04-06-2012, 05:53 AM
I'm writing this in response to a trollish comment on another site's forum. The post was on the announced Voigtlander 17 0.95. Though many Mft users are happy with the prospect of owning one, someone made the comment that the f-stop was only so fast because the puny sensor is so small that it needs less light. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/huh.gif' class='bbc_emoticon' alt='
' /> I think an f-stop is just an f-stop and sensor sizes are not part of the equation. But maybe I'm wrong. Can 4/3 lenses be faster because the imaging circle is smaller and therefore more focused? But then why aren't point and shoot cameras ridiculously fast? And then we have really fast ff lenses. But I can't think of any super fast medium format lenses. And I also notice that rangefinder lenses tend to be faster, does the shorter flange depth help with this f-stop equation? Any experts?
' /> I think an f-stop is just an f-stop and sensor sizes are not part of the equation. But maybe I'm wrong. Can 4/3 lenses be faster because the imaging circle is smaller and therefore more focused? But then why aren't point and shoot cameras ridiculously fast? And then we have really fast ff lenses. But I can't think of any super fast medium format lenses. And I also notice that rangefinder lenses tend to be faster, does the shorter flange depth help with this f-stop equation? Any experts?