Quote:
Originally Posted by Aster
Used to have a 12.5" F6 mounted on a home made EQ mount. Consisted of 20mm welded steel plates , a couple of self aligning 75mm dia. plumber block bearings in RA. 50mm shaft for DEC. running in self lube bronze bushes with hand control slow motion. Ra was driven by a ala Texerau ribbon sector drive. After 1.5 hours I had to rewind. Deep space photography with exacta slr body, knife edge focuser, electronic control 2 buttons for RA made by a PM linesman. Offaxis guiding with spiderweb eyepiece. Star images after 45 minutes exposure on negative were pinpoints. Developed and printed on 10"x8" kodak paper and star images still pin points.
No stacking, no Photoshop etc. just the original raw image.
The Point I am trying to make is "WHERE IS THE PRECISSION" |
ummm, I dont see the term "PE" or even more important,"non periodic error", without them ,your pissing upwind
. On the other hand, if you got pin point stars with a SINGLE 45min exposure, 1/ your in the wrong job, you should be making mounts. 2/ if you can make them that good at less than $20K youd be a very rich man in a very short amount of time 3/ I would grovel in the mud, apologising profusely.
gimme PE stats