Archived posting to the Leica Users Group, 1998/03/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]If your image size within the frame (on the film) is exactly the same size (you are closer to the subject with the 50 than the 90) and you shoot the 50 at f/1, the 90 at f/2, you will have greater DOF with the 90 because it is at f/2 and the 50 is two stops wider. If you photograph from the same distance with both lenses (50 image smaller on the film than the 90 image), you'll have to find some DOF tables to answer the question. Jim At 11:04 PM 3/5/98 +0800, you wrote: >Hello Luggers, > >I'd just like to know which has a more narrow or shorter dof: > >50/1.0 at f1.0 or a 90/2.0 at f2.0, distances we are talking about is >roughly 5 feet, 10 feet and 15 feet. > >Another question: If I'm missing a lot of portrait shots with my 90/2.0 at >f2.0, does this mean I will be missing (out of focus) at lot with a 50/1.0 >at f1.0? > >Would greatly appreciate some comments on this. > >Regards > >Ferdinand >