I hadn't thought of that - With the lens removed the bright portion of the dot would be of the order of 1mm diameter.
I guess with the lens in place it could get rather dispersed, but should be small enough to be usable if the lens is near focus.
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Mike
Pentax K5ii & Panasonic G5 user (with far too many bits to list)
Member of North Essex Photographic Workshop
Also online with PentaxUser.co.uk, Flickr, MU-43, MFLenses...
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