Please, does anybody know which is the principle of a light trap on lens board ? Is it to prevent light leak through the hole or through the edges of the lens board ? Thanks
Please, does anybody know which is the principle of a light trap on lens board ? Is it to prevent light leak through the hole or through the edges of the lens board ? Thanks
Yes. Some boards have a light trap around the edges (Sinar, Cambo), and some have a round light trap that fits in a hole on the front standard (Linhof).
...or rather the front lensboard frame.
I have a Tachihara with a round hole in the front standard. I made my lensboard from 2mm plywood purchased at a hobby store.
There are no light leaks....certainly it is most improbable that light would leak through the opening in the lensboard for the lens: The opening is completely sealed by the retaining nut/ring holding the lens in place.
As a practical matter, moreover, there isn't light leakage around the recesses/slots which accept the lensboard in the front standard. Just choose a material whose thickness results in a tight fit in the recesses/slots.
There are other posts on this matter; the last I saw were at the photo.net large format archive; check for yourself.
Peter Collins
On the intent of the First Amendment: The press was to serve the governed, not the governors --Opinion, Hugo Black, Judge, Supreme Court, 1971 re the "Pentagon Papers."
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