Panopeeper wrote in post #6899409
The two most important factors in this relation, the pixel size and the image quality vary more than any other consideration.
I disagree with this pretty much in totality.
Do you think it is reasonable to throw a 50D with a 350D together, simply saying that both are cropping cameras?
Yes I do. 100% so for a simple discussion on DOF which is what the OP was asking for.
And beyond that.....the difference in IQ between all of the various 1.6X sensors made by Canon have been more alike than different.
I think you would be hard pressed to show a huge difference in IQ between those two bodies....let alone showing a difference in DOF!
Are you really suggesting that the 50D will deliver a significantly different DOF given normal (say 8x10) print sizes?
Beside the number of pixels, the image quality (how clean the pixels are) is important. This decides, how much they can be enlarged or have to be reduced for a certain type of presentation. Don't you see a difference between the pixels of a 10D and a 40D in this relation?
No, I never have. I've never seen a difference in DOF between them to be very clear and on the point of this thread.
Wandering off topic and to be quite honest I never saw an IQ difference at all between the XT, 30D and 40D bodies I owned.
So, what is the point of categorizing the cameras in FF and cropping? There is only useful aspect, namely that the cropping cameras are using the "cream" of the projected image, i.e. the sharpest part with the least aberrations. This aspect did not come up here (and this too can not be assigned to cameras; this comes from lenses).
1. What does this have to do with relative DOF?
2. What happens to that 'cream' of the image when you enlarge the image 1.6 times as much to make the same print?
Ultimately, the unit of digital photography is the PIXEL. In order to compare two images of whatever camera for whatever purpose, the easiest way is to express them in terms of number and quality of pixels; the result can be converted in whatever presentation you want to see.