Archived posting to the Leica Users Group, 1997/06/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Nevertheless your resolution at f16 is certain to be worse than at f8 in a well-corrected lens like the Elmarit.... On Tue, 24 Jun 1997, Richard Clompus <rclompus@voicenet.com> wrote: >aglang@sprynet.com asked about using f 22 on the 28mm Elmarit lens for >prefocusing with the hyperfocal distance: > >>but wouldnt it be better to use a wider f stop? Diffraction! > >I agree that diffraction becomes more of an issue with aberrations for some >lenses beyond f 16. I guess Leica in their optical wisdom felt the 28mm >Elmarit's optical design could hold up to f 22 without a major loss of >resolution or contrast. > >Another interesting observation I have made with the 28mm Elmarit is that >the diaphram blades do not open all the way even though the lens is set for >f 2.8. Its almost as if Leica could have perhaps made this lens an f 2.0 >but felt the aberrations wide open wouldn't meet their strict criteria for >sharpness or contrast levels. > >I am very pleased with the 28mm Elmarit. For those of you who waer >glasses, the external finder is very handy. I use it like a point and >shoot camera. Very fast, very discreet. > >Happy shooting, > >Richard >-------------------------- >Richard Clompus, OD >West Chester, Pennsylvania, USA >