Canon EF 2X II Extender Telephoto Accessory Review

Will this get the same results as a dedicated 400/500/600mm prime lens..?
Nope.

Did I expect it to..?
Nope.

It's a great thing to leave in the bag for those times when 200mm is just not quite enough or you didn't feel like lugging the 300 f/2.8 (or longer) around.

OK, so it drops my 70-200 down to f/5.6 but I can live with that if it means the difference between getting a shot or going home empty handed.

The difference in sharpness in prints is only slight and only found IF you're looking for it. Most people will never see the difference. That said, care needs to be taken. Using a tripod is almost a must. (FWIW I use one a lot and for ANYTHING shot at 300mm or greater.) Hand holding a 400mm lens is a bit dodgy at the best of times IMO.

Most of the complaints I see for this are by people that either didn't take the time to check which lenses it will work on or figure that they'll get exactly the same results using a 70-200 f/4 (or lesser) as they would if they had chosen a fast 400mm in the first place. Not going to happen. Canon is very specific about which lenses can use this...and the body focus specs aren't exactly hidden either...

If you're looking for a quick and easy way to increase the reach of an already SHARP compatible lens then go for it. If you think you're going to get Canon 400mm f/2.8L performance for [...] bucks... Well, sorry but, time for a reality check.

So why 4 stars instead of 5?
I don't want to skew the results and make people think this is something that they must have or can't live without. IF you can use it, know it's limitations, and HOW to use it...well then it's a nice addition to the kit. OTOH, it's not the end all be all accessory that many people hope/wish/think that it is.

Like I said up top, it's a great thing to keep in the bag.

Buy it here now!