Re: Ghost spots

[Gary Beasley <beasleyglb@xxxxxxxxxxxxxx>]

>> It's best explained by realizing the ghost spots are caused by reflections
>> of infrared light, not visible light. The #25 filters have a high level of
>> visible light in relation to the IR so in effect washes the ghost spots
>> away. You may still find them in areas of very strong ghost spots that show
>> with an 87 if you know where to look and the image is reflecting little
>> visible light but lots of IR, (like a black synthetic cloth or wig).
>> Gary Beasley
>>
>
>
>Gary,
>Looks a bit logical to me, although I quite cannot see, that IR light
>reflecs more than visible light as both will go through the filmlayer
>and bounce against the pressureplate. Your theory is that the visible
>light passing through a #25 filter will wash away the IR ghost images.
>Yes, that sounds OK. Could we have some more opinions from the IR
>experts on this LIST? Thanks for your response Gary!
> *
>> - 
>Best regards,
>Jaap Los
>Alkmaar, The Netherlands
>
Remember the pressure plate is blackened to visible light so any effect by
the plate reflections is IR only. The mix of the two reduces the effect
greatly. If you have an IR only image with a detail like the spot and a
visible light image without it and overlay the two the result is a less
obvious spot in many cases, depending on the visible lights' ratio to IR.
Hope this clarifies my thoughts for you.
Gary Beasley
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