Quote:
Originally Posted by bmitchell82
I think you already covered what the difference is though bert with the star colours. Your refractor is a faster scope and the photons are landing on less pixels this doesn't diminish the amount of photons landing, and with the vixen those photons are spread out over more of the sensor due to the focal length hence you get the benefit of seeing the lovely colours and rainbow diffraction spikes.
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I think you just hit the nail on the head Brendan. I didnt think that the f-ratio couldnt be responsible for all the colour loss. The kaf 4020 has a pretty good well depth, around 34000e from memory.