Superfine Optics, Built Quality, Water and Dust Res., Just a Superb Converter...

NOTHING....

Superb quality pictures with my Canon EOS 350D and Canon EF 70-200 f/4 IS USM (In DAY photography only)....

No problem at all.

Customer Service

Not Req.

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Build quality
Fair price
Water resistant and dust proof
Maintains AF and IS on lenses f2.8 and faster
Stackable with 1.4x extender
Optically excellent. Quality loss is inevitable with this product but it is very good.
Secure mounting to camera and lens with no lens sag.

None. It does exactly as it says on the box.
If you expect the impossible you'll be disappointed.

I wanted a professional quality zoom lens that would not only be suitable for wildlife but also general telephoto purposes. I opted for the Canon 70-200 f2.8L IS USM instead of the 100-400 f5.6L. When the 70-200 is coupled with this 2x extender it becomes almost theoretically identical to the 100-400 lens. Although you lose 2 stops of light you still retain autofocus and IS with the f2.8 lens. I also have the benefit of using the lens without the extender for closer subjects. I had heard so much bad press about the 2x extender compared to the 1.4x that I was a little worried about its performance.

I am pleasantly surprised with the results after testing it. Yes there is quality loss but if you're expecting no quality loss then you're a complete idiot. Also, if you're expecting it to perform as well as the 1.4x extender then you're also a fool. More magnification means more demand from the optics therefore the 2x will always be inferior to the 1.4x.

The images are more than usable. They are actually very good indeed. What a lot of photographers seem to forget is that atmospherics also affect images. An image from the long end of a 400mm zoom will always struggle to match that of a 200mm purely due to the extra magnification. You not only magnify your subject, you also magnify the hazy atmosphere hence softer images. This is even more apparent on SLRs with APS-C sensors as there is greater magnification.

Remember that this extender only works on L series optics! The front element protrudes too far to be used on the consumer lenses.

I tested the optics by taking a series of shots of chimney pots from the top window of my house. I took some shots without the extender with the zoom set at about 140mm. I then attached the extender and took the same shots with the zoom set at 70mm (effectively 140mm with extender taken into account.) This way, both shots were framed the same, one with extender one without. Yes, you can tell the difference but it isn't really that bad. The shot with the extender is still nice and sharp with decent contrast and if you didn't know you'd used an extender you'd be perfectly happy with it.

I also took a few shots at full zoom with the extender attached. Also, as my camera has the APS-C sensor I was effectively using a focal length of 640mm. Images were defintely softer but we're talking 640mm here! They were still good though which is the main concern. A 640mm f5.6 lens retaining AF and IS is very good going in my book. It's also perfectly hand holdable in most circumstances. Imagine hand holding a 600mm prime lens on an EOS 5D!!! Virtually impossible.

This extender is good on the cheaper APS-C cameras and I bet it's fantastic on the EOS 5D and 1Ds. If you want one, buy one. If you really don't like it then sell it on eBay and you'll get 90% of your money back anyway.

Build quality is the same as the L series telephotos... superb. Metal construction, water resistant and dust proof with rubber seals. Couldn't be better really.

I would question its value on lenses slower than f2.8 as autofocus would be lost. OK for emergencies in those cases.

Customer Service

Not needed

Similar Products Used:

Teleplus 2x converter (Whoo... one to avoid at all costs!)

well build. Good glass. No signs of CA issue.

Need good primes to get sharp pictures

What people don't understand is that TC only works will with Great lens.
Obviously, most of the Canon lens is just so so at wide open even the 200mm 1.8.
However, the 400mm 2.8 and 300mm 2.8 are different story.
They have much better contrast and sharpness at wide open.
I have use this on my Canon 5D with Leica APO Summicron R 180mm F2 lens and the result is stunning good. Looks sharper and more contrast than the Canon EF 300mm 2.8 @ wide open.

Similar Products Used:

Kenko pro 300 DG 1.4 X. Tamron 1.7X TC. Tamon SP 1.4 X Tamron SP BB 2X

It goes to 520mm with my Eos 1D (1.3x multiplier). Not Bad...

All..yes.. I mean ALL the pictures taken are VERY GRAINY and NOT SHARP!! Very very disapointed... Better take the shots with regular lens and crop it..and it will still show much sharper image!

I bought this extender for use with my EF 200mm f/1.8

Customer Service

Not needed..I sold mine already =)

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I will never buy any extender anymore..Go with the longer lens for quality sake!

optical performance, build quality

None

The build quality is excellent. Results are first class.

Customer Service

Not Required

Similar Products Used:

None

Improved optical performance, build quality, ergonomics,

none

The build quality of this new version is excellent. Larger diameter than old version with weatherproofing ringss designed to match the new IS supertelephotos. You can also stack another converter behind the 2x without an extension tube. Compared to my old original version of the Canon 2x I feel this version is sharper with less light falloff in the corners. I now shoot the 2X on my 600mmF4IS and 300mmF2.8IS with the same confidence I used to have with the 1.4x. I also have used the new 2X and 1.4x stacked on my 600mm (1680mm) with publishable results.

Customer Service

CPS service is excellent

Similar Products Used:

Canon EF2x series 1

Full metal built

Contrast and sharpness loss

Expensive but firmly-built teleconvertor. A little soft and loss of contrast and only usable to certain "L" lens

Customer Service

N/A

Similar Products Used:

Kenko 2x TC