On Apr 4, 2009, at 2:37 PM, Cotty wrote:

The very first time I ever used a legacy K mount manual focus lens on a
modern Pentax DSLR, it worked perfectly.

The lens had no aperture lever.

Simplicity is best.

Your modified K mount lens works as if it were an M42 thread mount lens, which meter perfectly in both AV and manual modes, since you're manually controlling the iris. It's the funky semi-automatic stopdown metering stuff that doesn't quite work correctly.

Godfrey

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