Archived posting to the Leica Users Group, 2015/10/23

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Subject: [Leica] BIG new Leica
From: john at (John McMaster)
Date: Fri, 23 Oct 2015 23:40:27 +0200
References: <>

The 21mm SEM beats the Elmarit asph in all areas IMO. I would say that the S 
range is Leica's still lens showcase range ;-)


-----Original Message-----

?Yes, everything is a whole set of compromises.  I assume Leica and Zeiss 
will both continue to make optics that also cater to those who value 
compactness.  The M line is Leica's current showcase of what it can do.  It 
may be that the Loxia line for the Sony is representative of what Zeiss can 
do for that platform.

Since wide angle optics are the main area of my concern regarding the Sony 
line, I was curious just how much of a penalty that platform will pay.  To 
show this, I made a Tiff file with a cutout of the Leica v. Zeiss Loxia 21mm 
f/2.8 entries into this competition shown on different layers.  The images 
are adjusted to equalize size and distance from the sensor/film.
Some might find looking at the two similar optics interesting.  Download the 
Tiff from

As to relative sharpness, all we have are MTF curves that are not 
necessarily comparable.  If they are to be believed, the Zeiss wins by a 
hair.  My experience is that Leica is more conservative in these, and in
the real world Leica might well win by a hair.   The main and more
objective measure of performance that could be important is that, consistent 
with the performances we see in other wide angle lenses, the more retrofocus 
optic has less vignetting. Zeiss is claiming light falloff at f/2.8 that is 
equal to the Leica at f/8.



Replies: Reply from red735i at (Frank Filippone) ([Leica] BIG new Leica)
In reply to: Message from roark.paul at (Paul Roark) ([Leica] BIG new Leica)