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 > > 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 > -- <----------------------------------------------------> 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
