Archived posting to the Leica Users Group, 2013/11/19

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Subject: [Leica] Zeiss Otus - Lens sharpness confusion
From: alal at poly.edu (Akhil Lal)
Date: Tue, 19 Nov 2013 14:25:15 -0500 (EST)
References: <8D0B36B7097FCFC-F1C-36B0E@webmail-d170.sysops.aol.com> <Pine.GSO.4.62.1311191423160.18449@duke.poly.edu>

Sorry, that should read: "Completely...."

On Tue, 19 Nov 2013, Akhil Lal wrote:

> complete different test protocol. Cannot be compared.
>
> On Tue, 19 Nov 2013 lrzeitlin at aol.com wrote:
>
>>> From LensTip.com
>> "The Zeiss Otus 1.4/55 compares very favourably with its rivals because 
>> at 
>> the maximum relative aperture it reaches 38 lpmm. On stopping down the 
>> situation only improves and by f/4.0 the MTFs are on a record-breaking 
>> level of 50 lpmm. The chart below makes it easier to see that the Otus is 
>> really far better than all its competitors. "
>> 
>> In October, 1978 the magazine "Modern Photography" in a comprehensive 
>> test 
>> of normal lenses achieved a resolution of 102 lpmm with a Leica DR 
>> Summicron 50 mm lens using Micro-Ektachrome film. Other lenses were close 
>> behind. Those made by Nikon, Canon, Minolta, Pentax and Olympus all 
>> reached 
>> 100 lpmm. For those who care to look it up, the article was titled "How 
>> Sharp Can you Get?" The experiment was critically evaluated and appeared 
>> sound. Images of the results are presented.
>> 
>> That was 35 years ago. What am I missing here?
>> 
>> Larry Z
>> 
>> 
>> 
>> _______________________________________________
>> Leica Users Group.
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>> 
>


In reply to: Message from lrzeitlin at aol.com (lrzeitlin at aol.com) ([Leica] Zeiss Otus - Lens sharpness confusion)
Message from alal at poly.edu (Akhil Lal) ([Leica] Zeiss Otus - Lens sharpness confusion)