Archived posting to the Leica Users Group, 2013/10/09

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Subject: [Leica] Can someone say what this sentence means?
From: hopsternew at (Geoff Hopkinson)
Date: Thu, 10 Oct 2013 03:46:10 +1000
References: <> <> <>

I used Google translate set to "BS gobbli-gook dumb ass meaningless" to

I get something like:
Correction compromises in the optical design may be apparent in some
conditions where Out of Focus light sources are included in the
frame.......hmm, worse huh?

How about you can see stuff like coma (or distortion) sometimes.

All lens do it to some extent, even very expensive M lenses wide open for
example...except that even more expensive new APO Summicron 50 ASPH. Stop
it down to f/4 or so and it is ridiculously perfect. To be really
unsettled, also take a look at the MTF numbers from the X Vario sometime!

Here is the toughest situation possible for point light sources and you can
see that the Summilux M 35 ASPH is not immune at f/1.4 . Look at the point
specular light sources which were frozen at 1/4000th. Text book coma at
extreme edges


On 10 October 2013 01:27, George Lottermoser <george.imagist at>wrote:

> On Oct 8, 2013, at 10:37 PM, Jayanand Govindaraj wrote:
> >> ?When taking pictures with many image-dominant, open light sources, it
> is common for correction defects to show up.?
> >>
> >> Okay, what the hell does this actually MEAN? I have no idea what an
> image-dominant open light source is.
> a wild guess at what this may mean
> <
> >
> Regards,
> George Lottermoser
> george at
> _______________________________________________
> Leica Users Group.
> See for more information

In reply to: Message from abridge at (Adam Bridge) ([Leica] Can someone say what this sentence means?)
Message from jayanand at (Jayanand Govindaraj) ([Leica] Can someone say what this sentence means?)
Message from george.imagist at (George Lottermoser) ([Leica] Can someone say what this sentence means?)