Originally posted by reuvens I have an LX (and a KP) and I was thinking about picking up a D-FA 100mm f/2.8 WR Macro, but it has no aperture ring. What happens if I can't adjust the aperture on the lens since it has no aperture ring? According to the manual, if I set it to A mode on the shutter speed dial it will meter and expose wide open, which is fine for my purposes. But elsewhere I've seen that it will stop down all the way to f/22, which is not what I want. Can I use this lens with the A setting on the shutter speed or am I better off getting an older 100mm with the aperture ring on it?
As others have said, the LX requires an aperture ring on the lens. However, ANY Pentax camera with a program mode or shutter preferred automatic will work. You have to have a camera body that is able to control the lens aperture. A non aperture ringed lens is effectively an A series lens that is stuck on the A setting.
There are tons of very good Pentax K, M and A lenses out there, as well as many screw mount lenses that will also work well with the LX, but the D FA 100/2.8 macro is not the droid you are looking for.
A word to the wise, the A 100/2.8 Macro is one of the best macro lenses ever made by anyone, but it suffers from sensor reflections in some situations, so while it is an excellent choice for film, it is iffy on digital. I bought the D FA 100 macro because of random reflections I got with the A lens.