Archived posting to the Leica Users Group, 1999/07/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]If I remember correctly, DOF, to first order, depends on the absolute aperture. The noctilux has an aperture of ca. 51mm, whilst the 75/1.4's is about 54 mm. I'd expect the noctilux to have greater DOF wide open. As always, I'm open to correction. Regards, Akhil > Mark Rabiner writes: > > > I'm wondering what the difference would be a say 4 feet away DOF wise > > both lenses wide open? > > My hunch is the Noct would give you about 1 inch front to back and the > > 75 would give you 2. > > At 4 feet the 50mm f1 gives you 1.44 inches, the 75mm f1.4 gives you 0.72 > inches. > > So you were close, but the wrong way round. > > David Morton > dmorton@journalist.co.uk