A:AnswerABSOLUTELY! I was in the same boat- I just upgraded from an OLDER Rebel- The Rebel XT.
NO issues.
The 70D can use any EOS system lens, be it EF or EF-S. In fact the 'kit' lens on the 70D is still going to be of the EF-S line.
I personally already had the following lens from my Rebel as I added them over the years:
EFS 55-250
EF 50 F1.4 prime
They work just fine with no worries. Just line up an EF-S to the 'white box' and the EF lesn to the 'red dot' when attaching to the camera.
A:AnswerI have taken several videos with this and can hear things very well on the video so it must have a built in microphone. However if you are making movies with it where you need each word said with absolute clarity at a distance from the camera I would suggest an external microphone
A:AnswerIt is a good camera, but if you are wanting a better portrait camera I would go full frame I am very happy with my 6D and the prices have been coming down due to new models being released with more expansive video and focus features.
A:AnswerIt's not as bad as some of the other canon models on the market but not the absolute best out there. I am happy with the results I get from it in low light. I would also suggest a ring or hot shoe flash if you are shooting people or anything moving
A:AnswerThe 0% interest deal is with the bank they associate with. I highly doubt they'll be able to convince AMEX to not have an interest rate on a purchase.