Archived posting to the Leica Users Group, 2007/01/15

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Subject: [Leica] 28mm Summicron vignetting
From: len-1 at comcast.net (Leonard Taupier)
Date: Mon Jan 15 19:30:02 2007
References: <C1D19B01.4282E%mark@rabinergroup.com> <DBC50B1B-B8B7-476A-A784-203F9B5623BF@comcast.net> <001c01c73918$5ad93090$6501a8c0@asus930>

The shots I posted have no cropping at all. Your slide mount itself  
crops a little. Also I don't know if b&w negatives make a difference.

Yup. That new 28mm asph Elmarit is a beauty. I saw it at my local  
shop. I think he only got one in and it was gone in two days. The  
lens is really tiny. And cheaper than a mint, used non-asph. Hard to  
believe.

Cheers,
Len

On Jan 15, 2007, at 9:45 PM, G Hopkinson wrote:

> Len thanks for posting some stuff so promptly. It's very enjoyable  
> to be discussing actual Leica photographs on the LUG! I agree
> that the effect seems more apparent in your examples, perhaps, than  
> mine. Mine too would have been at moderate apertures. I may have
> been misleading discussing the wide open performance. I think what  
> we are looking at is a sky polarisation effect rather than true
> vignetting. It may be exacerbated by conversion to the digital  
> versions that we are all looking at. I notice this with conversion to
> black and white particularly with significant tonal adjustments.
> Another factor may be where we have cropped with the different  
> shots. For my images, I crop to A4 proportions. That typically
> discards the extreme outside edges of the original 24 x36mm frame  
> (where some of the effect resides). Look carefully at the bottom
> corners of Img145 from your son's examples.
> <http://gallery.leica-users.org/v/LeonardT/28mm/Img145.jpg.html>
> I don't see any effect in the bottom corners. It's not apparent in  
> shots where the bottom corners are very dark, of course. That
> might square with my polarisation theory.
>
> When I look carefully, on a light box at my Velvia originals, the  
> effect is much less apparent, as well.
>
> Herr Puts describes the 2 28 asph as having marginally higher fall  
> off than the Elmarit and the new 2.8 28 asph sounds very
> interesting indeed, doesn't it?
> I think that the current 28 is an absolute triumph of design and a  
> lens that I really enjoy using.
>
> Cheers
> Hoppy
>
> -----Original Message-----
> From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org  
> [mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On  
> Behalf Of
> Leonard Taupier
> Sent: Tuesday, 16 January 2007 12:08
> To: Leica Users Group
> Subject: Re: [Leica] 28mm Summicron vignetting
>
> Mark,
>
> Not so sure. Leica's data shows a lot of vignetting at f5.6.
>
> Len
>
>
> On Jan 15, 2007, at 8:56 PM, Mark Rabiner wrote:
>
>> On 1/15/07 7:35 PM, "Leonard Taupier" <len-1@comcast.net> typed:
>>
>>> Here are a few examples of vignetting using the 28mm Summicron.  
>>> These
>>> were shot in b&w but the sky was crystal clear blue. These were shot
>>> by my son at Zion, Bryce and the Grand canyon.
>>>
>>> <http://gallery.leica-users.org/v/LeonardT/28mm/Img138.jpg.html>
>>>
>>> <http://gallery.leica-users.org/v/LeonardT/28mm/Img145.jpg.html>
>>>
>>> <http://gallery.leica-users.org/v/LeonardT/28mm/Img225.jpg.html>
>>>
>>> <http://gallery.leica-users.org/v/LeonardT/28mm/Img136.jpg.html>
>>>
>>> I'm not sure of the f stop but I believe they were in the f5.6 to f8
>>> range. We ran a test in my backyard of the Summicron versus the
>>> Elmarit (not asph). The Elmarit had a little less vignetting. All  
>>> the
>>> examples were easily fixed in Photoshop using the lens distortion
>>> filter.
>>>
>>> Len
>>>
>>>
>>>
>> I don't think you're going to get vignetting at f5.6 to f8 with
>> even the
>> cheapest dumbest glass.
>> I think this is sky polarization or digital stuff emphasized by
>> extreme
>> addition of contrast.
>>
>>
>> Mark Rabiner
>> New York, NY
>> 40?47'59.79"N
>> 73?57'32.37"W
>>
>> http://rabinergroup.com/
>>
>>
>>
>>
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>
>
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In reply to: Message from mark at rabinergroup.com (Mark Rabiner) ([Leica] 28mm Summicron vignetting)
Message from len-1 at comcast.net (Leonard Taupier) ([Leica] 28mm Summicron vignetting)
Message from hoppyman at bigpond.net.au (G Hopkinson) ([Leica] 28mm Summicron vignetting)