Sigma 135mm F1.8 DG HSM Art - the artificial star test on a full frame camera, at f/1.8
Disclaimer:
the test is done with the astrophoto in mind. "General purpose" performance is not the point here, the lens is simply great for it.
This is the artificial star test of the Sigma 135mm F1.8 DG HSM Art lens on Nikon D750 full frame camera.
Two "artificial star fields" are used. The left one has somewhat purple cast while the right one is almost "white" for unaided eye but has small greenish cast on the photo.
Shot at f/1.8.The distance to the target was ~6 meters.
Crops of the center and corners of full frame (FF) obtained with Nikon D750 are presented at 400% and 100%.
Sigma 135mm F1.8 DG HSM Art lens is perfect by the optical design and could be used for astrophotography at f/1.8, wide open.
Vignetting map at f/1.8 is published at
www.flickr.com/photos/ytoropin/34032575506/
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For comparison, you can check star tests for the next lenses:
Samyang F2.0/135mm ED UMC, 3-4 times cheaper, that is also great for astrophoto
www.flickr.com/photos/ytoropin/19318779652/
Zeiss APO Sonnar T* 2/135 mm ZF.2, a little bit more expansive
www.flickr.com/photos/ytoropin/19137234088/
AF-S Nikkor 105mm f/1.4E ED
www.flickr.com/photos/ytoropin/29318056390/ - full frame,
www.flickr.com/photos/ytoropin/28982739254/ - DX frame.