A Japanese classic: Kiron 105 f/2.8 Macro ...
... With a Pentax-KA mount, allowing the control of the diaphragm through the camera body dial and full "Av" exposure mode ...
Manufactured by the Tokio based firm Kino Precision (who also manufactured other excellent lenses branded either Kiron or Vivitar) during the early 1980s, this macro lens is able to reach a 1:1 reproduction ratio at the focusing distance of 35cm. It was sold also under the Vivitar (Vivitar 105 f/2.5 Macro) or the Lester A. Dine (Lester A. Dine 105 f/2.8 Dental) brands.
The lens is very well built, with a full metal barrel and a built-in collapsible hood. The very long focusing thread, requiring about 1.80 turns to focus from infinity to the minimum distance, allows for a very precise focusing. The 8-blades diaphragm spans from f/2.8 to f/32 in half stops increments (but my camera is able to control it in 1/3 f/stop steps).
At "normal" focusing distances (about 1m), the lens performs really well, showing a nice bokeh:
At closeups, the performances are outstanding:
But it is better to look at the full resolution images in my Flickr set, to really appreciate the performances of this lens.
- Very well built, you can almost feel the meaning of the term "precision" when focusing.
- Outstanding sharpness and realistic color rendering (not saturated as the Fujinon 55/3.5).
- A bit soft wide open, its performances raise starting at f/4.
- Nice bokeh.
- Not really lightweight, 645g with a P/KA mount.
- The camera + lens combo is quickly unbalanced when close focusing. Maybe a tripod mount on the lens would have been nice.
Time to start a fight for the Kiron 24/2 and the Kiron 28/2 ?