yarinkel

<p>-No conversion factor, therefore, lenses used at what they are developed for (a 50mm is a 50mm, not a 75mm). Given the SLR design (mirror in the path), it is easier to design good normal/telephoto lenses than good wideangle lenses (there rangefinders have the design advantage, see Leica for instance).<br />The wider the lens, the more difficult the design becomes and compromises have to be made. By using a crop camera, because of the crop factor ultra-wide becomes wide, wides become normal, normal becomes short telephoto, etc...<br>

<br />With full-frame you got access to the native focal length of the excellent Sigma 12-24mm (spectacular at 12mm on full-frame, whereas the widest APS-C 10mm lenses are equivalent to only 15mm on a crop camera), the excellent Canon 16-35mm or 17-40mm F4L, the superb and versatile 24-105mm, etc...<br>

<br />- With bigger pixels on a full-frame, there is less diffraction effect: You can stop down your lenses more if you wish.<br>

<br />- Shallower depth of field if you open your lenses, great to throw background out of focus to isolate your subject<br>

<br />-When owning full-frame, you buy full-frame coverage lenses. This is a good investment for quality photography, as a larger sensor will always have the edge over a smaller one (you will always be able to put more pixels on it without increasing the noise). Aditionally, full-frame lenses work on all bodies (crop and fullframe), APS-C do not.<br>

<br />-Bigger pixels, therefore better signal-to-noise ratio. Pictures are really smooth, with a good tonality.<br>

<br />-Brighter and larger viewfinder, which gives an edges when composing.<br>

<br />-When using the minimum shutter speed=focal length rule to get sharp pictures, you don't have to make the X1.5 calculation ;)</p>

I'd like to contribute to this thread because I just had the same problem.

I bought a 2nd hand mamiya 7 with 80mm f4. I noticed the frameline seemed a bit wide but I had nothing to compare with.

I then found this thread and did the suggested check by removing the 80mm lens and putting it on while looking through the finder : No change in frameline size.

So I brought the camera back to the shop for a checked. After testing with different body/lens, it appeared that the problem was the lens.

The is a metal thread around the base of the lens (it does not circle completely around the lens). At one end of this thread should be a little "pin" of metal, which, when engaged, chooses the 80mm frameline.

On the lens I had bought, this pin was broken. So neatly broken that it was actually difficult to see.