Quote:
Originally Posted by ericwbenson
As you slew lower in altitude things go pear shape literally, star dispersion increases making then look like little rainbows (try it with a OSC camera), the dispersion axis vertically aligned, this is really obvious at altitude below 30ish degrees. What becomes difficult to judge is the relative contribution of dispersion compared with OTA misalignment, and how much you're willing to put up with.
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Would have thought chucking a narrowband filter in the train would test this theory pretty thoroughly. If it is an effect where the colours are being smeared at low altitudes then the easyest way to test that would be to filter all but a small range of the colours out.
Get your narrowest filter and take an image low on the horizon, any elongation in that image has to be from the scope.