The contact that transmits lens data is independent of the "A" contact.. Otherwise I would be able to manually set the SR focal length on the K10D.
Adding the 1.7x AF adapter to any FA lens tricks the camera though. Dave On 12/13/06, Perry Pellechia <[EMAIL PROTECTED]> wrote: > I never not tried these type of combinations so I am not sure I can > help. However, can't you take the lens off the "A" position and fool > the camera to not use the focal distance? > > > On 12/13/06, Jostein Øksne <[EMAIL PROTECTED]> wrote: > > Ops, sorry. > > My question wasn't very well phrased. > > With just one lens reversed (eg. with bellows), it doesn't matter what > > kind of lens you use, since there's no communciation between the > > camera and lens. > > > > My query was for using two lenses. For example a 200mm and a reversed > > 50mm stacked via the filter rings. Since the stacking reduce the > > working distance, there is potentially a problem when the straight > > mounted lens communicate focal distance to the camera. If this info is > > used in calculation of flash output, that is. > > > > In my experience, this problem is real, but it is only based on > > experience with one lens, the FA 100/2.8 macro. When using this lens > > with eg. a 50mm reversed, I get massive overexposure with TTL flash. > > When I use a A*200/4 and a reversed lens, it's OK. As Perry describes, > > there's still a consistent tendency to overexposure, but it is > > manageable. > > > > So my question is basically if this is an issue with my FA100/28 > > macro, or if it's a general "feature" of all FA lenses...:-) > > > > Cheers, > > Jostein -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
