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The 1.4X II teleconverter is a modest update to Canon's earlier 1.4X TC. The imprint II allows this extender to be stacked with another of Canon's extenders (either another 1.4X II or the 2X II) without having to separate the two with an extension tube (although the loss of sharpness from stacking extenders may not be acceptable to you) . Otherwise, the quality of the newer 1.4X II is supposed to be very similar to the older model, which I've never owned.
The 1.4X II is a big arrangement to extend the approach of compatible lenses. Stamp that not every Canon lens is compatible with this extender. The following is from Canon's Web site: "This tele extender can be mature with fixed focal length lenses 135mm and longer (except the 135mm f/2.8 Softfocus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/4.0L, and 100-400 f/4.5-5.6L IS zoom lenses."
I consume it frequently with my Canon 70-200mm f/2.8L IS, which turns it into a 98-280mm zoom. The extra advance it adds is not vast, but it's very welcome when I fair need a puny more than what the lens alone can give me.
I've found no appreciable loss in sharpness from using the 1.4X. Of course, any extender is going to nick sharpness to some degree, but with normal examination, I can't distinguish photos taken with the 70-200mm that exercise the 1.4X from those that don't. The fact that the 70-200mm f/2.8L is a very attractive lens to launch with helps in this department.
Using the 1.4X decreases your lens' widest aperture 'capability' by one cessation. With some lenses, that can be more distinguished than it appears on the surface; when using a non-pro Canon body (such as my 20D) the lens must have a minimum wide-open aperture 'capability' of f/5.6 for autofocus to work. The lens doesn't have to be space at f/5.6, it unbiased has to be 'capable' of at least f/5.6 after adjusting for the one halt loss from the 1.4X. That means with some camera/lens combinations, adding the 1.4X will force you to focus all of your shots manually. (Note: There is a known 'fix' for this that restores autofocus. I've never needed to try it, but it involves taping over some connector pins on the 1.4X to fool the camera body. Depart with caution if you try this, and do a Google search to learn how to do it correct before attempting it.)
The 1.4X also reduces focus hasten very slightly. I've only broken-down it on my 70-200mm IS, which has Canon's USM and is a fast-focusing lens to launch with, but the decrease in hasten is so petite I really don't discover it. And it does not affect IS (Image Stabilization) at all.
The 1.4X is built to the quality of Canon's L-series lenses, which means that it is weather sealed and will preserve a Canon pro body and L-series lens weather sealed when ancient with them.
If you're considering this extender, you're probably also considering Canon's 2X II teleconverter. I do not have the 2X but did a lot of research on it before ultimately deciding to go with the 1.4X. The 2X decreases your aperture by two stops, and is reported to have a noticable decrease in sharpness--more than some photographers are willing to live with. On the other hand, I've never read a review that complained about the loss of sharpness from the 1.4X.
If you've already invested a lot of money in telephoto lenses, the 1.4X II is a relatively inexpensive plot to find even more approach (and value) out of your investment while adding only a modest amount of bulk to your camera bag. Highly recommended.
I have both the 1.4x and 2x teleconverters from Canon. Neither, despite what people say, produces an image that objective as animated as the unusual lens. But images through the 2x are noticably poor from even a casual inspection while images through the 1.4x contain up very well. Carefully controlled test shots are the easiest method to really glance the problems in this converter. But for the most piece the 1.4x won't be a liability in sharpness.
The 1.4x loses one close of light. So while this does work on a 100mm-400mm f/4.5-5.6 IS L lens, I wouldn't reccommend it. Build this for the 200mm f/2.8 L, and the 300mm f/2.8 IS L, and any bigger primes you have.
I have ancient the 1.4x II extender for over a year. It gives me fabulous detail with my 70-200L f/4 lens on a 20D. I employ it mostly for wildlife and butterflies. Inequity is noble with colors that pop. When shooting on a sunny day the shutter speeds are smooth rapid with the f/5.6 and the background is blurred beautifully. In shade areas and obscene light a tripod is a must! There hasn't been any sacrifice in subject detail. I can discover individual hairs on butterfly bodies even when shooting wide initiate. This is a stout diagram to glean closer without paying a well-known amount for a supertelephoto lens.
