ZM 28/2.8 Biogon T*

Details: Created: Saturday, 19 April 2008 05:51; Hits: 5215

The Compact Wide Angle ZM 2.8/28 Biogon T*

28mm is a focal length that I like very much. I used a lot of 28mm with my Praktica PB system. When I switch to Rolleiflex QBM only Zeiss 25/2.8 Distagon was available. Now my Contax SLR I use the 28/2.8 Distagon, which performs very well to my expectation.

Rollei 35RF, UC100, f4 1/125. 29 Mar 2008

The ZM 28/2.8 Biogon seems underrated, especially when comparing its MTF against the very popular and probably the highest resolution Zeiss ZM 25/2.8. On paper the ZM 28 Biogon MTF is comparable to the C/Y 28/2.8 Distagon, not very much superior other than the better distortion control. I own the 21/2.8 ZM Biogon, which has a very similar MTF to the 25/2.8 ZM Biogon. Comparing the photos taken by the ZM 21/2.8 and the 28/2.8, I am fully satisfied with the performance of the ZM 28. Perspective distortion is still tricky despite it is not as wide as the 21mm. Corner performance is very good and overall a lens very comfortable to use. It is a compact lens and can be used confidently wide open at f2.8. Bokeh at f2.8 is typical of Zeiss and is nice. I normally use the 28/2.8 ZM Biogon with the entire viewfinder of Rollei 35RF viewfinder. Sometimes I use it with the old Zeiss Ikon 436 exernal finder with very odd frame lines for 30mm, 40mm and 75mm, and with close distance parallax correction. One main consideration of me getting the 28mm over the 25mm is the possibility to frame without external finder.

After many months of using the lens, I do get very satisfying photos from this lens. Despite a seemingly unimpressive MTFs, I would say for my practical purposes up to 8x12 prints, this lens is good enough, and in fact it is very good.