I think you diagnosed the problem. Get a small extension ring without contacts (I have several 12mm rings) and put that between your FA lens and the camera.
The main thing about automation - it makes life easier 99.9% of the time, but if you are working in the 0.1% zone you eihter have to trick it or shut it off... :-) - MCC Jostein Øksne 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 >>>> [email protected] >>>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> 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 >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> > -- - - - - - - - - - - - - - - - - - - - - Mark Cassino Photography Kalamazoo www.markcassino.com - - - - - - - - - - - - - - - - - - - - -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
