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I have a Precise Parts adapter which is actually set to the correct metal back distance for an Apogee FW50 7 position filter wheel which is enroute to me.
It means that with the FLI filter wheel the spacing is 4 to 6mm off from the correct distance and it causes a small amount of trouble as a result. Hopefully corrected with the Apogee filter wheel.
There is a standard adapter for the STL11 which I also have and that gives pinpoint stars to the corner of an STL11. From memory it is 25mm.
Greg.
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