10-30-2014 10:08 AM
Wow, a EOS RT, that is a blast from the past. It is a film camera you know, not a DSLR. It's mirror doesn't move when it takes a picture. It uses EF lenses, however, so if a lens fit it, it will bolt to a currect (T3i) DSLR camera.
The Canon EF 35-80mm 1:4-5.6 lens is on it's 3rd or 4th reinvention. I am guessing you have the original if it was for the RT.
But it should work on your T3i. They are OK so-so lenses.
My personal opinion of Promaster 'anything' is they are crummy. Not worth anything, not money nor time. That said with the proper version, which I would guess you have, it too will hook up to your T3i. Some folks sware by them and some folks sware at them. They are not for me.
10-30-2014 06:40 PM
My personal opinion of Promaster 'anything' is they are crummy. Not worth anything, not money nor time. [...]
While I'm sure you're correct regarding Promaster lenses, I have a set of Promaster Digital Extension Tubes that are well built and work flawlessly.
10-30-2014 08:26 PM
11-02-2014 10:27 AM - edited 11-22-2014 10:33 AM
A friend of mine gave me a Canon EOS Rt with a promaster 100-400mm AF F4.5-6.7MC lens and a Canon EF 35-80mm 1:4-5.6 lens. Will these lenses work with my canon Rebel T3i?
Becaue the Promaster 100-400mm is f/6.7 at the long end, it might not auto focus on the T3i. Generally you need f/5.6 or faster for AF. There is also a good chance the aperture control will cause a camera error if you shoot stopped down. This is pretty common error with old 3rd party film era AF lenses.