Cosina
Voigtländer Lanthar 90/3.5 SLII for Pentax KA



Specs:
Elements - Groups 6 - 5
Number of Blades 9
Min. focus Distance 0,5 m (0,32 m with close-up lens, = ca. 1:2)
Max. diameter 48 mm
Length 63 mm
Weight 320 g
Filter diameter 52 mm
Price 419 Euro (2010)

The focus throw is about 260 degrees!


Optical formula:
Gauss type. Similar to the Pentax DA 70/2.4 and the 50/1.7 lenses.


NB! My first copy suffered from a sticky aperture.
Please test your copy accordingly.
I noticed it, when shots stopped down were sometimes, more often than not, overexposed.
Here is a little video, that shows the behavior: Video.

What's in the box?








With close-up lens:
The lens hood consists of two pieces, a ring and a small tube. To attach the close-up lens the tube has to be removed.



Maximum extension: Great manual focus feeling!


Minimum extension:




First test images:

With close-up lens:
The magnification reaches about 1:2, half life-size.
f16, 1/125 s, ISO 100


100% crop:


Elmar: f3.5, 1/100 s, ISO 1250




Some testshots: all images with the K20D

Fire bug: f5.6, 1/100 s, ISO 400


f3.5, 1/100 s, ISO 250


I tried to get a flying dragon-fly, but that is very difficult:
f3.5, 1/500 s, ISO 100


It is easier, when they don't move. This one has a smashed eye.
f8, 1/180 s, ISO 100, built-in flash


100% crop:


f8, 1/100 s, ISO 320


f8, 1/100 s, ISO 800


f3.5, 1/100 s, ISO 100


f8, 1/100 s, ISO 100


f3.5, 1/100 s, ISO 800, with close-up lens


f8, 1/100 s, ISO 1250, with close-up lens



Infinity:
f3.5, 1/1250 s, ISO 100


100% crop: very good!





Verdict:
Very good lens, recommended!

Some more images ...



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