Hi, with non IF I can calculate the change in field of view (FOV) when changing focus. I think the FOV is smaller as you focus closer.
I noticed that with my 24-90 lens the fov actually gets wider when focussing closer. This is an IF lens. The only explanation I have is that f gets smaller when focussing closer with IF lenses, but I don;t know how. Anyone have an equation for the f change? Frank - 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 .
