anesh Posted May 30, 2006 Share Posted May 30, 2006 What is this lens max apperture at 50mm? Link to comment Share on other sites More sharing options...
ken munn Posted May 30, 2006 Share Posted May 30, 2006 If the maths are linear, f3.8. I'd be interested to see whether that's the case in practise, though. Link to comment Share on other sites More sharing options...
rainer_t Posted May 30, 2006 Share Posted May 30, 2006 A guy who tested the 17-70 wrote in his test (which is unfortunately offline in the meanwhile) the following maximum f-stops: 17-20mm 2.8 21-24mm 3.2 25-34mm 3.5 35-54mm 4.0 55-70mm 4.5 So the guess with f/3.8 was not very far away. Rainer Link to comment Share on other sites More sharing options...
ken munn Posted May 30, 2006 Share Posted May 30, 2006 Guess! That was Maths 101, that was! Link to comment Share on other sites More sharing options...
rainer_t Posted May 30, 2006 Share Posted May 30, 2006 Ken, I'm aware, that 3.8 = 2.8 + (4.5 - 2.8) * (50 - 17) / (70 - 17) but I doubt that situation within a lens follows linear math. That's why I called it a guess. Rainer Link to comment Share on other sites More sharing options...
jojo_ma Posted May 30, 2006 Share Posted May 30, 2006 See this at my site http://www.pbase.com/lightrules/17701785 Link to comment Share on other sites More sharing options...
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