Same exposure settings on 2 different DLSRs (Canon SL1 and 70d) created differently exposed image? I recently purchased a Canon SL1 as a second camera to my Canon 70d. Today I had my first shoot, and I noticed something weird with the exposure. Both of my cameras were set to 1080 24fps, 50 shutter speed, 2.8 aperture, and ISO 200. However, the Canon Sl1 was underexposed. To create the same exposure as the Canon 70d, I needed to bump the SL1's ISO to 400. Shouldn't camera's with the same settings reproduce a similarly exposed image?

Thanks!
-Wes
Simple answer is No.

Now to be a little more technical. It is all down to build, sensor type, style, size etc and of course the camera being stuff like, consumer, semi-pro, professional etc.

A little more.
Cameras like the SL1 which would be classed as consumer would not have the same build or sensor quality as a professional or possibly semi-pro same goes for sensor sizes etc.

I have a Canon 7D and a Canon 100D both of which I can use but I have to expose slightly differently on the 100D due to it being a lesser quality camera, even though it has basically the same sensor and specs (which is why I bought it). Most things you can correct it in post as long as I've thought about a little bits before hand.

This would also be the same for the built in colour profiles in the camera. Which  is why a lot of people start to build there own or put on preset ones like cinestyle.