They\'re trying to say that on a 645 body (with the larger \'sensor\'), the 120mm/4 will give the same field of view as using a ~93mm lens on a 35mm body. Gives photogs, almost all of whom have used a 35mm body and lenses, a frame of reference when lens shopping.
Remember lens FL stays fixed - only thing that changes is FoV and DoF as sensor/film size moves up or down (in size) from 24x36mm.
1. On FF SLR 120/4 = 120mm FoV
2. As sensor/film gets < 35mm, FoV gets narrower (perception of longer lens), DoF at any given aperture gets deeper
3. As sensor/film gets > 35mm, FoV gets wider (perception of shorter lens), DoF at any given aperture gets skinnier
May 20, 2010 at 05:41 AM
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