,600. That would imply it's capable of better performance than the 1100D with a range of 100 to 6400. As they both use the APSC chip it seems the 100D simply has a better amplification system for getting better S/N (?) And the meaningfullness of it all seems to rest on whether ISO100 is an absolute baseline defining the ability of any camera to capture photons. Is it ? I don't know, maybe someone does. I don't seem to see that basic phonton sensitivity defined anywhere.
  3. Looking at getting a s/h Canon for DSO AP work, stacking 15sec shots, so looking for good sensitivity. I notice in the Wiki comparison chart that the 1100D has a max ISO of 6400, the 1200D twice that. Will the 1200D really offer twice the sensitivity ? Or is it the same chip and they've simply re-defined what they mean by max ISO ?! https://en.wikipedia.org/wiki/Comparison_of_Canon_EOS_digital_cameras
  4. Thanks everyone for the useful feedback. Lots to pursue now and I'm feeling a bit more optimistic. I think I'll be heading for a Canon 1100 or 1200. The APT s/w looks good value, also Backyard EOS. Lots to go at now, inputs much appreciated. Geo
  5. I'm want to get into AP iamging DSOs but have focusing issues - nothing new there I guess. My basic question is this: Is it possible to use a DSLR and USB link to display live images on a Windows PC (or Android Tablet) with sufficient resolution to use a Bahtinov grating for focusing? If so, which DSLR have people used in this way? And which software? I have been trying without success to use my Sony A300 DSLR but the built-in LCD display is far too low resolution to see the fringes from a Bahtinov grating. The grating works great with an eyepiece so nothing wrong with the
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