Quote:
Originally Posted by Stefan Buda
I need to make a camera adapter to mount a QSI683 on a CDK250 but the information I have does not make sense to me.
Can someone please explain to me how a filter or a window makes the required adapter shorter? Please read the small print about the back focus being reduced by the thickness of the glass/3.
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Stefan,
I recall getting totally lost on this when I needed an adaptor. A glass filter will extend the focus point 1/3 of the filter width further away from the objective or mirror. It effectively extends the focal length, so you would need to increase the adapter length.
Paul