Keith
12-07-2007, 17:00
I was thinking about some of the more common fast lenses that we use and how random the aperture scale seems to become on them once you get below f2. They seem to lose any real fractional system and what it is, is what it is. I had a look at Wikipedia and found some scales that indicate that f1.4 is a full stop from f2.0 and the next full one stop progression is f1.0 which was the info I was seeking as I was wondering where my f1.2 Canon sat on the scale. It appears to be a third of a stop faster than f1.4
When split into thirds it progresses ... f2.0~1.8~1.6~f1.4~1.2!1.1f~f1.0 That leaves some familiar lenses that are f1.9 ... f1.7 ... f1.5 and of course the famous f0.95 of the Canon that seem reasonably common around here.
When some of the various lens manufacturers make lenses faster than f2.0 it appears they throw away the rule book and funtion becomes primary over form? :)
When split into thirds it progresses ... f2.0~1.8~1.6~f1.4~1.2!1.1f~f1.0 That leaves some familiar lenses that are f1.9 ... f1.7 ... f1.5 and of course the famous f0.95 of the Canon that seem reasonably common around here.
When some of the various lens manufacturers make lenses faster than f2.0 it appears they throw away the rule book and funtion becomes primary over form? :)