Richard wrote:
>The sample images look indeed very contrasty, is this mirror lens realy
>this good or is this the result of using Velvia and digital enhancement?
>Did you compare it also agains Zuikos?
I believe, that the lens is this good. The photo is not filtered or
digitally altered in any way. But of course, pictures on Sensia 100 or
Elite 100 are less contrasty. So you can say, the lens has a capacity to
produce this contrast on the contrasty Velvia film. I have no Zuiko lens in
this focal lenght range. My longest Zuiko is 200mm 1:4 (excellent lens),
then I have put out the 300mm one time (it was excellent). With 500mm, I
have one time put out the Tokina AT-X 150-500mm 1:5,6 lens. This is a fine
lens, too, but with 500mm, the contrast was not absolutely greater as with
the Rubinar.
>Has the lens realy an aperture of 5,6 or this an T(ransmission) value of
>5,6? The meter inside an OM wouldn´t mind, they just meter the effective
>entering light at open at full open aperture regardless of the aperture
>value.
I compared the resulting exposure times of the Rubinar and the Tokina AT-X
150-500mm at 1:5,6 and 500mm. The time was circa 1/10 times longer with the
Rubinar, which may be a result of the lower light transmission of mirror
lenses.
So the effective aperture is maybe (say) 1:5,7 - 1:5,8.
>Did you get filter with the lens, are they for the (big) front thread or
>of the smaller rear mount variety?
They deliver three (or four ? ) 105mm diameter filter with this lens. They
are not coated, but the thread is metric and you can use any 105 x 1 mm
filter. I use never filter, so it was no problem for me.
>Is there a lens shade? I once tested on 300mm mirror lense, which did
>benefit from an (selfbuild) lensshade.
The lens comes with a metal lens shade, which almost doubles the overal
length of the lens. I use allways lensshades, first as mechanical
protection for the front element, because I use no filter (except at the
sea), and second I have made the experience, that especially with the
Pentacon six lenses from the former DDR a lens shade is very important.
Some people say, a lens shade is more important than multi coating for
optimal contrast and colours (not only in back light conditions, but in
general).
Matthias Wilke
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