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Forum: Pentax K-3 & K-3 II
11-15-2014, 10:56 AM
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It is the same as you deduce. The Vivitar has been sitting on the shelves for years because it was priced higher than the others. There is a very slight chance that the coatings are different, but that would be the extent of it. When you look at the 8mm rebrandings, some are claimed at as low as 6.5mm. When you take into account the significant barrel perspective, the lenses are hard to rate - and the 14mm units do take in a bit more in the corners so 13mm might be closer than 14mm in reality. In any event, the stated specs in terms of FoV and size and weight indicate these lenses are all from the same source.
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Forum: Pentax K-3 & K-3 II
11-14-2014, 10:32 PM
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They are the same lens - all are produced by Samyang. The Vivitars often have a cosmetically distinctive look - essentially different rubber and barrel paint.
It is a good lens in almost all respects. The barrel distortion is very apparent, but pleasing IMHO. Not good for architecture, but then again perspective is easily corrected with good software.
As a full frame, the lens is huge, and markedly front heavy. Optically, it has been shown to be much closer to the Zeiss 15mm IQ than the Sigma - which in turn is far superior to the Pentax 14mm. However, if I was buying a lens to carry up a mountain, it would be the Pentax 15mm which is quite close to the Samyang in IQ overall (the Pentax is possibly slightly less sharp, but probably a tad better in contrast and color rendition).
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