Zeiss Distagon 21mm F2.8, occasion, bague Canon

Zeiss Distagon 21mm F2.8, occasion, bague Canon

Zeiss Distagon T* 21mm f/2.8 ZF (ZE) (on Canon EOS) - Review / Lab Test - Analysis

Distortion

Ultra-wide lenses are usually a bit "laissez-faire" when it comes to distortion but the Distagon is actually capable of producing a fairly moderate degree of barrel distortion (~1.7%) albeit with a little mustache sub-style.

The chart above has a real-world size of about 120x80cm.

Vignetting

The Zeiss lens has one weakness - the amount of vignetting is fairly hefty at around 2.5EV at max. aperture. This may be a rather typical value within this class but regarding its ultra-large front element we hoped for a better performance here.

MTF (resolution)

The resolution of the Zeiss lens is very high straight from f/2.8. The peak quality is reached at f/5.6 but there're only minor quality variations across the tested aperture range actually. The best news is the comparatively even quality across the image field ... which isn't exactly a well-known characteristic for EOS users in this focal length class.

Please note that the MTF results are not directly comparable across the different systems!

Below is a simplified summary of the formal findings. The chart shows line widths per picture height (LW/PH) which can be taken as a measure for sharpness. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations

Chromatic Aberrations (CAs)

Lateral CAs are very well controlled at less than 0.8px on the average at the image borders (and even in the corners). This is pretty much negligible in field conditions.

Objectif de très haute qualité.

État : excellent état cosmétique et fonctionnel. 

Aucune marque d'usure n'est présente sur cet objectif.

Prix de vente 800 CHF (prix neuf 1800 CHF)