What way to put focal reducer optics
This may sound like a stupid question, but here goes nothing.
I have recently taken my focal reducer's optics out of their casing several times, in the process of having my back neighbour engineer up a fitting allowing me to slide the optics inside a 2" draw tube, hence reducing the imaging train & focal length.
I didn't think to note when I took the optics out, which end was at which end of the casing. The sequence of optics and spacers I do know (hasn't changed).
How can I tell if I am putting the optics in the right way around?
I suspected I'd be able to do it by looking at which way around results in magnification vs reduction. However placing the optics a fixed distance from a metal ruler results in undistinguishable difference in magnification (odd?).
I might end up having to install the optics, take photo's, and then try them reversed. But that's all a bit of a pain really and would take a little while.
Roger.
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