AP 178 f/9 10" Royce Optics Dall Kirkham Conservator of Tom Back's personal TMB 100/800 (Strehl .997!) PST
Quote:detailed data on testing the C6 when using my Denk binoviewer with powerswitch set to reducer mode. This turns out to be the most severely reduced / vignetted system. With the reducer I'm operating at 0.60x the F which nets F=1100. However aperture is reduced to 118mm. And field of view is limited to about a 23-24mm field stop.
This reduced aperture results in D=118mm, Obstruction =49%, effective light gathering = 102mm
"Coffee leads men to trifle away their time, scald their chops, and spend their money, all for a little base, black, thick, nasty, bitter, stinking nauseous puddle water." ~The Women's Petition Against Coffee, 1674If it ain't broke, fix it 'til it is.
Quote:Back to the refractors... I have a 6" APO, and I am not about to cut the tube on it.