What to do

[Homer]

Have 6D and 7D
EFS 10-22,EF 40, EF 24-105, EF 70-200 F2.8 IS II and EF 400L 5.6


Keeping 6D and 24-105L. I shoot mostly landscapes with the 6D and wildlife with 7D.
Will be upgrading the 7D to 7D mark II
Need opinion on lens choices


Get rid of
EF 10-22 and get 16-35F 4.0 IS
EF 70-200 F2.8 IS II and EF 400 F5.6 and get new EF 100-400 II


Must say the 70-200 IS II F2.8 has been my most used lens and my favorite.
Been very happy with the EF 400 F5.6 as tach sharp, built in lens hood and very light. But I find I need variable reach and IS. Do I keep the 400 just for the 6D?


\clickon

[Sean Setters]

Get rid of
EF 10-22 and get 16-35F 4.0 IS
EF 70-200 F2.8 IS II and EF 400 F5.6 and get new EF 100-400 II


Get rid of...
EF 10-22 and get 16-35F 4.0 IS - Yes, I think that makes sense. The L-lens will give you a similar angle of view with the 6D as the EF-S lens on a crop sensor body, but image quality will be better and you'll get the benefits of IS.
EF 70-200 F2.8 IS II and EF 400 F5.6 and get new EF 100-400 II - Actually, I wouldn't advise getting rid of your most-used and favorite lens. Instead, you might try selling the EF 400mm f/5.6L USM and purchasing the 2x Extender III to tide you over until you can save up enough money for the EF 100-400mm L IS II. :-)

[peety3]

Have 6D and 7D
EF-S 10-22, EF 40, EF 24-105, EF 70-200 F2.8 IS II and EF 400L 5.6

Keeping 6D and 24-105L. I shoot mostly landscapes with the 6D and wildlife with 7D.
Will be upgrading the 7D to 7D mark II
Need opinion on lens choices

Get rid of
EF-S 10-22 and get 16-35F 4.0 IS
EF 70-200 F2.8 IS II and EF 400 F5.6 and get new EF 100-400 II

Must say the 70-200 IS II F2.8 has been my most used lens and my favorite.
Been very happy with the EF 400 F5.6 as tach sharp, built in lens hood and very light. But I find I need variable reach and IS. Do I keep the 400 just for the 6D?

I think the 10-22 -> 16-35/4IS is a guaranteed win. That's a direct replacement of the same effective FL.
However, I'd be hard-pressed to ditch the 70-200 for anything. Too much of a workhorse. I certainly think that you shouldn't keep the 400 just to put on the 6D...either the 7D2/70-200 does what you need, or you put the 70-200 on the 6D if there's something the 7D2 can't do and you crop as needed.

[jamsus]

Get rid of...
EF 10-22 and get 16-35F 4.0 IS - Yes, I think that makes sense. The L-lens will give you a similar angle of view with the 6D as the EF-S lens on a crop sensor body, but image quality will be better and you'll get the benefits of IS.
EF 70-200 F2.8 IS II and EF 400 F5.6 and get new EF 100-400 II - Actually, I wouldn't advise getting rid of your most-used and favorite lens. Instead, you might try selling the EF 400mm f/5.6L USM and purchasing the 2x Extender III to tide you over until you can save up enough money for the EF 100-400mm L IS II. :-)

Quote

[Kayaker72]

Hey Homer...

I have to agree with the others. I think you will see an upgrade switching your UWA lens from crop to FF, so I would trade up from the EFS 10-22 to the EF 16-35 f/4 IS.

I also agree that I would not part with the EF 70-200 II, especially since it is your "most used and...favorite" lens. Keep that.

But, I understand the desire for more reach. It is something I worked on improving and why I jumped on the Sigma 150-600S when it was released. It is also why I have not sold the 150-600S despite the stellar reviews of the 100-400 II. The thing that sometimes kills me is the reports that the 100-400 II plus 1.4xTC is has good AF and IQ. But, then, I am adding the 1.4x TC to the Sigma sports to get 840 mm and it is AFing reasonably well. The IQ takes a hit, but my jury is still out as I just replaced the TC (massive back focus issue) and haven't yet tested the new combination.

So, I agree with the recommendations above, but want to add, if you need more reach, consider the Tamron 150-600 or the Sigma 150-600 "Sports" or "Contemporary." I would let the reviews flow in on the Contemporary before buying, but the Sports has been very well received (http://sigma-rumors.com/2014/10/sigma-150-600mm-f5-6-3-dg-os-hsm-sports-reviews-sample-images/).

I have now shot with both the Tamron 150-600 and the Sigma 150-600S. Both can give very good IQ at 600 mm. The primary differences I saw was in size/weight (Sigma Sports is bigger/heavier), AF, and bokeh. I thought the Sigma AF'd both faster and more consistently and had more pleasing bokeh.

Both, I was seriously impressed with both.

So, if you want more reach, consider the 3rd party lenses. Someday I want a big white lens. But for now, the Sigma will work.

A few sample images I took:

Tamron 150-600
(heavily cropped and the lighting isn't the best)
https://farm9.staticflickr.com/8635/16370897131_2108ec51a1_b.jpg (https://flic.kr/p/qWD8n6)small-4687 (https://flic.kr/p/qWD8n6) by kayaker72 (https://www.flickr.com/people/70039618@N08/), on Flickr

https://farm9.staticflickr.com/8644/16185241360_e1c912d9db_b.jpg (https://flic.kr/p/qEeAnw)small-4729 (https://flic.kr/p/qEeAnw) by kayaker72 (https://www.flickr.com/people/70039618@N08/), on Flickr

https://farm8.staticflickr.com/7404/16441835852_b67c285d59_b.jpg (https://flic.kr/p/r3UGYu)small-4786 (https://flic.kr/p/r3UGYu) by kayaker72 (https://www.flickr.com/people/70039618@N08/), on Flickr

Sigma 150-600S

https://farm8.staticflickr.com/7332/15767990403_c4fdd7dc0b_b.jpg (https://flic.kr/p/q2n5cv)small-5664 (https://flic.kr/p/q2n5cv) by kayaker72 (https://www.flickr.com/people/70039618@N08/), on Flickr

https://farm8.staticflickr.com/7362/16186404459_6c2c992b0b_b.jpg (https://flic.kr/p/qEky7X)small-5350 (https://flic.kr/p/qEky7X) by kayaker72 (https://www.flickr.com/people/70039618@N08/), on Flickr

https://farm8.staticflickr.com/7557/15345010374_0c2deb1dec_b.jpg (https://flic.kr/p/pnZbYo)Small-3170-2 (https://flic.kr/p/pnZbYo) by kayaker72 (https://www.flickr.com/people/70039618@N08/), on Flickr

I actually have a ton more, but need to get back to post-processing that trip.

Bottom line, I wouldn't put them up with the big whites, but they are a way to get more reach cost affordably.

Good luck