Latest or all posts or last 15, 30, 90 or 180 days.
Upgrade the memory of your 2018 Mac mini up to 64GB
Today’s Deal Zone Items... Handpicked deals...
$4499 $3499
SAVE $1000

$249 $219
SAVE $30

$1398 $898
SAVE $500

$1699 $1349
SAVE $350

$21999 $19999
SAVE $2000

$8399 $7599
SAVE $800

$1149 $799
SAVE $350

$260 $180
SAVE $80

$4998 $3998
SAVE $1000

$569 $519
SAVE $50

$899 $799
SAVE $100

$2347 $1997
SAVE $350

$883 $633
SAVE $250

$1299 $949
SAVE $350

$1699 $1349
SAVE $350

$2798 $2498
SAVE $300

$1199 $1099
SAVE $100

Organic Lab Tested Full Spectrum CBD

20% off every day with coupon code diglloyd20 at

Updated formula with more CBD!
100% organic non-GMO, no additives or preservatives, lab tested for purity and quality.

The Reality of Zoom Lens Performance — Sigma 14-24mm f/2.8 DG DN Art

In The Reality of Zoom Lens Performance, I discussed reasonable expectations for zoom lenses.

Having just purchased the Sigma 14-24mm f/2.8 DG DN Art, I thought a brief discussion was in order on what I found.

I compared the two samples of the Sigma 14-24mm f/2.8 DG DN Art at 24mm, as that is the weak end of the design.

  • The first sample (the one I shot on my trip) is weak on the left side, and skews its sharpness rearward on the right side.
  • The new sample skews its focus strongly forward on the right side and rearward on the left side—the reverse of the first sample.
Sigma 124-24mm f/2.8 DG DN Art

Averaging it all out, I’d say they are comparable, but quite different in their skewed planes of focus. Thus the need to thoroughly understand a specific sample of a specific lens model when aiming for optimal results.

It is why, for example, I always focused the first sample on my trip towards the top right of the frame (when focusing at distance)—this was the optimal way to do it for that sample, but the top left would be optimal for the 2nd sample.

The whole situation is ridiculous, and it’s not just Sigma. NONE of this should be taken to mean that I think Sony zooms are better, indeed I think Sony lenses are at least as prone to such issues. It is also an argument for primes, except that high performance prime lens designs suffer similar issues. Still, Zeiss Loxia lenses have been very consistent for me in terms of symmetry (my Loxia 21/2.8, 25/2.4, 35/2, 50/2, 85/2.4 all have excellent symmetry) and I rate them highly for that reason.

I don’t expect a sample to have perfect symmetry, but this symmetry variation of the Sigma 14-24mm f/2.8 DG DN Art is so strong that a comparison is absurd, that is, in the sense of determining which lens is sharper. Even just getting AF to agree on the same focus at center proved troublesome.

For my meticulous work, I am not content with lenses that are clearly weak on one side or the other: asymmetry creates all kinds of execution headaches, and complicates focus stacking even at f/8 (creates confusion when retouching because of where sharpness lands).

All that said, I made many fine images with the Sigma 14-24mm f/2.8 DG DN Art, and at f/8 it has little if any competition, excepting the Zeiss Loxia 24mm f/2.4. So I still recommend it/both.

I’ve decided to send this new sample back. Maybe in 6 months Sigma will get its act together and I will re-buy. When I do buy again (I plan to), I will probably have to try 3 or 4 samples to find one I am satisfied with.

Or maybe Sigma can read this and send me a sample to prove to me they can actually build a real lens that performs to claims. Until then, I consider all Sigma claims of performance and MTF testing to be marketing bullshit.

Save the tax, we pay you back, instantly!
View all handpicked deals...

Pentax 8x42 S-Series SD WP Binoculars
$249 $219
SAVE $30

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.