|
Peter - it's actually a variable reducer, depending on how far it is placed from the imaging plane.
There is a PDF on the Astro-Physics website that gives you the calculations to work out what the reduction should be. The "standard" AP adapter should give you about 0.67x reduction, but it can be varied. I should get about 0.75x reduction with the custom adapter I have bought.
More reduction decreases the size of the illuminated field. I went for a larger illuminated area to partially illuminate the OAG on my CCD camera.
DT
|