Re: Bluedot Frustration...

Possible reflection of the rear element on the sensor.
I had that problem with a 60mm Elmarit-R and the old Canon EF 35-350mm f/3.5-5.6 USM L. This is now being addressed by various manufacturers with the refiguring of ghost free coatings, or "Ghostless coating". 
s.d.


On Jan 25, 2008, at 5:26 PM, David Young wrote:
Today, I have been shooting a couple of "collectibles" that I own, even though I don't consider myself a collector.
Every now and again, I get a blue "flash" or bright spot, in the center of my photos. 

See: http://www.main.furnfeather.net/BluDot.htm
This has occurred, infrequently, with the Canon 20D, 30D and with the R8+DMR.
It seems to be lens independent, as well. I notice it most with the 80~200/4 Vario, but then, that's the lens I use the most. It has occurred indoors and out, with no correlation to the use of the lens hood. Sometimes, just shooting another frame (as I did, today, on the tripod) produces a shot without the Blue Dot Special. 

My questions are:

1) am I the only person in the world, to have this problem?

2) If no, does anybody here know what causes it?  And,

3) if "yes", how do I prevent if from happening again?

Thanks for any and all help!

Cheers!
---

David Young,
Logan Lake, CANADA

Wildlife Photographs: http://www.furnfeather.net
Personal Web-pages: http://www3.telus.net/~telyt
Stock Photography at: http://tinyurl.com/2amll4


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