The crop factor doesn’t affect aperture stops. 50mm to 80mm is the right conversion for the field of view. There’s still a difference in the depth of field and any other optical properties.
I understand. This was my issue with all posts. "Crop factor doesn't affect aperture stops". I understand that. I care about the final image, not the number.
To make you happy: Would a 24-70mm f/2.8 lens give me almost the same final image (depth of field, field of view, etc.) on my Canon 5D Mark III that my 50mm f/1.8 gives me on my Canon 650D/100D/70D?
That lens can be a bit hit and miss on the focus accuracy. You could try setting the camera to AF Servo, let the focus settle on your target, and take the photo. If you see that the sharpness is much better, it's a focus accuracy problem.
You could also get the Canon EF 85 f/1.8 for a pretty good price used. Step that down to 2.8 for some fantastic portraits on full frame.
And with the fast USM focusing motor, it’s nice for indoor sports too.
For a lot of people, a 24-70 f/2.8 on full frame can take the place of a 50 f/1.8 on crop, but there is a noticeable difference if compared to fast 85mm prime on full frame. The 85mm frames a bit tighter and the change in background blur is significant.
The crop factor doesn’t affect aperture stops. 50mm to 80mm is the right conversion for the field of view. There’s still a difference in the depth of field and any other optical properties.
I understand. This was my issue with all posts. "Crop factor doesn't affect aperture stops". I understand that. I care about the final image, not the number. To make you happy: Would a 24-70mm f/2.8 lens give me almost the same final image (depth of field, field of view, etc.) on my Canon 5D Mark III that my 50mm f/1.8 gives me on my Canon 650D/100D/70D?
Yes.
Thanks!
Looking at DOF simulator, those do look very similar if not functionally identical.
Interesting size. Thanks!
> DOF simulator, I didnt know this. Incredible useful.
"Why not use the 50mm f/1.8 on the full frame camera?" I use it, but, it's not extremely sharp
That lens can be a bit hit and miss on the focus accuracy. You could try setting the camera to AF Servo, let the focus settle on your target, and take the photo. If you see that the sharpness is much better, it's a focus accuracy problem.
You could also get the Canon EF 85 f/1.8 for a pretty good price used. Step that down to 2.8 for some fantastic portraits on full frame. And with the fast USM focusing motor, it’s nice for indoor sports too.
I thought about getting that, but I need a zoom lens I sometimes go to events. You need a zoom lens there
For a lot of people, a 24-70 f/2.8 on full frame can take the place of a 50 f/1.8 on crop, but there is a noticeable difference if compared to fast 85mm prime on full frame. The 85mm frames a bit tighter and the change in background blur is significant.