Latest or all posts or last 15, 30, 90 or 180 days.
Welcome to diglloyd.com
In-depth review coverage is by subscription.
Also by Lloyd: MacPerformanceGuide.com and WindInMyFace.com
First-time visitor
Durable and fast, up to 1800MB/s
🌈Shooting in Mountains thru ~Oct 27
I descend for internet service each day *when feasible*, but not always. Please be patient when subscribing. Hiking injured knee but cycling is therapeutic.

Zeiss Batis 18mm f/2.8 Distagon: MTF Can Be Better than the MTF Charts Show

Get Zeiss Batis at B&H Photo. Direct link to Zeiss Batis 18mm f/2.8.

Zeiss Batis 18mm f/2.8 Distagon

Zeiss MTF is measured with a real lens on the K8 MTF tester using appropriate thickness sensor cover glass for the target camera platform using white light. Thus: real lens with white light with diffraction accounted for and the actual camera platform. The only other vendor which (maybe) does this (and only for one aperture) is Sigma.

Because of the K8 measurements with a real lens (but no camera), the Zeiss MTF charts cannot account for software correction of chromatic aberration.

See my in-depth discussion of the MTF charts for the Zeiss Batis 18mm f/2.8 Distagon., but here is one point of discussion regarding astigmatism.

Astigmatism

As per Zeiss, the astigmatism in the MTF graphs is largely related to lateral chromatic aberration. Not all of it, but a good portion of it. This is a common behavior for ultra wides, including Leica M and other brands.

Correction for chromatic aberration via in-camera JPEG or during raw conversion means that the MTF will be better than shown, namely, reduced astigmatism.

Since Adobe Camera Raw forces-on chromatic aberration correction regardless of camera settings, there will be near zero chromatic aberration and performance will be closer to the sagittal (solid) lines in the graph.

MTF for Zeiss Batis 18mm f/2.8 Distagon
Durable and fast, up to 1800MB/s
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 98 min unless noted. Certain deals may last longer.
$2699 SAVE $300 = 10.0% $38 FREE ITEMS Canon 11-24mm f/4 EF L USM in Lenses: DSLR
$774 SAVE $222 = 20.0% $100 GIFT CARD Pentax 10x43 Z-Series ZD ED Binocular in All Other Categories
$1497 SAVE $400 = 21.0% $82 FREE ITEMS Pentax K-1 DSLR in Cameras: DSLR

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2008-2017 diglloyd Inc, all rights reserved.