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 $2798
SAVE $click

$1199 $1099
SAVE $100

Ray Angle and Off-center Color Shift

Last updated 2010-01-12 - Send Feedback
Related: color shading, Leica, Leica M, ray angle

View near real-time pricing and availability for Zeiss ZM an Leica M lenses on the Leica M gear page.

The Leica M9 suffers from off-center vignetting and color shading, caused by extreme ray angles. The M9 takes this into account for “coded” Leica M lenses, and one can also choose any such setting for a non-coded lens of any brand. In this way, most of the vignetting and off-center color shading is eliminated provided that the lens you’re using is a good match for a Leica M lens offered as a choice in the camera.

Some lenses are not really usable because of this color shading. Shown below is an image from the otherwise wonderful Zeiss ZM 21mm f/4.5 C-Biogon. It has a severe ray angle, the most extreme of any ZM lens, and this shows up with color shift at the edges: magenta at left and cyan at right.

Guide to Leica

Chief ray angle

The chief ray angle follows from the exit pupil position and the frame size.

In the ray angle column of the table, the first number refers to the object side, the second to the image side. So the first number is nothing else than half the diagonal field angle; and of course it has nothing to do with the sensor response, the colour shading etc.

Two lenses with identical chief ray angle on the image side may still show some difference in shading, if they have different speed. The chief ray angle is just a simple indicator parameter; the real function of a lens+sensor combination is based on a range of ray angles around the chief ray. The chief ray is that light ray which passes through the centre of the iris; in the wide open lens there are rays to the same image point, which are less inclined and some which are more inclined. The total energy is transferred by many rays which might have different efficiency.

Click for larger image
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!
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!
Organic Lab Tested Full Spectrum CBD

20% off every day with coupon code diglloyd20 at NuLeafNaturals.com

Updated formula with more CBD!
100% organic non-GMO, no additives or preservatives, lab tested for purity and quality.

Our trusted photo rental store

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.