Crop
factor and aspect ratio are two different animals.
Crop factor is a term used to describe differences among digital cameras because not all digital cameras have the same sensor size. With 35 mm film a 50 mm lens is a 50 mm lens. But digital cameras aren't like that. What is seen through a 50 mm lens on a crop sensor camera is not the same as what is seen through the same lens on a full frame camera.
Aspect ratio: if you are shooting a camera that has a 3:2 aspect ratio, then you are
exactly right, you can not make an 8x10 print without losing some of the original composition.
Here is more information on the terms:
https://en.wikipedia.org/wiki/Crop_factorhttps://digital-photography-school.com/aspect-ratio-what-it-is-and-why-it-matters/Since I owned a D90 and Now a D750 and have been shooting film since I was 18 and am now 71, I have had much experience. My D90 experience was FF and Dx both depending on the lens. But my FF is strictly FF lens. The D90 was 85% of field of view of the FF but it still did not give you what you saw thru the view finder. What I saw was less then what was taken.
The point is what you see in the view finder does match the results you get. They are automatically cropped in the processing. There is a difference from the 35mm and what is printed. I had go to several printers who would print the 35mm the way that it came out without cropping if I would have cropped the two people on the ends would have only been half a person with an 8x10, 16x20 and even a 16x24. The actual size of the print was 16x25.5. I just measured it. One can do what they want but I am trying to save some people some time and money.
Here is my experience and it suggests to allow for cropping on a FF camera.
That I understand. But what you are dealing with is what you have to work with originally. What happened to me is we took some photo at a family reunion and no cropping was allowed for so we could not do the 16x20 or other but I have pay extra to get a custom frame to actually fit the 35mm frame size. No big deal other than some figuring and extra expense. But then again there was actually another factor and that when it came to getting the prints made. I had to have custom lab make the photo and it was not standard.
If we would have allow for cropping that would not have been an issue either way, printing or framing. So what you just told me is that when you shoot you should allow for cropping and that is what I said.
Most labs that I visited, Costco, etc all wanted to print 16x20 and that simply would not work. I was lucky in my small town to find a printer that do what was required.
There are so many variables in photography and my experience tells me to allow. Why does it hurt to allow for cropping?
Crop factor and aspect ratio we can split hairs all day long but what matters in the end is the results that we have to deal with. I believe that is what the OP has been asking.
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Crop b factor /b and aspect ratio are two differ... (