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Keywords: Zeiss Canon Nikon Pentax Wide Prime Biogon 21mm Tested


Registered: January 2011
Posts: 1
Carl Zeiss 21mm f/2.8 Biogon T* 2,8/21 ZM review by photomusicfreak
Review Date: 1/20/2011 Would you recommend the product? Yes | Total Spent: $1,100.00| Rating: 9 

Pros: well-made, extremely low geometric distortion, gives no color problems on Leica M9 camera
Cons: Not as small and light as the Zeiss ZM f./4,5 -- 21 mm version

I wanted to get the exact same optical formula/performance on the Leica M9 that I got with the Hasselblad Zeiss Biogon f./ 4,5. I hoped to achieve this on the M9 camera with the Zeiss f./4,5 ZM, using CornerFix to correct the color shifting and vignetting problems Zeiss warned about on that camera due to it's sensor being unable to correct for the steep ray angles at the back focus. I found CornerFix worked some of the time but ultimately just too much work. Enter the Zeiss ZM f./2,8 -- 21 mm Biogon. Even though it is a bit longer (30mm) and heavier (60g) than the f./4,5 I have seen none of the color shifting problems on the M9 camera and of course it has the added advantage of being a faster lens. And any slight barrel (which is almost unnoticeable) can easily be corrected afterwards with software. The big advantage, again, is no color problems and that is a huge advantage over the f./4,5 Biogon


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