Archived posting to the Leica Users Group, 1997/06/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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