The 1st one is cloud filter, to eliminate any adverse effects cloud might have during imaging. The 2nd is a resolution improver, effectively increaseing the resolution of any camera attached by 10, ie a webcam will have the same resolution as an ST11k. And the last is is a photon mutiplier, which increases the effective apature of a scope by 8, so a 3" refractor behaves like a 24" RC.
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