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The finder got a new mounting arrangement. The old one was quite corroded despite being anodized.
Back in the days when I made this OTA, cutting edge planetary imaging was done around a focal length of about 10m because the webcams used back then had larger pixels than today's planetary cameras. That made it very difficult to move from one planet to another as the field of view on the computer monitor was less than 2 arc minutes.
To help with that, I wanted a finder with enough magnification to make this easier but to also be compact. In the end I made my own achromatic doublet of 48mm clear aperture and 250mm focal length. That, combined with a 10mm eyepiece equipped with a custom graticule, worked quite well.
Only one more problem to be solved. On nights with hi humidity, I was getting so much dew on the objective lens that I had to use tissues to wipe it to be able to see anything through it. So a heater needs to be made.
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