kostas papakotas <kostaspapakotas@xxxxxxxxxxx> writes: > I was reading an article in American Rifleman of Sept 05 on optics > resolution. (How Sharp is Sharp?) and there is the statement that > Resolution depends on Objective Lens Diameter, and by a function of: > > 114.3 / Objective Lens Diameter = Resolution in arc seconds (1/60th of > a MOA) > > Which is stated that it is a simplified formula for Dawes? Limit???? > > So a 58mm lens has a resolution of 113.3 / 58 = 2 Seconds of Angle > (SOA) ( 1 arc degree = 1 MOA = 60 SOA). > > Well I know it is more complicated than this, with lens design and > coatings getting into the issue... > On the other hand high quality long zoom lenses are always BIG (read > sporting a large diameter objecyive) > > So....how critical is obj lens diameter on resolution. Amd BTW does a > larger objectve makes that much difference in light collection? Isn't this just the diffraction limit issue, stated the opposite way? -- David Dyer-Bennet, <mailto:dd-b@xxxxxxxx>, <http://www.dd-b.net/dd-b/> RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/> Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/> Dragaera/Steven Brust: <http://dragaera.info/>
