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

Sigma 14-24mm F/2.8 DG DN Aperture Series @ 24mm: Teak Bench Closeup

This series from f/2.8 through f/11 evaluates the Sigma 14-24mm f/2.8 DG DN Art at 24mm for sharpness at close range as well as focus shift, bokeh and secondary color. Shot in pixel shift mode for absolute highest sharpness. As well, lens skew is demonstrated.

Sigma 14-24mm F/2.8 DG DN Aperture Series @ 24mm: Teak Bench Closeup

Includes images up to full camera resolution from f/2.8 through f/11.

I am excited about the about $1399 Sigma 14-24mm F/2.8 DG DN, but this sample clearly has a lens skew issue that shows up at both the wide end and the long end. I won’t be doing any more testing with it unless the 2nd sample is worse (2nd sample shows up on 5 days from now).

Optical designs can look great on the computer but real lenses have to be built, and production tolerances can make high performance designs that deliver the as-designed performance difficult to produce. Thus fantasy MTF charts often conflict with reality in a real lens. I plan on buying the about $1399 Sigma 14-24mm f/2.8 DG DN Art, and I will try a 3rd sample if necessary to get one that is top-grade as-built, or a 4th or a 5th—hopefully Sigma quality control is not that bad.

CLICK TO VIEW: Recommended Ultra Wide Lenses for Sony

f2.8 @ 1/13 sec pixel shift, ISO 100; 2019-09-03 19:23:01
Sony A7R III + Sigma FE 14-24mm f/2.8 DG DN Art @ 24mm RAW: LACA corrected
PSMS painted over with single shot for poppy at left

[low-res image for bot]

OWC Envoy Pro EX SSD
Blazingly fast Thunderbolt 3 SSD!

Up to 4TB capacity, USB-C compatible.

USB-C model also available

Great for travel or for desktop!
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.

Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.


√ No more slow and noisy hard drives!
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.

Best Deals, Updated Weekly
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.