As represented above, Canon offers a huge range of prime (fixed focal length) lenses. Options range from ultra-wide angle through super telephoto and from tilt-shift through macro. There is a lens for practically every need included here.

The 2x converter is excellent when you need some extra reach. I use with the 70-200mm 2.8 when I need extra reach, but still need the shorter minimum...

Excellent image quality

nothing

I really enjoy shooting with this attached to my f2.8 80-200 lens. The only sadness is that it is limited to f 5.6. This is not a problem in the sun or other bright circumstances but is a problem with low light - especially when hand holding the shot

Very good to keep in the bag and great for turning a 300 f2.8 into a 600 f5.6 but with limitations. If you don't need to crop then its fine. If Canon made a 1.7x I would have bought that, knowing how good the 1.4x is. Overall pretty good but if you want long lens quality, buy the ￡￡￡￡￡ lenses.

Durable; Lightweight

Looses Some Image Quality

This is the second Canon 2x extender I've had. I use this with a full frame Canon 5D Mark III and find it remarkable for getting closeups of people in day-to-day activities, sports, and closeups of flowers and of wildlife (e.g., elk and bison in Yellowstone National Park).

Consistent Output; Durable; Fast / accurate auto-focus; Nice Bokeh; Rugged; Strong Construction

Heavy

Fantastic replacement to an expensive lens but the lens is expensive for a good reason. In almost every camera, the auto focus stops working with the 2xiii. So unless your eyesight is 6/6 unlike mine, chances are that not every shot you take will be sharp. With a loss of a couple of f stops too.

Very.co.uk said delivery would be about 6 weeks, but this arrived within a week, so very impressed by this. I attach this to my 70-200mm f2.8 is 2 lens to get 400mm and the quality surpasses expectations, considering I would have to pay two grand for a 400mm lens outright.

Outstanding images with this in conjunction with my 300mmF2.8L. Frustrating that it does not work with the 100-400 F4.5L ll USM, while it did work with the original version of this lens, (although this was not consistent). I also own the 1.4x extender.

This is a superb extender which works flawlessly with the Canon prime telephoto and super telephoto lenses. I bought it to supplement my Canon 300 mm f/2.8 IS II lens to give me an effective 600 mm f/5.6.

Very cost effective way of increasing your telephoto reach; It's very light and compact

Loss of two stops of light compared with the mated lens

Not much really

A bit of a nuisance to keep putting in on - and then you have to focus manually; which resulted quite often in poor quality photos