The projector lens arrived today, and as luck would have it the 3rd 1/4 moon was out in the late afternoon for an infinity focus test.
I could barely stretch my arms far enough to reach focuswuth the beast, but It looked good through my shakey hands, anyway. It looked to me like a 3x magnification, so I believe it is the 18" focal length.
I guess my first order of business is to mock up some heavy shipping tubes or pvc to dial the focus in.
If it doesn't work well as a camera lens, It will end up as a wide field telescope.
Any ideas for source for a yellow filter?
I have a strong feeling that it will not focus violet correctly