----- Original Message ----- From: "graywolf" Subject: Re: M85mm f2.0 bokeh
> Yes it is. Look at it this way, if you set a 50mm at f/2.0 it has a 25mm > opening, now if you set a 100mm at f/2.0 it has a 50mm opening, but at > f/4.0 it has the same 25mm opening that the 50mm does at f/2.0. So, if > the magnification of your viewing image (print) is the same (which Bill > took care of by slightly enlarging his 70mm image) then the DOF will be > the same. (Note that you can control the magnification by changing > distance also, but that will change the perspective of the image.) > And remember, it's not the aperture # but the aperture diameter.......... Thanks for reminding me of that one. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
