Colin G.
Established
I do for sure.
Some might be interested to read this 'interview' with Zeiss lens designer Christian Beder in Camera Lens News No. 36 [July 2010 -Zeiss website] :
http://www.zeiss.com/c12567a8003b58b9/Contents-Frame/785c9ff1f55c808ac125774c00590b19
The article inevitably covers some of the ground in this thread's discussion.
.............. Chris
Not to discount those that have had problems, but I now have three ZM lenses and so far haven't had a single problem. My 50mm Plannar I've had for 3 years, and it is one of my favorite lenses....Funny thing that in this article they make a point that each lens passes through more than 50 quality control stages - and yet - they (ZM lenses) still have light leaks, wobble, etc. Hmmmm.
We know one thing, it's got to be at least half the mass of the new ZF 35MM F1.4
Before the Leica 35mm ASPH there was a 35mm ASPHERICAL which was discontinued because it used aspheric surfaces that were made in an older, more expensive way. The price is now very high because of its rarity, but I wonder if it had less focus shift than the 35mm ASPH (either version 1 or the new current one)? Maybe it's so valuable that no one uses one.
Focus shift on the aspherical is about the same as on the v1 ASPH - fairly noticeable at close range, particularly from f2-4. I used one extensively until a collector offered me enough for it to spend a few months overseas.
Marty
Do you miss a ZM 35mm f1.4?
Is it just me or the Biogon looks still sharper even after the Summilux was adjusted ?