2 EV for the Milvus/ZE/ZF.2 (DSLR) lens. The graph for vignetting indicates approx. Both are retrofocus Distagons.įrom the graphs for distortion, we see both lenses have very similar, about 2% barrel distortion without any digital correction applied.
Let's consider distortion, and compare the Zeiss Loxia 21/2.8 for mirrorless Sony and the Zeiss Milvus/ZF.2/ZE 21/2.8 for DSLRs. It is well known that all lenses will vignette less as you stop them down, so comparing a lens that starts at f/1.8 to one that starts at f/2.8 may be a skewed comparison. The Nikon AF Nikkor 20/2.8 has a vignetting of 2.26 EV at f/2.8 and the Zeiss ZF.2 21/2.8 has a vignetting of 1.99 EV at f/2.8 which is less than 0.5 EV difference from the Fuji 14/2.8 at f/2.8. I have of course no affiliation with the author of PTlens.Quote from: bjornthun on July 09, 2016, 15:19:11 Let's compare these figures to two Nikon mount 20/21mm lenses. There is a free trial so you can "Try before you Buy". I use this on every Digital photograph I take and it is well worth the $15 (£7.50) it costs. You can also use PTlens to correct for Perspective Distortion, Lens Vignetting, and Chromatic Aberation but this requires a small amount of user input.
You install the program, select a photo, run Ptlens and it automatically corrects the image for all distortions, so your "cheap" lens becomes optically perfect, free of any lens induced distortion. This program from Tom Nieman has a database of lenses (if yours is not included you can send a photo of a specially constructed chart to Tom and he will included your lens in the Database). These are at a minimum in expensive lenses like Cannon and Nikon prime lenses, but can be noticeable in even the most expensive zoom lenses and all compact camera lens designs. If you are one of the millions of people that own a Digital camera then you need a small program called PTlens (Why? Because all camera lenses what ever their cost produce distortions, like pincushion distortion, and aberrations, like chromatic aberration.
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