Sigma Pan Focus Lensgreenspun.com : LUSENET : Konica 35mm SLRs : One Thread
I recently bought a Konica outfit that included a Sigma Pan-Focus 135mm lens. There were no instructions, but it is apparent that the lens stops down to f64 in the Pan-Focus mode. DOF is something like 4ft-infinity when focused at 8ft!
Has anyone used one of these lenses? I presume that one way to set the exposure is to use aperture priority, i.e., to set the shutter speed to an indicated f22 (using an FS-1 for example) then resetting the shutter 3 stops slower. Is there an easier way?
-- Anonymous, January 29, 2001
That sounds like an interesting lens. I have a couple large format lenses that go to f45 or f64. Nothing more than f32 that will fit on my Konicas.
Yes, you'll be setting the lens manually, outside the parameters of the camera's metering system (f16 on earlier models, f22 on the later ones). You can use the internal meter, then adjust it mentally or you could get a good handheld meter to accomplish the same calculations.
Many lenses don't really produce their best results at their very smallest aperture settings. However, the middle apertures where they do work best, are smaller too. For example, an f2 to f22 lens might give the best results at f5.6 & f8. Meanwhile, a lens that is f3.5 to f64 might work best at f16 & f22.
I hope you have fun experimenting with that lens and let us know how it works out!
Alan Myers San Jose, Calif.
-- Anonymous, January 30, 2001