Thank you for mentioning that, I never even considered it. Quite an odd
problem.
___________________________________
John Hermanson
Camtech Photo Services, Inc.
21 South Lane, Huntington NY 11743
631-424-2121 | Olympus OM Service since 1977
http://www.zuiko.com | omtech1 AT verizon.net
Moose wrote:
> John Hermanson wrote:
>
>>I think this floating dot anomaly was brought up here a year or so ago,
>>or I saw it on another list. A direct reflection off the low pass filter
>>to the rear element and back.
>>
>
> It was indeed. However, I have also seen images posted with ghost lights
> caused by filters on the front of a lens. The reflection off the sensor
> assembly going through all the non-flat elements and reflecting back off
> the flat filter to the sensor. Not likely with all lenses, or perhaps
> even with the same zoom lens it may be dependent on focal length, but it
> does happen.
>
> That's the reason behind the new 'digital' filters, with more extensive
> coatings. It's also behind the digital version of many lenses, like the
> Tamron Di and Di II lenses - optical design changes to eliminate any
> possible reflections and more extensive internal coatings.
>
> Moose
>
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