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Non Nikon Z lens, few options

mklass mklass

Is from: Bremerton, US
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"RE: Non Nikon Z lens, few options"

mklass Platinum Member As a semi-professional involved in all manner of photographic genres including portraiture, ... Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014 Ribbon awarded for his most generous donation in 2017 Ribbon awarded for his very generous support to the 2017 fundraising campaign Donor Ribbon awarded for the most generous contribution to the 2015 campaign Donor Ribbon awarded for the extraordinary generous contribution to the 2016 campaign Donor Ribbon awarded for the most generous contribution to the 2016 campaign Nikonian since 08th Dec 2006
Wed 30-Sep-20 12:31 AM | edited Wed 30-Sep-20 12:33 AM by mklass
An interesting thing that I have learned using the TechArt adapter and a number of Sigma, Sony and Tamron e mount lenses: Since the lens is being used on a non-native camera, in-camera distortion correction is not available. So when you look at the raw file or an extracted JPG before processing, you see the inherent distortion in the lens.

At first I thought this was caused by the adapter, but I checked with Sigma, because the new 85mm f/1.4 DG DN Art is truly horrible looking before correction. When I asked Sigma about this, they said I needed to have distortion correction turned on in the camera, otherwise this is what you get:

Click on image to view larger version


That window is square and flat, it isn't a bow window. And the distortion continues well past just the edges. The top edge of the window blind should be straight.

I have never seen significant distortion on any of the Sigma Art lenses (and I have owned most of them) so this was truly astounding. In this case Sigma seems to have given up on good optical design and is relying on software to generate a decent image. (On the other hand, the Sigma 35mm f/1.2 DG DN Art is distortion free when mounted on a Z7 with the Techart adapter. Other lenses have moderate distortion.)

In discussions on Fred Miranda about the Techart Adapter, it was stated that even the great performance of Nikon Z lenses is significantly due to in-camera distortion correction. The 24-70 f/2.8 S apparently has 3%+ pincushion in it's uncorrected state, a threshold that is generally considered unacceptable. But the in-camera distortion correction generates a good NEF.

Some say this is an intent problem with mirrorless cameras. Is it? Does it matter that the lenses are less than perfect (sometimes far less) and rely on computer programming to make them good? Seems like cheating to me, especially when you pay a premium price for a lens. Both the 24-70 f/2.8 S Nikkor and the 85mm f/1.4 DG DN Art Sigma are premium priced.
Attachment#1 (jpg file)

Mick
"The difference between a professional photographer and other photographers is the pro doesn't show you the bad shots."

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A general, generic topic Non Nikon Z lens, few options [View all] , nkcllewis Gold Member Ribbon awarded for his generous support to the Fundraising Campaign 2017 , Mon 21-Sep-20 04:57 PM
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