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Forum: Pentax News and Rumors 06-29-2018, 09:13 AM  
RICOH ANNOUNCES AVAILABILITY OF HD PENTAX-D FA★50mm F1.4 SDM AW STAR-SERIES LENS
Posted By Fenwoodian
Replies: 1,144
Views: 107,079
Roger is my hero! I value his opinion more than anyone else who publishes on the Internet.


Here's my favorite Roger article - Lens Rentals | Blog .


Will stopping down the new Pentax 50mm f/1.4 lens to f/2 greatly improve it's sharpness, or will it already have a high level of sharpness wide open? That's the big question I have.
Forum: Pentax News and Rumors 06-29-2018, 08:15 AM  
RICOH ANNOUNCES AVAILABILITY OF HD PENTAX-D FA★50mm F1.4 SDM AW STAR-SERIES LENS
Posted By Fenwoodian
Replies: 1,144
Views: 107,079
On a Nikon D800E these premium 50mm f/1.4 lenses score 41 (Milvus) vs 46 (Sigma).

My eyes can not differentiate a mere 5-point difference in score on the objective measures (e.g. sharpness, distortion, vig, chr. aberrrations) that DxOMark tests for.

Far more important to me are subjective lens differences in the areas of color, bokeh, and micro-contrast. DxOMark does not measure these more subjective lens characteristics.

Yesterday I did extensive, head-to-head testing on two 135mm lenses (Samyang 135/2 in K mount, & adapted Leica R 135/2.8). While neither lens is rated by DxO, if they were, I am certain that the modern Samyang lens would be rated much higher than the older Leica lens. The Samyang lens is incredibly sharp, has little vignetting, and almost no CA or distortion. The Leica has more vig, more CA and is no where near as sharp.

Overall, I greatly preferred the more "artistic" rendering ("Leica Look") of the Leica over the more "technical" rendering of the Samyang lens. In fact, I so much more prefer the rendering of the lower rated Leica, that I intend to sell the more higher rated Samyang lens.

As far as on-line lens ratings go, I actually prefer the broader and more comprehensive rating system that Lenscore.org uses to evaluate lenses, over the DxOMark lens rating system. Lenscore evaluates many lens characteristics (color, contrast, flare, star, bokeh) that DxO does not. Lenscore rates the Sigma 50/1.4 1053, and the Zeiss Milvus 50/1.4 1054 (a virtual tie)!

Any of the popular lens rating systems (DxOMark, Lenscore, etc.) are a valid starting point in ones' lens evaluations. But for me, I prefer to make my final lens decisions based on real-world, head-to-head lens comparison tests that I make myself.
Forum: Pentax News and Rumors 06-28-2018, 08:48 PM  
RICOH ANNOUNCES AVAILABILITY OF HD PENTAX-D FA★50mm F1.4 SDM AW STAR-SERIES LENS
Posted By Fenwoodian
Replies: 1,144
Views: 107,079
.
Not possible to compare these two lenses. The Sigma 50 Art is not available in Pentax mount. Also, it is not adaptable to Pentax K mount.

A better comparison would be against my Leitax adapted Zeiss ZF "Milvus" 50mm f/1.4 lens. Both lenses are the same price ($1200).

So, if any of you buy the new Pentax 50, either we can get together here in Wisconsin with our lenses and K1 bodies and have a nice shoot out; OR you can loan me your new Pentax lens and I'll compare the two lenses by myself. :p
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