The KIRON 2.8/105 macro is a very complex, purpose-designed macro lens from the mid-1980s. It is manufactured completely of metal, the focus is absolutely free from play, aperture mechanism glides on ball bearings. It had an expendable hood - also made of metal - and can be focused without additional aids up to 1:1. At full aperture (2.8) sharpness and contrast are not outstanding but rather moderate, this is completely normal for lenses of this type. But the softer image and good out-of-focus background can be of advantage with portraits. Stopped down past f/2.8 this macro lens is very sharp and brilliant, with the finest detail visible.
(by Wilhelm Zedler, nikon-foto.de)
I use this lens for about two years now, and I love it. It focuses from infinity to 1:1, is perfectly sharp and has a nice bokeh wide open. It has a slightly longer focal length than the Panagor or the Tamron SP 90/2.5, which I find very useful, and has a built-in lens hood.
(by Marcus Frey)
The Kiron (105mm/2.8) is very sharp. In a 1985 FOTO magazine review of macro lenses, it tested better than either the 105mm/2.8 micro Nikkor (manual focus), or the Tokina 90mm/2.5 macro (manual focus).
I found it (Kiron 105/2.8) to be one of (if not the) sharpest lenses I ever owned. Shots typically at F11 were incredible. I used it quite a bit and even the photo finisher who processed my slides asked me what I was using when he saw the results.
(by Peter K.)
Possibly the finest 100-105mm macro tele ever made, at least in manual-focus form. Came in C/Y mount for Contax/Yashica as well as Nikon, Canon, and others. This exact same lens is also encountered labeled as the 'Lester A. Dine' dental macro. A razor sharp lens at all apertures above f2.8, and at f/2.8, a very sharp portrait lens, with very nice bokeh.