Latest or all posts or last 15, 30, 90 or 180 days.
Upgrade the memory of your 2018 Mac mini up to 64GB
128GB Memory in iMac 5K

Up to 128GB for 2019 iMac 5K!
Up to 64GB for 2015/2017 iMac 5K

Save nearly 50% over Apple pricing

Sigma FE 14mm f/1.8 DG HSM Art Aperture Series and Field Curvature and Focus Shift Analysis: Lingering Snow

Get Sigma DG HSM Art lenses at B&H Photo as well as Sony A7R III and see my Sony wish list.

Sometimes it takes just the right scene to make plain the actual lens behavior, which can be difficult to analyze on many scenes due to the choice of focus versus 3D structure of the scene versus optical behavior.

This scene extends the field curvature analysis in Hiker at Upper Conness Lake. It proves to be a remarkable demonstration of both field curvature and mid-zone focus shift which should persuade anyone of the near-irrelevance of “quick tests” or lab tests which purport to show lens performance in real world shooting.

Optical designs often must be compromised in some way to balance out competing challenges, particularly with ultra wide lenses. These compromises increase with fast lens speed. This is why I generally frown upon fast wide angle lenses for my work: not only are the compromises generally troublesome, but the lenses become bulky and unwieldy and too heavy.

Sigma FE 14mm f/1.8 DG HSM Art Aperture Series: Lingering Snow

Images at sizes up to full camera resolution from f/1.8 through f/11.

Tenaya Canyon Pool
f1.8 @ 1/5000 sec, ISO 50; 2018-09-11 13:42:38
[location “Upper Conness Lake”, altitude 10650 ft / 3246 m, LACA corrected]
Sony A7R III + Sigma 14mm f/1.8 DG HSM Art

[low-res image for bot]
OWC Thunderblade Thunderbolt 3 SSD
Gen 2!

Blazing fast, 1TB, 2TB, 4TB, 8TB.

Lloyd’s all-time favorite SSD!

√ No more slow and noisy hard drives!
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 20 hours unless noted. Certain deals may last longer.

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.