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Bower MC4 2X AF Teleconverter for Canon EOS EF Lenses - Bower SX4EOS |  | Brand: Bower
Category: CE
List Price: $149.99
Buy New: $75.00
as of 9/5/2010 06:30 PDT details
You Save: $74.99 (50%)
New (4) from $75.00
Seller: Xtreme Accessory
Rating:  10 reviews
Color: Black
Shipping Weight (lbs): 0.4
MPN: SX4EOS
Model: SX4EOS
UPC: 636980500171
EAN: 0636980500171
ASIN: B000J6AVQ8
Availability: Usually ships in 1-2 business days
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| Features:
| • | 2x autofocus teleconverter/extender for Canon EF lens system | | • | Magnification: 2x | | • | Optical Construction: 4 elements in 4 groups | | • | Fully Multi-coated, automatic diaphragm coupling | | • | Made in Japan, Lifetime Garantee |
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| Editorial Reviews:
Product Description
Bower MC4 2X AF Teleconverter for Canon EOS EF Lenses - Bower SX4EOS
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| Customer Reviews:
Showing reviews 1-5 of 10
 Piece of crap August 15, 2010
that guy with the camera
I usually don't like to write poor reviews. But this really requires it. I was OK with the idea that the focusing was poor in low light. However, I can never use autofocus with this extender. It simply won't work. And while I was expecting some degradation in quality of the image, practically all pictures using this are unusable. I would not recommend it.
 Excellent Price, fast delivery!! Excellent for Canon EOS July 27, 2010
T. Snoddy (Julian, CA)
Thanks to all who previously wrote reviews listing information about this lens converter for Canon EOS digital. I really needed and wanted a 2x converter for my Canon Rebel XT to use with my 75-300 telephoto lens. I got conflicting information prior to coming to Amazon site. Previous comments really helped!! I am very satisfied with this product. Like it stated you have change two f-stops - but hey - using the camera on manual is the only way to go. The converter is auto-focus so no problem. Great photos!! Bower is a local company in the USA with products made in Japan, what else is new.!! Thanks!!
Bower MC4 2X AF July 17, 2010
L. Freel
1 out of 1 found this review helpful
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.
Auto-Focus is unpredictable with this December 15, 2008
MalibuJack
3 out of 4 found this review helpful
I have had this teleconverter for several years. It does work, however as others have mentioned, autofocus is troublesome. Every auto-focus lens I have tried will endlessly hunt if your in medium to low light situation and you ultimately have to manually focus. Previous reviews have explained "why" it happens, however it also slows down an otherwise fast autofocus lens in bright daylight which limits its use. One thing I did notice is if you get everything just "right" the images still are not as sharp.
I would recommend using a different name-brand teleconverter.
 Mounting Problems for EFS lens November 19, 2008
Michael T. Blakley
8 out of 12 found this review helpful
The Bower tele-converters work only on Canon's EF lenses. It will not work on the Canon EFS lenses. There's a difference in the way the EF and EFS lenses are made. The Canon camera body will accept both EF and EFS lenses, but Bower tele-converters only accept the EF lenses.
Also, I am trying to get the Bower converter to work with a Canon EF 50mm f/1.8 on my EOS Rebel XSi. But I'm having very limited success.
The auto-focus will not work. The camera searches and searches, but to no avail. It must be manually focused. And that's a big pain because the ring you must hold in order to manually focus the lens is tiny and I end up touching the lens filter about half the time.
If I could get my money back on the bower tele-converter, I would.
Showing reviews 1-5 of 10
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