I would sometimes get something like that from reflections off the uv filter.
Could that be a reflection off the sensor and rear element? Does changing the 
aperture change the size of the spot?

On April 9, 2015 6:56:21 AM PDT, Jens Bladt <[email protected]> wrote:
>Hi guys
>I sometimes get a blueish spot, when I use a macro lens.
>Please look at:
>
>https://www.flickr.com/photos/bladt/16900869850/in/photostream/
>
>Any suggestions and help is very much appreciated :-)
>
>Thanks
>Jens

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