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Old May 4, 2009, 1:49 AM   #11
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this is not a digital only phenomenon, it aslo happens in film photopgraphy
with reflections off the shiny surface of the film.

These sort of reflecton go on all through the lens system and while this extreme example is noticeable they all tend to reduce sharpness and contrast.

As you say the coating of lens surfaces is one of the main answers to the problem.

The quality of these coatings is one of the subtle benifits of more expensive lenses, and of course Pentax have been one of the leaders in field with their Super Multi Coating (SMC).

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Old May 4, 2009, 2:37 AM   #12
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This is almost certainly filter flare.

The characteristics of filter flare tends to be an exact inverted image of the bright points in the shot(in this case, the candles), rotated about the center of the image.

If the flare is caused by ONE reflection off a lens element surface, then the flare will usually not be exactly the same size as the bright spot. The exact same size indicates that the reflection is cause by a flat surface not a curved one, as in a lens element surface. So in this case, the filter is the flat surface.
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