19 Aug
2011
19 Aug
'11
12:51 p.m.
It would be fun and informative to one night conduct side-by-side comparsions between an 80mm ED and 80mm triplet, of like focal lengths. In addition to admittedly subjective color and resolution tests, I could probably rig up my lux meter to measure throughput, on a bright object at least. 4 air-to-glass surfaces vs. 6 should have a measureable effect on throughput, given equal anti-reflection coatings. That's my biggest gripe with small refractors. The image is so dim compared to what I am used to seeing in larger apertures, except at low powers, where they truly excell. Of course used at low powers, uncorrected color is not the issue that it is at higher magnifications, visually at least.