This page may contain affiliate links that pay me a small commission. There is no cost to you. You can review the affiliate statement at the very bottom of this page if you want more information. As an Amazon affiliate Canon Camera Geek may earn a small commission from qualifying purchases, at NO added cost to you.


Telephoto Extension for Canon 70-300mm Lens USM.

by Philip
(United Kingdom)

Canon 70-300MM Lens

Canon 70-300MM Lens

"I have the canon 70 to 300mm Nano USM, and I would like to buy a 1.4 telephoto extender, but see it will not work directly as the lens is too close to the end.
So wonder is there any reason why a extension tube would not work?"


Hi Philip,

Thanks for your question about Canon teleconverters vs. extension tubes. It's easy to get confused when comparing these two different Canon lens attachments. Some of the confusion comes from the fact that Canon's teleconverters are often called tele-extenders. That sounds like extension tubes. We'll get to that in a second.

First, yes, you can use extension tubes with your Canon EF 70-300mm Nano lens. Extension tubes have no optical lens elements. They are actually empty tubes that increase the spacing between your 70-300 lens and the camera. The better ones will maintain the automatic functions with good electronic communication between the original lens and camera body.

The newer Canon 70-300mm lens has an added glass element in the back of the lens that was designed to protect the rear elements from dust and moisture. That prevents the use of a teleconverter with the 70-300mm lens. See the photo below.


Rear Lens Element of Canon 70-300mm Lens


Teleconverters have an element within their design that protrudes forward into the telephoto lens in a normal set up. This is also why teleconverters can't be used with wide angle lenses either.


Teleconverter Diagram



Extension Tubes and Teleconverters

Both extension tubes and tele-extenders (Actually Canon Teleconverters) fit in between your Canon camera and your lens, but there are big differences between the two.

EXTENSION TUBES. Extension tubes do not magnify the subject. They allow you to get closer to the subject by reducing the minimum focusing distance. Essentially, they extend the regular distance between your lens and the camera sensor and allow you to move in closer.
TELECONVERTER. Teleconverters actually magnify the image of your subject, the most common being by a factor of 1.4x.

I hope that helps,
Thank you,
Bruce


RELATED POSTS


Extension Tubes For Canon Lenses
Canon Lens Accessories

Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Ask The Canon Geek.


Author Bruce Lovelace
Bruce Lovelace Signature

Bruce Lovelace is the publisher of Canon Camera Geek. Read more about him on the About Page. He also publishes how to articles and camera gear reviews at the Photography Tips website.

View some of Bruce's photos on Instagram  and Flickr  Join the tribe of followers on YouTube. Visit the Canon Geek FaceBook Page. Bruce also runs photo workshops and provides 1 on 1 digital photography coaching.


You might like these




Search for articles on this Site:


Recent Articles

  1. Can I Attach RF100-400mm F5.6-8 lens
    to Rebel T100 Camera

    Sep 24, 22 06:00 AM

    Is there anyways of putting a RF100-400mm F5.6-8 Lens on a Canon EOS Rebel T100 Hi Brook! Thanks for asking about compatibility between one of the

    Read More

  2. Canon RF 100mm Macro Lens Image Stabilization. Test And Examples

    Sep 15, 22 04:16 PM

    Does Canon's IS rating with the RF 100mm lens match up with real world situations? Canon RF 100mm Macro Lens Image Stabilization Test

    Read More

  3. What's The Purpose of The Canon RF 100mm macro SA Control. Gimmick ?

    Sep 13, 22 07:21 PM

    To some it's a gimmick. To others it's a valuable feature. Here are the pros and cons of the Canon RF 100mm SA control. Creativity With Spherical Aberration

    Read More

  4. Best Lightweight Canon Camera For Safari

    Sep 11, 22 07:18 PM

    Hi Bruce, I’m taking a trip to Africa for a photo safari. I am not an experienced photographer, so I’m looking for a lightweight camera that will produce

    Read More

  5. Canon EOS M Camera, Canon's First Attempt At a Good Mirrorless Camera

    Sep 11, 22 10:51 AM

    Their first Mirrorless Camera, the Canon EOS M. What you should know before you buy.

    Read More



Sign up for a monthly update

Enter Your E-mail Address
Enter Your First Name
Then

Don't worry — your e-mail address is totally secure.
I promise to use it only to send you Canon Geek Newsletter.