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Distances
Atmos
The correct distance of the qhy9m is 17.3mm and you have to add the back focus of the filter wheel also, which measures 20.6mm so a total of 38mm
The WO website suggests the distance required is 73.5mm for the WO P-flat 4 and the WO flt110.
Hence 73.5mm - 38mm is close to a 35mm spacer required.
The question is still un answered though
"Is the total distance of 73.5 mm from the end of the p-flat 4 to the CCD face or is it the variable setting on the P flat 4?
AS for the thinkness of the filters themselves, not to sure about that one...
Regards Paul
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