Quote:
Originally Posted by Shiraz
the OSC has much higher quantum efficiency and larger pixels than the mono, so it will be quite sensitive. The downside of the large pixels is that galaxies will be pretty small - great for nebulae though.
The mono has relatively low quantum efficiency, but the small pixels will give you much bigger galaxy images. You will just have to spend longer taking images than with the OSC to overcome the inherently low sensitivity.
You are right not to worry too much about cooling - these chips are very quiet and you will not really need to do darks for most targets.
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I think you meant the other way round Ray. The OSC is way less QE than the mono which is the case with every OSC sensor I am aware of.
Typical QE for a OSC (not sure what a 314 is, is it the Sony ICX694 chip?) is around 25% or less but mono's are usually 50% -77%.
The bottom line, OSC is good for bright nebula but not for galaxies which are dim. Dim objects in OSC will show a ton of noise which is hard to get rid of especially in the dim areas of the image.
Straight luminance images of galaxies are quite nice even without colour. They are like Ha images.
No doubt at all - mono all the way and add colour later otherwise you will be disappointed for sure.
Greg.