• Home >
  • Help
  •  > About Lens Vignetting (Light Fall-off, Peripheral Shading)
 

About Lens Vignetting (Light Fall-off, Peripheral Shading)

Do You Know What We're Looking At?

If you are not familiar with vignetting, please read the Canon Lens Vignetting (Light Fall-off) page to gain understanding of what attributes I am reviewing.

Using the Information

Two views are available for all of the vignetting samples in the database. Select the view (grid layout or contour results) that works best for your research/comparison. To learn the focal length and aperture settings for an individual shot in the grid layout, hover your mouse over the image.

Using the Contour Results Information Tool

Any lens/camera/focal length/aperture combination tested can be compared to any other. Select the first test on the left and the comparison test on the right. You will see the test results selected on the left until you hover your mouse over the result image - then the compare-to test results appear. Moving the mouse back and forth toggles the results - my favorite way to visually compare lens test results. You can even compare a lens to itself at different settings.

Test Shots "With UV/CP Filter"

The set of test shots for a particular lens (at its widest focal length) often include a normal thickness UV or CP (Circular Polarizer) filter in place (noted along with focal length). Compare these results with the results from the same focal length/aperture without the filter attached to look for mechanical vignetting caused by these normal-thickness filters. A slim version of the filter is required if the corner shading increases more than you are comfortable with.

What Is The Small Gray Frame In The Vignetting Sample Pictures?

The small gray frame seen in full frame lens results represents the APS-C/1.6x Field of View Crop Factor (FOVCF) found in many of Canon's Digital SLR Cameras. Nikon's APS-C sensors have a 1.5x FOVCF, so the APS-C frame is slightly tight for the full frame Nikon lenses. If you are using one of these camera bodies (and don't plan to move to a full frame body in the near future), you can disregard the vignetting results outside of the gray frame - where it is strongest.

Imatest

Norman Koren's Imatest is used to plot the f-stop contours on the contour results. Pay attention to the f-stop numbers more than where lines are present on these images. The numbers are what matter as some plots include more/fewer lines which appear at different frequencies.

Back to the Lens Comparisons.


Please support this site and my family by using the links provided throughout the site to make your purchases
Using this link to make your B&H purchase supports this site and my family
Using this link to make your purchase supports this site and my family
Using this link to make your purchase supports this site and my family
Using this link to place your Beach Camera order supports this site.
Using this link to place your Think Tank Photo order supports this site. Should your order total more than $50.00, Think Tank Photo will send you a free gift with your order if this link is used
Using this link to place your MindShift Gear order supports this site.
Canon Refurbished:
(Like new gear at nicely reduced prices)
B&H Photo
Adorama
Canon Store: DSLRs | Lenses | Flashes
 
Fund New Gear by Selling the Used:
Sell Used Gear at B&H Photo (learn more)
Sell Used Gear at Amazon.com
Support this site by ordering a Lensbaby!

Help | Contact Us | Support Us | Terms of Use | © 2003-2014 The Digital Picture, LLC | Bryan CarnathanPowered By Christ!