Digital SLR Photography Guide

Custom Search

 go to Home go to Beginner Tips and Tutorials go to Camera Settings go to Online Photography Courses go to Photography eBooks go to Blog go to iPhone App

'Canon DO' lens range with green ring - What does the green ring mean?

If you've been on the hunt for a new digital SLR Canon lens lately, you may have noticed a range that has a green ring. For example, Canon's EF 70-300mm f/4.5-5.6 DO IS USM lens, shown in the image below, has a green ring.

example of a Canon DO lens with a green ring

The green rings means it comes from the DO range of digital SLR Canon lenses. The letters DO stands for diffractive optics. I won't go into the technical details of how these lenses work, as this information is already listed on a wikipedia article about Defractive Optics. In short, what it means is that the lens contains superior characteristics that allows it to take sharper photographs. Furthermore, DO lenses are smaller and lighter than non DO lenses.

Is a DSLR Canon lens with a green ring (DO) as good as one with a red ring (professional L series)?

Canon DO lenses are not considered as good as their professional L camera lenses, however they are very close. As noted earlier, the main advantage being smaller dimensions and lighter weight. However, there a few gripes as well. For example, many photographers have noticed problems with lens flare or bullet hole patterns seen within the bokeh from time to time. Some like the bokeh effect, others don't. You can read some discussions on defractive optics and view examples of photographs taken with them at the flickr DO IS USM group.

Related Articles:

New iPhone App that will improve your DSLR Photography.
Created by SLR Photography Guide!

SLR Photography Guide iPhone App
Dedicated to helping you better understand your Digital SLR Camera:
Read More

Online Photography Course Username:


     Sign Up Here!

beginner online photography course


go toBest aperture setting for portraits
go toHow to photograph people jumping
go toHow to focus for landscapes
go toShooting cascade falls
go toHow to photograph waterfalls and streams
go toHow to choose the correct ISO setting
go toLearn about animal photography
go toLearn about partial metering
go toWhat is the best portrait lens
go toWhen to use spot metering
go toWedding photography tips for amateurs
go toHow to photograph moving objects
go toTips for selling stock photography
go toHow to get into Shutterstock
go toBird Photography
go toHow to photograph lightning


go to DSLR settings
   - ISO camera settings
   - Shutter speed
   - AV mode
go to DSLR photography tips
go to Photo editing software
go to Things I wish I knew when I started
go to Night Photography Settings
go to Macro photography tips

Photography blog
SLR camera settings explained
Digital photography tips
Photoshop tutorials for photographers
About SLR Photography Guide
Chat with me about photography on Facebook

© 2007 - 2016 Tanya Puntti - SLR Photography Guide