Sony 16, Sigma 19, Nikon 20 Landscape Comparison

Started Apr 9, 2012 | Discussions thread
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flint-hill
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Sony 16, Sigma 19, Nikon 20 Landscape Comparison
Apr 9, 2012

Tilted landscape comparison of three lenses at five apertures f/2.8 to f/11.

Reduced and full resolution JPG's here:

http://www.flickr.com/photos/flint-hill/sets/72157629771675417/

Questions:

1. What are the "best" (sharpest corner-to-corner) landscape apertures for each lens.

2. Considering each lens at its best aperture, how do the lenses rank for landscape use.

Lenses:
Sony 16mm f/2.8 E
Sigma 19mm f/2.8 EX DN
Nikon 20mm f/2.8 AIS (Fotasy adapter)

Test conditions:

Facing north, mid-afternoon, direct sunlight from southwest. Target is a treeline at about 75 meters for Sigma and Nikon and about 65 meters for Sony. (Tripod moved to equalize field of view for the shorter Sony lens.)

Camera:

Sony NEX-5N on Bogen 3021 tripod. Manual focus by focus magnification. Manual exposure. IR remote release.

Postprocessing:
Adobe Camera Raw defaults. No further corrections.

Conclusions:

Nikon and Sigma CA is fully correctable. Sony CA is not fully correctable. The Sony has purple fringing to a degree not evident in the other two lenses. CA not considered from this point on. Vignetting is fully correctable for all lenses and not considered further.

Nikon is best at f/8. Performance at f/5.6 is almost identical.

Sigma is best at f/5.6. Performance at f/8 is almost identical.

Sony is best at f/8. Corner performance is poor at all apertures. Results are so poor that I have to think the sample is defective.

Sigma at f/5.6 is better as a landscape lens than Nikon at f/8. Either meets my needs as a landscape lens. Both are much better than the Sony at f/8.

Sony Alpha NEX-5N
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