Hi All,
Long shot I know but does any one know by practical experience - or can point me in the right direction - of the 'Spacer' distance for the William Optics Field Flattener 3 from the CCD/Sensor plane?
The schematics from WO seem to indicate 56mm - I just want to confirm that is what people have practically experienced
The CCD I'm going to be using has 13mm of back focus inbuilt.
Many thanks
John