On Thu, Apr 05, 2001 at 02:07:12PM +0200, Globtroter wrote:
> Hi, again!
> Your test below is completely correct,
> I agree,
> but it is not the case I meant.
>
> Please simply follow that:
> 1. take the lens and put it on
> a camera,
> 2. open it fully and direct it on the plain wall
> (you are looking through 3,5 hole),
> 3. close the diaphragm one stop - THEN
> the viewfinder comes dimmer (you are looking
> through 4,5 hole),
> 4. close the diaphragm next stop - THEN
> the viewfinder stays dimm like it has been so far
> (you are still looking through 4,5 hole),
>
> It means that the lens is difficult for focussing
> because the diaphragm closes from 3,5 to 4,5
> immediately at the moment when you are turning
> the diaphragm ring from 3,5 THAT's the real disadvantage
> at the manual cameras.
Hmm, I can only speak of my 35-105, and I can`t confirm this test.
My 35-105 has a auto diaphragm mechanism which works as expected
(like on all other Zuikoo`s I own).
The viewing apperture is always the max. aperture, no matter of the position of
the diaphragm ring. Only when I zoom from 35mm to 105mm, the viewing
apperture changes from F/3.5 -> F/4.5.
Ahmm, closing the diaphragm one stop is turning teh apperture ring from F/3.5
-> 5.6,
or am I getting something wrong?
Frieder Faig
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