1. First things first, I always heard from my seniors that the real image distance is lens distance multiply by crop factor.
Meaning: 50mm prime * 1.5 crop (d80) gives 75 mm
Does it mean I fix a 50mm prime but I am shooting at 75 mm?
2. Now I played around that distance and estimated on and off the viewfinder to find 50mm on my d80 viewfinder is about the same size as the real image. So why that difference between a 50mm and 75 mm when visual on and off the viewfinder it looks the same?
3. Another issue following up to the first 2 qns, so the seniors who told me about this distance *crop factor value told me, that is why I shoot an object through a viewfinder, its slightly different on what would appear on the preview lcd.
meaning: I zoom in to a petal of a flower, but the photo previewed is "expanded" outwards a little such that i see another petal.
Just before we stick this problem to crop factor again, i like to share something. I've done a little read up of d80 in dpreview and I found out it has a 0.95 viewfinder magnification factor. I find this magnification factor a more logical reason why my photos are "expanded" out wards a bit rather than the crop factor again.
Thus, I like a clear cut clarification between crop factor and magnification factor.
Cheers and thanks in advance! =)