Architect1776 Loc: In my mind

18-200 is APS C will mount and work but you will need to crop as it does not cover a FF sensor.
https://www.bhphotovideo.com/c/product/1176276-REG/tamron_afb018c_700_18_200mm_f_3_5_6_3_di_ii.html

70 300 works with full frame with no cropping as it covers the full sensor.
http://www.tamron-usa.com/product/lenses/a005.html

50-500 is also a FF lens so no cropping on a FF sensor camera.
https://www.bhphotovideo.com/c/product/682764-USA/Sigma_738101_50_500mm_f_4_5_6_3_DG_OS.html

MROAK Loc: NH now, MA adult life, NY child

Thank you everyone for the replies.

I also got great information to complement the information presented here from a Canon camera comparison topic. it has an excellent video which really helps amateurs like me understand the issues between crop sensor cameras and full frame cameras. Here it is: Not sure how people feel about Tony Northrup, but here is a pretty informative video on the practical differences of these cameras.
https://www.youtube.com/watch?v=sX_I9KPPdWY&feature=youtu.be

This helps me lean more toward the 7D based on the type of photography I do.

Jim

Architect1776 Loc: In my mind

7D is very good. I have it and am never disappointed.

PHRubin Loc: Nashville TN USA

I thought that was already stated by rcarol.

User ID

Well gentleman, don't fuss over it.
No need to "ask tamron" etc. Just go
by the rules, by common knowledge,
which "there's no such animal as an
18-200/18-300/18-400 for full frame
cameras". Done deal. No discussion,
no research, no muss no fuss :-)

.

Resqu2 Loc: SW Va

Look at the 6D series also, either the first or 2nd generation. I had a 6D and loved it, great entry level full frame camera.

amfoto1 Loc: San Jose, Calif. USA

The Tamron 18-200mm is a "Di II... crop only" lens. So it won't work on a full frame camera. Your other two lenses will work.

Not sure why you'd want a 5D Mark II. An 80D or 77D or T7i (all APS-C, same as your T3i) have higher resolution, faster frame rate, better AF system, higher usable ISO, Anti-Flicker and more.

Use 5D Mark II seem to be selling for between $600 and $750... "mileage" unknown. One place was actually asking $1500 for one! Others were cheaper, but in questionable condition.

80D is selling new for $999 (or $1400 with the excellent EF-S 18-135mm IS USM, which normally sells for $600 separately).

77D is selling new for $700 ($999 with EF-S 18-55 IS STM and EF-S 55-250 IS STM lenses).

T7i is selling new for $700 ($800 with EF-S 18-55 IS STM or $950 with both that lens and the EF-S 55-250 IS STM).

5D Mark II is 21MP was introduced fully ten years ago in 2008, shoots at close to 4 frames per second continuously and has a 9-point AF system (with 6 "expansion points" in AI Servo) with ONE cross type AF point at the center (two of the expansion points are cross type, too). The 5D Mark II's AF is good to a little better than -1EV light levels and is "f/5.6 limited", meaning that it can autofocus an f/4 lens fitted with a 1.4X teleconverter, but not with a 2X teleconverter. The 5DII has a top shutter speed of 1/8000 and 1/200 flash sync. The highest ISO I ever use on my 5D Mark II is 12800, but I try to keep to 6400 or below. It doesn't have Anti-Flicker (which solves exposure problems under fluorescent and similar lighting). It does have Micro Focus Adjustment and a self-cleaning sensor and HD video. It uses slow contrast detection AF in Live View and video mode. It has a true pentaprism for a nice bright, large 98% coverage viewfinder and a 3" 921K pixel rear monitor (fixed).

80D is 24MP and was intro'd in 2016, can shoot as fast as 7 frame per sec continuously and has a 45-point AF, all cross type, is able to focus as low as -3EV light and up to 27 of it's AF points are "f/8 capable", meaning that it can handle an f/4 lens with a 2X or an f/5.6 lens with a 1.4X teleconverter (the number of points able to focus an f/8 combo varies by lens). It has a top shutter speed of 1/8000 and a 1/250 flash sync. It's usable up to ISO 16000 (expandable beyond that, but questionable). It has Anti-Flicker, Micro Focus Adjustment, self-cleaning sensor, HD video. It uses Canon's Dual Pixel AF phase detection in live View and video, which is much faster than the earlier contrast detection method. It also has a true pentaprism for a large, bright 100% coverage viewfinder and an articulated, 3" 1 million pixel Touchscreen rear monitor. 80D has moderate sealing for weather resistance (5DII has more magnesium external panels and might have more sealing).

77D and T7i are very similar cameras, primarily just have somewhat different control layout and display. They both have the same 24MP sensor, ISO and AF system as the 80D, except these models don't have Micro Focus Adjustment. They have a lower specification shutter with top speed of 1/4000 and 1/200 flash sync (same as your T3i). They have Anti-Flicker, self-cleaning sensor and HD video. They also use Canon's Dual Pixel AF in Live View and video mode. They have electronic image stabilization in video mode (not in still photo mode). To save weight and cost both use a "penta mirror" with a 95% viewfinder (similar size and brightness as your T3i's). Both of them use an articulated rear monitor with same specs as the 80D {3" 1 million pixel Touchscreen). The difference between the 77D and T7i is that the 77D has an additional LCD display on the top right shoulder and controls similar to 80D. T7i has display and controls more similar to your T3i's. Like your current camera, these models have minimal sealing for weather resistance.

All three of these current APS-C models will probably work fine with all your lenses. One of the problems with third party lenses is that there are sometimes incompatibilities with newer cameras. Third party manufacturers reverse-engineer their lenses to work with current and previous cameras at the time they are made... so there's no guarantee they will work with cameras that are introduced later, if the camera maker's technology changes. Canon EF and EF-S lenses, on the other hand, will work on any of these APS-C cameras, regardless of the age of the lens. 5DII will work with all Canon EF lenses ever made (but not EF-S).

5DII is a nice camera... but it's getting pretty old now. I still have mine, but I use it less and less because more recent APS-C cameras have caught up with and surpassed many of it's capabilities. One of the main reasons I bought the 5DII was for it's low light capabilities. However I now can use my APS-C 7D Mark II's at even higher ISOs with similar or better results. And, unfortunately, Canon failed to upgrade the 5DII's AF system at all. The 7DII has MUCH higher performance AF (even higher performance than 80D, 77D, T7i. It's the same as what they used on the original 5D from 2005. Both 5D and 5DII AF is very similar in appearance and performance to your T3i's: 9-point with a single higher performance cross-type point at the center. The 5D/5DII actually have 6 more "hidden" focus assist points that can be enabled, but only work in AI Servo (moving subject tracking) mode, which is NOT the camera's forte. Those 6 add'l points don't appear in the viewfinder, but they basically make the entire spot meter circle in the center into one large AF point. Among other things, the 5D Mark III got a huge upgrade to it's AF system (61-points, f/8 capable, 41 cross type points).

5DII uses Compact Flash memory cards (all the above APS-C models use SD cards, same as your T3i). The 5DII and 80D use the larger LP-E6/E6N type batteries. The 77D and T7i use a smaller LP-E17, if I recall correctly. That's similar to the battery your T3i uses.

MROAK Loc: NH now, MA adult life, NY child

Wow great input, Thank you.
I was already leaning away from moving to full frame unless I could go to a newer and much more expensive camera body.
Jim