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

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Subject: [Leica] BIG new Leica
From: red735i at (Frank Filippone)
Date: Fri, 23 Oct 2015 14:44:07 -0700
References: <> <0c1a01d10ddb$6eac4e80$4c04eb80$>

The 21 and 24 SEM are similar to the 50 ASPH Lux (and the WATE!).  I can 
pick out images from those lenses from others in my stable....

It may be that the optical characteristics of the most modern lenses are 
similar.... design tools?  Intentional design compromises?  Purely chance?

Frank Filippone
Red735i at

-----Original Message-----
From: LUG [ at] On 
Behalf Of John McMaster
Sent: Friday, October 23, 2015 2:40 PM
To: 'Leica Users Group'
Subject: Re: [Leica] BIG new Leica

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.



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Replies: Reply from mark at (Mark Rabiner) ([Leica] BIG new Leica)
In reply to: Message from roark.paul at (Paul Roark) ([Leica] BIG new Leica)
Message from john at (John McMaster) ([Leica] BIG new Leica)