Originally posted by monochrome I commented on the thread last night, “Now that you have silently edited the caption on the cat photo from f/3.2 to f/1.4 to reflect the actual EXIF value are you also going to correspondingly change the text in the body of the review? LoCA is not prominent at f/4 in any of your sample photos.”
IMO, that's a fair comment. I would say that in the sample images in the gallery, LoCA is practically insignificant at apertures of
f/4 and narrower, even in images that were shot against the sun or in very harsh lighting. There are examples of LoCA, certainly, but they're prominent mainly in a few images at the widest apertures.
It appears that it's difficult to provoke detrimental LoCA with this lens.
While DPR's reviews should be lauded for including extensive sample images at full resolution (RAW and JPEG), the nature of the images is inconsistent across comparable lenses. For example:
Pentax D FA* 50/1.4 gallery:
- 88 images
- 26 were shot wide open (30%)
- 35 at f/2 or wider (40%)
- 37 images (42%) were shot against bright light or sun, or in very harsh lighting.
Sigma 50/1.4 Art:
- 48 images
- 7 shot wide open (15%)
- 11 at f/2 or wider (23%)
- 9 (19%) against bright light or sun or in harsh lighting
DPR's deletion of your post raises a question of their editorial integrity, especially if it was done silently and without a follow-up comment from one of the DPR reviewers. I think the action also reinforces the lack of credibility of the review. Their main criticism of the lens -- LoCA up to and including f/4 -- is not backed up by a sufficient number of sample images. Geez.
- Craig