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Another optical train cured of Tilt.
Astrophotographers please note that the largest tilt errors I'm finding in this type of optical trains is coming from the filter wheel assembly.
I think the reason is that the housing of these large FW's is machined out of solid plate and the remaining "skin" on both sides is only 3mm thick. So during the CNC machining residual stresses in the material are released and when the part comes off the machining fixture it changes shape.
No easy way to overcome this (machining) problem.
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