TAKO. INTERNET SEIT 1996.
Olympus-OM

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

Subject: [OM] Re: E-300 weird behaviour with Tamron 90/2.5 Type II
From: Winsor Crosby <wincros@xxxxxxxxxxx>
Date: Wed, 22 Mar 2006 09:11:21 -0800
It looks very like the Nikon phenomenon. With Nikon it only seems to  
happen with the predigital 50mm lenses, at small apertures. Digital  
sensors are a lot more reflective than film apparently. It does not  
seem to happen with more modern lenses where all the surfaces are  
multicoated. The shape of the rear element probably affects it too. I  
wonder that sensor filters are not multicoated as well.



Winsor
Long Beach, California, USA




On Mar 21, 2006, at 2:41 AM, Wayne Harridge wrote:

>
> 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 ?


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