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[OM] Re: (OM) E-1 with Zuiko 100/2

Subject: [OM] Re: (OM) E-1 with Zuiko 100/2
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sun, 17 Feb 2008 07:32:32 -0500
Interesting.  I've never seen such obvious spots before.  Maybe I should 
do some testing.

Chuck Norcutt

Wayne Harridge wrote:
>>> I'm probably shooting myself in the foot by writing this; but
>>> regarding the
>>> recent discussion about Tokina AT-X lenses, I have a Tok 
>> AT-X 24-40  
>>> f/2.8,
>>> the only lens I have ever bought from KEH.
>>>
>>> It IS very sharp, but ... it has the weird and annoying
>>> characteristic of
>>> unexpectedly and unpredictably dumping a large round patch of blue  
>>> (sky) in
>>> the middle of an image. So I haven't used it as much as I 
>> expected I  
>>> would.
>>>
> 
> 
> This sounds a bit like the problem I have had with the Tamron 90/2.5 on
> digital.
> 
> If you get a chance try shooting a plain wall at various apertures and focal
> lengths to see what happens with the round patch.  It could be related to
> light reflecting off the sensor.  With my 90/2.5 it is seemed to become
> apparent at about f11.  Check the following link for some examples:
> 
> http://lrh.structuregraphs.com/test/tamron_90_re_reflect.htm
> 
> ...Wayne
> 
> 
> 
> 
> 
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