I think that blue dot is the reflection of light off the sensor being
reflected back by the rear element of the lens. I don't think any light
placement can eliminate it. The sensor surface is a lot shinier than
film is. Some great lenses cannot be used because of it.
On 11/3/2016 1:59 PM, Collin B wrote:
At work I got the FA50/2.8 macro to have something AF for working in the
darker warehouse area.
But what I've seen, and it's not just a Pentax situation, when using it with
the florescent lights for piece shots I get this blue dot in the middle of
the image. Have yet to work with light placement to see if I can eliminate
it. But from what I've been reading it has to do with multiple factors, one
of which is the nature of the film coatings and the light
interactions/reflections with the sensor surface.
I only see the situation under the fl product lights.
Anyone else here have similar issues when product shooting? If so, how did
you resolve the situation?
--
I don't want to achieve immortality through my work; I want to achieve
immortality through not dying.
-- Woody Allen
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