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 On 12/12/06, Perry Pellechia <[EMAIL PROTECTED]> wrote: > Jostein, > I am not Mark, but I have used several lens reversed with the D and > have gotten decent TTL exposures. I have used a Vivitar 28.2.8, a > Pentax A 50/1.7 and Canon FD 50/1.8 reversed on the D. I have even > used these mounted on bellows and have managed pretty well. > > You are correct that these combinations will lead to extreme > overexposure under default conditions. However, I have found that you > can dial in enough compensation so that position/distance changes will > lead to correct TTL exposures. > > Perry, > > On 12/12/06, Jostein Øksne <[EMAIL PROTECTED]> wrote: > > Mark C., > > > > May I ask which lens combinations you have used for reversals? > > > > In my experience, the *istD TTL flash metering would give strong > > overexposure with reverse mounted lenses when the straight-mounted > > lens was an FA, but correct exposure with older lenses. > > > > Jostein > > > > > > On 12/12/06, Mark Cassino <[EMAIL PROTECTED]> wrote: > > > Bob Sullivan wrote: > > > > G, > > > > Remember TTL flash on the *ist DS bodies. > > > > Regards, Bob S. > > > > > > > I'm not sure if I'm reading your comment correctly, but that is exactly > > > why I'll be keeping the *ist-D. For some macro work I do where I need a > > > reverse mounted lens, P-TTL does not work. The older TTL and the *ist-D > > > work fine. > > > > > > Yes - its only 6 megapixels. But at extreme magnifications each pixel is > > > covering such a tiny area, it works out fine. > > > > > > - MCC > > > > > > -- > > > - - - - - - - - - - - - - - - - - - - - > > > Mark Cassino Photography > > > Kalamazoo > > > www.markcassino.com > > > - - - - - - - - - - - - - - - - - - - - > > > > > > -- > > > PDML Pentax-Discuss Mail List > > > PDML@pdml.net > > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > > > > > -- > > PDML Pentax-Discuss Mail List > > PDML@pdml.net > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > > > -- > <----------------------------------------------------> > Perry Pellechia > > Primary email: [EMAIL PROTECTED] > Alternate email: [EMAIL PROTECTED] > Home Page: http://homer.chem.sc.edu/perry > <----------------------------------------------------> > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
