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Old 11-06-2009, 06:41 PM
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Bassnut (Fred)
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Join Date: Nov 2006
Location: Torquay
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M8,HaRGB-RGB comparison on a 40D

Hi Guys

This was interesting.
I processed 2 pics, one straight RGB and a second HaRGB (Ha as lumanance).

Taken on an LX200R OTA, G11 and EOS40D DSLR camera, with INCR (no other dark processing, or flats)

http://fredsastro.googlepages.com/temp2

Ha (clip in 15nm) is some 50 mins, 10 off 5 min subs, and RGB 80 mins 16 off 5 min subs.

Im of two minds on which is more pleasing, the RGB is smoother, but the Ha as Lum has more detail and more noise. Stars are bigger in the RGB, as excpected.

I found RGB easy to process, and am suprised at the result (its been a while since I used a DSLR, my ST10 is crook and away for fixing), but the Ha needed lots of stretching and noise reduction, I suspect more data is required.

Useing the 40D was a pleasure with live focus, but I didnt use focus max with it (been wondering if that is possible, cant see why not, must try that).

Ha results are problematic, as expected with a DSLR, but with lots of exposure time I think its well worth the investment.

The higher res of the 40D at long FLs over the ST10 is not so obvious though, although the extra FOV is handy (the pics were croped).

DSLRs have come a long way, makes the transition from a DSLR to CCD less urgent methinks after this little trial (for bight objects at least).
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