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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