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  • Bower MC4 2X AF Teleconverter for Canon EOS EF lenses
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Bower MC4 2X AF Teleconverter for Canon EOS EF lenses

by 2X
39 customer reviews
| 17 answered questions

List Price: $149.99
Price: $117.95 & FREE Shipping
You Save: $32.04 (21%)
In Stock.
Ships from and sold by Fanta Sales.
  • Optical Construction: 4 elements in 4 groups
  • Made in Japan, Lifetime Garantee
  • Fully Multi-coated, automatic diaphragm coupling
  • Magnification: 2x
  • 2x autofocus teleconverter/extender, for Canon EF Lens Systems (NOT compatible with EF-S Lenses)
7 new from $117.91 2 used from $95.00

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$117.95 & FREE Shipping In Stock. Ships from and sold by Fanta Sales.

Frequently Bought Together

Bower MC4 2X AF Teleconverter for Canon EOS EF lenses + Fotodiox Canon EOS Macro Extension Tube Set for Extreme Close-Ups + .43x Wide Angle/Macro Lens for Canon 18-55mm, 55-250mm, 75-300mm III, 70-300mm IS USM, 24mm F2.8, 28mm F1.8, 50mm F1.4, 65mm F2.8, 85mm F1.8, 90mm F2.8, 100mm F2 & 100mm F2.8 lens
Price for all three: $149.85

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Technical Details

  • Brand Name: 2X
  • Model Number: SX4EOS

Product Description

Please will only work with Canon EF Lens System , will NOT work with EF-S Lenses

Product Details

  • Shipping Weight: 6.4 ounces (View shipping rates and policies)
  • ASIN: B000J6AVQ8
  • Item model number: SX4EOS
  • Average Customer Review: 3.6 out of 5 stars  See all reviews (39 customer reviews)
  • Amazon Best Sellers Rank:
  • Product Warranty: For warranty information about this product, please click here
  • Date first available at Amazon.com: November 30, 2006

Read about our customers' top-rated lenses and cameras on our review pages: Lenses, Digital SLR Cameras, Compact System Cameras

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

90 of 93 people found the following review helpful By Amazon Customer on January 30, 2008
Some people have complained about autofocus problems. After reading a little about this, people must understand that for most autofocus systems to work the aperature must be 6 or greater (that means a number smaller than six). But, a 2x converter adds two f-stops to the aperature (decreases the aperature) so you must have a lens that goes no lower than f/4 for the aperature. Most zoom lenses go to somewhere are 5.3 to even higher numbers and that means that as you zoom in on a subject the autofocus will quit working. The answer is that with a teleconverter expect to use manual focus when using a zoom lens.
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66 of 68 people found the following review helpful By F. Yuhico on June 11, 2007
Verified Purchase
First off let me say that South Bay Camera handled my order very well. I really chose a teleconverter based on price. With that in mind I am very satisfied with the product. I confirm what other reviewers mentioned that the AF "hunts" for a focus at higher magnifications so I had to use manual focus. Other than that, I had no other problems with it. FYI, I used the converter on my Canon 75-300mm f4-5.6 III and my kit lens (18-55mm). It worked on both.
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29 of 31 people found the following review helpful By N. T. Blanchard on April 7, 2007
I use this teleconverter with the Canon rebel XTI and the Canon EF 75-300 f4-5.6 III USM lens. The image quality is fine but the autofocus is poor. The lens (with the teleconverter) focuses very slowly at focal lengths under 270mm and at full 300mm it will not autofocus at all. Manual focus works just fine.
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13 of 13 people found the following review helpful By Dennis Whitehead on March 2, 2012
Verified Purchase
Because it was combatively inexpensive, I decided to take a flyer on this. I slapped it on my 70-300 Canon EF lens and it worked well. I took several photos in a wooded, cloudy setting and was pleased with the results. I'd recommend it if you're looking to double your focal length. Remember, though, it will also halve the shutter speed or f/stop.
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11 of 11 people found the following review helpful By L. Freel on July 17, 2010
Verified Purchase
Excellent bang for the $$. Using it with my Canon EF 70-200 mm f4 L the auto focus works fine which surprised me from what some of the reviews indicated. The uploaded photo of the hummingbird was 15 ft away on Auto focus! The ants at pixel level on the bird feeder were very sharp on my monitor. However the edges of other images did have some edge softening on my Canon EOS 30D. On a full frame camera I can see this may be a huge issue. Overall very satisfied.

Update:
I just received my Canon EOS 5D mk2 and with the same lens mentioned above does show a "ton" of softening with the teleconverter. So I'll not be using it on my full frame camera.
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14 of 15 people found the following review helpful By Toby Lagle on April 10, 2007
Does not give you the feel of 2 x zoom but it does help.

If you are using an image stabilized lens you will lose the Auto Focus abilities of the IS lens
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13 of 15 people found the following review helpful By DC in DC on February 1, 2011
Update February 13, 2011:
I ordered a Sakar teleconverter for a friend and I can confirm that it is pretty much the same as the Bower. The one I received said "Digital Concepts" on it but was distributed by Sakar. I will say that after doing this modification again that you have to have a pretty good Dremel and a sharp knife. I used the Dremel (with a small engraving bit) to cut the main donut out then I used my knife to whittle away the rest of the plastic until the EF-S lens fit inside (with a little play so as to not tear up the EF-S part of the lens) the hole I made. Also have to be very careful not to cut / break one of the screw posts on the teleconverter as it is pretty much the far limit of where you will have to cut. I can also confirm that you will have to move the teleconverter lens back some so that the EF-S lens will fit. Threads are tight, so be careful. I found it easiest to screw the lens back (using the lens cap as grip) making my adjustments and then re-tightening the lock collar.

Original Post:
First off, this should be a review for the Sakar teleconverter, but the shipper sent me a Bower so I am writing a review about that. They look similar in construction but I am not sure. If you have a Sakar, then the modification I list here might work but I am certain that it will work for a Bower teleconverter.

I did not want to spend $200 on a hit or miss teleconverter and decided to go cheap. Based on other reviews, both the Sakar and Bower did well with EF lens for the price so I decided to give it a shot. I have a Canon T2i with a EF-S 55-250mm lens (all of my lenses are EF-S).

If you have canon EF-S lens (I used a 55-250mm telephoto) and want a cheap teleconverter then this is a fairly easy mod and will not make any changes to you lens!
Read more ›
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8 of 8 people found the following review helpful By Robert M. Blasewitz on April 7, 2012
Verified Purchase
Converter has worked well with the lenses that I use, especially the 300mm. Reasonable price and quality is good. Appears to be a useful tool for some photo challenges.
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