Right, time for an update: a story of equal parts embarassment and success.
Ready? I'm not, but here goes anyway.
I wrote a lengthy post complaining and moaning about my parfocality issues and lack of image clarity with the current photography tube setup.
Turns out, it was my lack of experience and knowledge doing all the damage.
Just a little background. My current photography tube setup is this: an OEM IOR tube from the "treasure chest" coupled to an Exakta mount, converted to Fuji X. The tube is designed to hold a projection eyepiece. Here:
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My current visual setup is this. Note the analyzer below the bino head prism.
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My plan was to photograph some cross-polarized crystals. So, i needed the analyzer. So, i mounted the camera and tube assembly in place of the bino head, on the prism. Made plenty of sense in my head.
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Turns out, the correct setup is this:
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I couldn't get it parfocal because the optical path was too long. It is finally (almost) parfocal, and sharp enough, if i can get the focus right. Buuut, i can't use the OEM analyzer, so i had to improvise placing a polarizer in the holder. Meh. Not nice, IOR, not nice...
A test shot, taken through a CZJ 16x APO and a CPL 10x ocular used for projection, in the tube.
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As usual, point-by-point:
@Hobbyst46 - there are two wide field 5x eyepieces in the "treasure chest", but - more in the next post, not enough pictures for now. On the camera-on-bino-head, the camera i am using, a Fujifilm x-e2s mirrorless, is not so light as you would expect, and i am wary about stability issues. It would be a lot more confortable for me to avoid switching back-and-forth, that is very true.
Thanks for the link, a lot of useful info!
@Microbob - thank you for the kind words. I will write another post detailing a bit about the treasure chest and the microscope it came from, it is quite interesting.
Will follow up with some details and info on the IOR research microscope, what i managed to piece together anyway. If this is not the correct forum for this info, i'll gladly accept being pointed in the right direction.