Lets not forget in this discussion of the maximum f/stop of a lens that the f/stop measurement is taken from the relationship of the entrance pupil and the focal length. The actual diameter of the front element is not part of the equation. William Robb - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
- 200 f2.5 question, how can filter ring be 77mm? Frank Wajer
- Re: 200 f2.5 question, how can filter ring be 77... Martin Trautmann
- Re: 200 f2.5 question, how can filter ring b... Antti-Pekka Virjonen
- Re: 200 f2.5 question, how can filter ring b... Knut Kampe
- Re: 200 f2.5 question, how can filter ring be 77... Tom Rittenhouse
- Re: 200 f2.5 question, how can filter ring be 77... Fred
- Re: 200 f2.5 question, how can filter ring b... William Robb
- Re: 200 f2.5 question, how can filter ri... Knut Kampe
- RE: 200 f2.5 question, how can filte... Kent Gittings
- RE: 200 f2.5 question, how can ... Mick Maguire
- RE: 200 f2.5 question, how can ... J. C. O'Connell
- Re: 200 f2.5 question, how can filter ring be 77... Anthony Farr
- Re: 200 f2.5 question, how can filter ring be 77... Rfsindg
- Re: 200 f2.5 question, how can filter ring be 77... Frank Wajer
- RE: 200 f2.5 question, how can filter ring b... Kent Gittings