Summary: Used on my 70-200 f4 IS and Canon 40D, this converter has given very good results. The trick is to use it with the 70-200 zoomed all the way out to 200. Used this way, the images are very sharp.
Pros: Lends flexibility to existing compatible lenses. Lighter than getting a dedicated long telephoto lens, great image quality.
Cons: Image quality degrades when lens is not at full telephoto - no zooming. Pricey!
Summary: Used with 'L' series primes this convertor works fantastically well, IQ and sharpness lose nothing from the standard lens. > A no brainer - just buy one if you use 'L' series primes > Doesn't work well with 'Hell' ZOOMs but hey Zooms are for snappers only, this convertor merely magnifies their shortcomings
Pros: Killer piece of kit for use with 'L' primes - You must have one
Summary: I already have the 2x extender and bought this one on impulse after hearing good things about it. I thought I would keep this and sell the 2x extender but now I am not so sure. Most people are under the impression that the 1.4x extender is far superior to the 2x. Technically that's probably true but only because it's logical. The greater the magnification, the greater the quality loss so the obviously the 1.4x should give better results.
Pros: Build quality, Optical quality, Water and dust resistance, Excellent resale value, Stackable with 2x extender, The best extender money can buy but not a substitute for a longer lens.
Cons: Even though it is top quality I still feel the price is just a tad steep
Summary: I have this TC mated to my 100-400L. There's nothing to complain at all here! The build is as solid as the best L lenses, it includes a weather sealing O-ring, and the image degradation is minimal. In fact, I have to squint hard between an image with and without the TC to even notice a difference at 100%(other than one being more magnified, that is).
Summary: Modest impact on image quality over the naked lens, especially for primes. My experience is generally that lens magnification of any type produces better results than enlarging in post processing.
Summary: I bought to use with my 100-400L. It is a high quality piece of glass but does noticebly degrade the image on that lens. I have used it on my 180mm macro with better results. I understand that it even works better with Canon super teles but have not tried it myself.
Cons: I bought to use with my 100-400L. It is a high quality piece of glass but does noticebly degrade the image on that lens. I have used it on my 180mm macro with better results. I understand that it even works better with Canon super teles but have not tried it myself.
Summary: Well over half of the images that I capture with my 300mm L f4 IS lens are made with the 1.4x Extender mounted. Any loss of image quality is very minimal. It is important to note that both AF and IS are maintained when I use this combination on my 20D. It is true that the AF does seem to take a little longer to find focus when the Extender is mounted but that has not been a big problem, even when photographing wildlife.
Pros: Greater reach with minimal loss of image quality.