Latest or all posts or last 15, 30, 90 or 180 days.
Upgrade the memory of your 2018 Mac mini up to 64GB
Handpicked deals...
$1999 $1399
SAVE $600

$1399 $1399
SAVE $0

$999 $949
SAVE $50

$3998 $3498
SAVE $500

$569 $469
SAVE $100

$249 $214
SAVE $35

$600 $279
SAVE $321

$1299 $999
SAVE $300

$3899 $3499
SAVE $400

$1498 $1198
SAVE $300

$2299 $1599
SAVE $700

$1598 $1598
SAVE $0

$5500 $5000
SAVE $500

$2600 $2100
SAVE $500

$2798 $2798
SAVE $0

$1299 $950
SAVE $349

$1999 $1399
SAVE $600

$1299 $1124
SAVE $175

$2299 $1799
SAVE $500

$1299 $999
SAVE $300

$3397 $2697
SAVE $700

$3297 $2797
SAVE $500

$1999 $1199
SAVE $800

$3399 $2199
SAVE $1200

$400 $300
SAVE $100

Apple MacBook Pro 16"

Most Powerful MacBook Pro ever!.

CLICK THIS AD to pre-order. !

Review planned, consult with Lloyd on what to buy!


√ B&H Photo PAYS THE SALES TAX FOR YOU More info...

Carl Zeiss on lens distortion

Just posted is a new white paper on distortion by B. Hönlinger and H. H. Nasse. You can also read a brief summary of distortion.

One of the lowest distortion lenses available is the Zeiss ZF 100mm f/2 Makro-Planar. The Zeiss ZF/ZE 85mm f/1.4 Planar is also very low distortion. For details on both, see Guide to Zeiss.

When we talk about distortion with wide angles lenses, it’s all relative; “low distortion” can mean “quote noticeable warping” with some subjects. Very few wide angle lenses are free from distortion; the most common is barrel distortion (outward bowing), but “wave” or “moustache” distortion is becoming much more common with advanced designs. Remember, optical design is all about compromises, and it’s hard to banish distortion without resulting in some other reduction in performance; lens designers would eliminate distortion if it were easy!

Shown below is the distortion graph for the Zeiss ZF/ZE 21mm f/2.8 Distagon. On a smaller sensor (Nikon DX or Canon EF-S), distortion will appear as barrel distortion. On full frame, distortion will be visible as wave-type distortion. Compare the distortion graph to that of the Zeiss ZF/ZE 85/1.4 Planar and ZF 100/2 Makro-Planar, then see the examples that follow.

Distortion graph for Zeiss ZF/ZE 21mm f/2.8 Distagon: wave type distortion
Distortion graph for Zeiss ZF 100mm f/2 Makro-Planar: ultra-low distortion
Distortion graph for Zeiss ZF/ZE 85mm f/1.4 Planar: ultra-low distortion

The examples below show the wave-type distortion which can be of concern for architectural photography, whether at distance or closer range.

Architectural photography raises concerns about distortion
Note the visible reversal (“wave”) from barrel to pincushion in the horizontal black line
Man-made objects are the most problematic due to their regularity
Ignore the bent area about 1/3 down, but the rest is lens distortion

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

Sigma 14-24mm f/2.8 DG DN Art Lens for Sony E
$1399 $1399
SAVE $0

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.