I recently picked up this Dynascope 4. The gentleman selling it said it belonged to his late father, who was an educator and rescued it from a school when it was marked for disposal.
The scope itself is in great shape. I cleaned the secondary, and aligned the primary with it (the secondary isn't adjustable), and quick lunar and planetary views seem pretty good in admittedly hazy summer nighttime conditions in the city. The tube is made of some sort of resin-impregnated cardboard, and the focuser thankfully takes 1.25" eyepieces. I have no idea how old it is. I was hoping it might have been one of the 50s/60s Bakelite tube models. The OTA has a bolt on it to attach to the older-style fixed-point mounts, so this might not have been the mount it originally came with.
It was probably stored without a dustcap for many years though, and while the primary looks pretty good, the tube innards are pretty dusty. If I eventually try to have a crack at removing the primary mirror to clean it and dust out the tube, how would you suggest I do it? There is no obvious mounting hardware for the mirror cell. My first instinct is to use a rubber strap wrench to try to twist it off the tube. Would this be a good idea? Thanks in advance!
Edited by ktran, 02 August 2018 - 11:22 AM.