[OM] Re: E-300 weird behaviour with Tamron 90/2.5 Type II

[Wayne Harridge]

Interesting reading regarding "digital" lenses:

http://frog.netperson.net/~wiz/digital_lens_faq.htm

...Wayne


> 
> More playing with the E-300 + Tamron 90/2.5.
> 
> When the Tamron is stopped down to f22 and I take a shot of a 
> blank wall I get something like this:
> 
> http://lrh.structuregraphs.com/images/e-300-tamron-1.jpg
> 
> Notice the bright spot roughly in the middle of the frame !
> 
> This behaviour starts to become noticeable at around f11.
> 
> The problem doesn't occur with the 14-45mm or the Zuiko 85/2 !
> 
> I have heard of flare problems (Nikon context from memory) 
> with light bouncing off the sensor to the rear element of a 
> lens and back again.  Could the geometry of the Tamron be 
> just right to show this effect ?
> 
> ...Wayne
> 
> 
> 
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