This is a horrible way to spend your money!! I got this lense but for how much money you spend (a lot) you dont get much back, sure for a while you can zoom in really far and see things like you have never seen them from a camera before but after a while even that ends up getting messed up...

zooms in far

images (after lots and lots of use) can be distorted..

The tripod mounting bracket is fully integrated into the main barrel and rotates rather cleverly internally after a locking knob has been released. There are click-stops at 90-degree intervals which makes switching orientations a lot easier from behind the camera.

Canon's EF 800mm f/5.6L IS USM lens is a 'big gun' in many ways. Weighing 4.5 kilograms and almost half a metre long with its lens hood attached, it's a challenge to shoot with. However, it also has a maximum aperture of f/5.6, which is outstanding for a lens with such a long focal length.

There is nothing like the arrival of a new Canon Super Telephoto Lens to bring the excitement of Christmas to any time of the year. And the hit on the credit card from this lens is considerably larger than the hit from most households' Christmas expenditures.

the pros of this lens are well documented in various on line reviews,all i will say is that its not cheap but its worth the money. you really do get what you pay for.its easy to manage thanks to its relative lightweight and it produces very sharp images for a super telephoto lens,F5.6 and F8 are the...

SUPERB LENS,VERY LIGHT,VERY SHARP AND EXQUISITE CONSTRUCTION

None really,F4 would be sweet but it would then weigh a tonne.

The arrival of the new Canon EF 800mm f/5.6L IS USM lens was a case of perfect timing as within a few days I'd be on the road for a couple of weeks photographing the abundance of wildlife at the Blackwater Refuge.

It's an excellent lens in every regard. Compared to the 200 f2L IS (which I have) it falls a bit short in the CA performance. But if you've used the 200L IS this is something you'll fuss about with every lens you use and unfortunately the 800L IS isn't immune to it.

Everything

Nitpicking a bit but CA

What can I say, superb image quality with ultra long reach The ultimate wildlife lens, lighter than the 600mm and it fits (just) in my AW Rover bag so I can take it as hand luggage Add a 1.4x on a 1d body and you have autofocus (centre only) to an incredible 1456mmm equivalent Expensive but you know...

Really brings distant wildlife up close. Birds in flight are fantastic.

Consistent Output; Fast / accurate auto-focus; Sharp; Strong Construction

Really brings distant wildlife up close. Birds in flight are fantastic.

Consistent Output; Sharp; Strong Construction; Fast / accurate auto-focus