6. Distortion and field of view
Field of view
A rectilinear 35 mm lens on a full frame sensor should provide you an angle of view of 63.4 deg but the producers in their official specifications state 63 deg. Of course we decided to check how big this field really is. In order to do so, we took photos of a starry sky and saved them as uncorrected JPEG files. Then we transformed the pixel layout (X,Y) from the photo into the equatorial coordinate system (right ascension and declination), which locates a star on a celestial sphere. That way we were able to measure the field very precisely and exactly as it should be done for rays of light coming from infinity. Our transformation was based on positions of 116 stars spread evenly across the frame. An average mesh-fitting error amounted to just 45 seconds of arc.The result, reached by us, amounted to 65.60 deg with a measurement error on a level of 0.05 of a degree. It's even a tad higher than stated in official specifications and it means it is the equivalent of a distortion-free lens of a focal length amounting to 33.6 mm.
Distortion
When you work on the smaller APS-C/DX sensor geometric deformations are slight, reaching -0.97%.
On full frame, distortion is a bit higher, its barrel variant reaching -1.45%, but not something you could complain about. Especially that moustache distortion is just slightly accented here, never rising to such a high level as in case of the Viltrox AF 35 mm f/1.2 LAB, tested by us not so long ago.
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Still, it is interesting that the much cheaper Nikkor Z 35 mm f/1.8 S is able to correct distortion a tad better, in its case, we got a result of -1.28%. The Nikkor Z 35 mm f/1.4 for a change, fares the weakest here, giving up on distortion correction with its barrel variant amounting to as much as -5.31%.
| Nikon Z8, 35 mm, JPEG, APS-C/DX | |||
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| Nikon Z8, 35 mm, JPEG, FF | |||
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