My 70-200mm f4 IS is marvelous!Why canon d'ont do a 200-600mm F5.6is with same IQ??

They did.

chouette wrote:

depends on if you can afford it

Don't expect such a lens to be anywhere near as hand-hold-able. The front element needs to have 4.5x the area; the lens needs to be longer, etc. Even a 600/5.6 DO prime, would be as big and as heavy, or a little more so, than a 400/4 DO with a 1.4x TC, and add to the zooming, and you're looking at something at least 7 pounds, minimum.

What I wonder about is whether Canon will eventually start making lenses slower than f/5.6, as AF ability at higher f-numbers improve, especially with mirrorless cameras with EVFs.

A 200-600/5.6-8.0 zoom could be very hand-hold-able. Even f/7.1, if they break from their whole-stop silly standards.

John Sheehy wrote:

Don't expect such a lens to be anywhere near as hand-hold-able. The front element needs to have 4.5x the area; the lens needs to be longer, etc. Even a 600/5.6 DO prime, would be as big and as heavy, or a little more so, than a 400/4 DO with a 1.4x TC, and add to the zooming, and you're looking at something at least 7 pounds, minimum.

What I wonder about is whether Canon will eventually start making lenses slower than f/5.6, as AF ability at higher f-numbers improve, especially with mirrorless cameras with EVFs.

A 200-600/5.6-8.0 zoom could be very hand-hold-able. Even f/7.1, if they break from their whole-stop silly standards.

would that be a "L", EF or just an EF-S zoom? makes a big difference! looking at Tamron and Sigma, and nikon it can be achieved (150-600mm) but it will be just a matter of economics for canon!

Canon did, it is called EF 200-400mm f/4L IS USM Extender 1.4x!

Will T wrote:

Canon did, it is called EF 200-400mm f/4L IS USM Extender 1.4x!

true, but they didn't make it easy on the wallet, though

1Dx4me wrote:

John Sheehy wrote:

Don't expect such a lens to be anywhere near as hand-hold-able. The front element needs to have 4.5x the area; the lens needs to be longer, etc. Even a 600/5.6 DO prime, would be as big and as heavy, or a little more so, than a 400/4 DO with a 1.4x TC, and add to the zooming, and you're looking at something at least 7 pounds, minimum.

What I wonder about is whether Canon will eventually start making lenses slower than f/5.6, as AF ability at higher f-numbers improve, especially with mirrorless cameras with EVFs.

A 200-600/5.6-8.0 zoom could be very hand-hold-able. Even f/7.1, if they break from their whole-stop silly standards.

would that be a "L", EF or just an EF-S zoom? makes a big difference! looking at Tamron and Sigma, and nikon it can be achieved (150-600mm) but it will be just a matter of economics for canon!

I was assuming a lens the quality of the L and DO series. Those 600mm 3rd-party zooms are not as rugged or as sharp wide open (although they're fine when you fill the frame and don't have to crop much).

John Sheehy wrote:

1Dx4me wrote:

would that be a "L", EF or just an EF-S zoom? makes a big difference! looking at Tamron and Sigma, and nikon it can be achieved (150-600mm) but it will be just a matter of economics for canon!

I was assuming a lens the quality of the L and DO series. Those 600mm 3rd-party zooms are not as rugged or as sharp wide open (although they're fine when you fill the frame and don't have to crop much).

They are very good in relative (price/performance) and absolute terms. If you want ruggedness there's Sigma S or a little less Tamron G2. If you want hand holdable lens there are all light enough. Sigma S maybe the only exception.

Here's one shot from my terrace few moments ago. Sigma C hand held and wide open.