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Re: [OM] Bot Good Zuikos

Subject: Re: [OM] Bot Good Zuikos
From: "C. Hertzler" <hertzler@xxxxxxxxxx>
Date: Mon, 17 Aug 1998 10:55:50 +0200

george wrote:
>> Known NOT GOOD: 50/1.2, 50/1.4

>George, I'm curious if you remember if the 50/1.4 was MC or SC? I 
>have this lens in MC and have found it to be sharp even wide open. 
 
I have a 50/1.4 SC. In astro photography it is indeed not a good 
performer. Lots of coma in the corners. That means, the stars are 
looking like butterflies or at least elliptical. Same effect with 
fireworks, if you use the lens at 1.4 -  if you need that, to get 
some ambient light. At 2.0 its already much better.
The 50/1.4 MC might have the same problem, because the above is not a 
flare problem, but a result of the optical construction.
The 50/1.8 is a better performer wide open for taking pictures of 
point sources like stars. When I was a physics student (15 years ago) 
I did some side by side astro tests with the 1.4 and 1.8 f=50 mm 
lenses, which gave this result.
Other lenses which worked well in such applications: 300/4.5 and 
90/2.0

Christoph Hertzler 

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