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If you don't want to take pretty pictures and you want to take shots of asteroids you should probably ask the planetary imaging guys which camera.
DMK make several mono models.
So does Point Grey Research.
Lumunera are a leading brand. They make several models. $2000 would get you close to top of the line on all the above.
The Sony ICX285 chip is the best. The new Kodak A340 is also very good.
Perhaps the approach to imaging an asteroid is similar to imaging a planet where its F40 (you need a 4X powermate) and 30 frames per second ability and stack lots of images using K3CCD tools or other stacking software used in planetary imaging.
Asteroids won't show up as colour so a colour cam would be a waste and colour cams are always quite a bit less sensitive than mono cameras because of their design.
Greg.
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