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Tonk
Post Laureate
Reged: 08/19/04
Posts: 4346
Loc: Leeds, UK, 54N
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Re: How well does white balancing work for a mod-D
07/05/09 05:21 AM
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Humm - I just looked at Covingtons comments and note that he's comparing stuff to the Canon 20Da. This was the "astronomers" edition of the 20D. This camera had a different filter that extended further into the red end of the spectrum but didn't give you the 90%+ transmission that a full filter removal gives you. It was a compromise that still allowed daytime photography but gave you a fighting chance at nebula photography. The actual H alpha transmission was somewhere between 30% - 50% (I'll see if I can locate the wavelength transmission chart). So in reality Covington is not comparing the same things - he certainly not comparing to a "modded" camera. Yes at 30% transmission you can get reasonable H alpha recorded - but you will have to expose 3 - 4 times longer to match the signal from a modded camera.
So be aware many unmodded Canon cameras have worse H alpha transmission compared to the compromised 20Da and all will be far worse than a true modded camera. You will need to check what it really is for the model that you are choosing
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Televue 85, GM-8/Gemini, Canon 40D (unmodded), Canon 450D (modded w/Astronomiks clip-ins - UV/IR, OWB)
Coronado SM60/BF10, Baader Herschel Wedge
Leeds Sky Clock Ripon Sky Clock
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