Upload & Sell: Off
| p.1 #5 · p.1 #5 · 7D outresolving my Tam 28-75, Should I get a 6D? |
A full-frame camera will bring full-frame glass to life for that reason, but keep in mind that if your Tamron isn't sharp into the edges and corners, which are cropped off with your current cameras, then the 6D will show that pretty clearly. It's one reason I was fairly careful not to pick up lenses that weren't sharp edge to edge when I was shooting crop.
One other thing to try, though, is to test the two cameras side-by-side and then output the images to the same final size, and see if you can really tell the difference. At 1:1, the XTi should definitely look better at low ISOs and with good light, but when rendered to the same size the 7D should take the lead.
As for going to the 6D- well, I'd consider selling both cameras if you don't need the 7D's AF, that's the only reason to own it, as used prices are still lower than 70D new prices. But test your 7D a little more first.
Also, that 6D, while not inconsequential, is smaller and lighter than your 7D; might test the WAF in store if you can .