Latest or all posts or last 15, 30, 90 or 180 days.
Upgrade the memory of your 2019 iMac up to 128GB
Handpicked deals...
$1299 $950
SAVE $349

$299 $199
SAVE $100

$950 $750
SAVE $200

$470 $470
SAVE $0

$4499 $2999
SAVE $1500

$200 $165
SAVE $35

$398 $248
SAVE $150

$4999 $4499
SAVE $500

$2199 $1999
SAVE $200

$2799 $2349
SAVE $450

$120 $120
SAVE $0

$3105 $2499
SAVE $606

$1998 $1298
SAVE $700

$249 $149
SAVE $100

$100 $60
SAVE $40

$2844 $2297
SAVE $547

$1099 $1019
SAVE $80

$899 $530
SAVE $369

$1199 $1099
SAVE $100

$1999 $1379
SAVE $620

$999 $949
SAVE $50

MTF vs Field Curvature and Tips for Optimizing Focus

field curvature, MTF, Zeiss Distagon, focus accuracy

To Making Sharp Images I’ve added/revised two pages:

Both of these should be helpful for the photographer looking to extract maximum performance from high-resolution cameras, regardless of brand.

This example uses a Zeiss lens with modest field curvature: the 25mm f/2 Distagon.

More severe cases

As shown below, the deep dip/wave with the Leica 35/1.4 Summilux-M ASPH FLE is a prime example of a lens whose field curvature is strong enough to have a serious impact on across-the-frame sharpness of planar subjects such as a wall/building or a distant infinity scene: focusing slighty differently to take this into account can in some cases mitigate the loss of sharpness in the mid zones.

MTF for Leica 35mm f/1.4 Summilux-M ASPH

Best Deals, Updated Weekly
View all handpicked deals...

GoPro HERO7 Silver
$299 $199
SAVE $100

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.