On Thu, Oct 22, 1998 at 04:53:24PM +0200, Marco wrote:
> Oil can affect, imho and asfaik, only the time needed to "open", but not to
> "close". When you shoot a camera tab forces the lens aperture to close to
> the pre-selected value; the lens cannot keep it open even if there is a lot
> of oil.
That depends on the design of the lens. In some lenses (including the Zuikos
I've had apart), the stopdown lever pushes the diaphragm actuator, but in
others, the stopdown lever simply moves something out of the way and allows
a spring to close the diaphragm. In these, oil will indeed cause the
diaphragm to be slow closing. Olympus-mount lenses have an advantage in
checking for this, since the depth-of-field preview button normally pushes
on the same spot the stopdown lever in the lens mount does, so you can check
the operation of the diaphragm without getting your fingers near the rear
element.
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