Archived posting to the Leica Users Group, 2006/11/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Wai Leong I'm not shure about that. Yes, the DOF marks on the lenses are no longer correct when used with a M8 - but the other way round. I don't make any calculations - am not really interested in the mathematical aspects of photography - but a few months ago I did just a few empiric tests with the same 50mm/1.2 lens wide open on a M6 and a R-D1 (with it's crop factor of 1,5). It seems to be the opposite - on the R-D1 shots there was visibly more DOF. Same lens/smaller format = MORE DOF. It is my general experience that the bigger the formats get, the narrower the DOF is with the same focal length/aperture. On 6x6 negatives with 100/f2.8, I have a DOF about as narrow as with 50/f1.4 on small format. But as said, these are no academic calculations, just estimations out of my modest experiences. Didier >Since d is smaller for a digital sensor that is less than 24x36 mm, it is >clear that a 35 mm lens used with a digital sensor must have a smaller DOF >at all distances.