Автор: 6traka4a
Дата: 17-11-05 20:03
Това е една тема в Зенит групата, която се развива в момента. Може би има хора, които не са се регистрирали в тази група(![[smilie18]](https://photo-forum.net/forum/smileys/smiley18.gif) ) та
аз ще изнасям тук как стоят нещата, а вие може да помагате също с идеи. Поне на мен ми е любопитно...
Ето и за какво става дума:
Hi
I don't care about making my own lenses. I am ten thumbs, so it would
never work. But I have tried to make my own ND filter. I once saw a ND
filter (I think it was a Contax filter) made of a metal plate with
small holes in. I have made a test myself, using an old UV filter,
taking the glass out, replaced it with some thick, black paper, and
then made some holes in it. It reduce the light, but I never tested it
on real film. My guess is it will influence on DOF. My guess is I have
to be very careful where I make the holes, but it is only guessing. I
am sure Contax did it, so it must be possible.
It sounds like there are some people here with knowledge, so maybe
someone has some hints? I think a ND filter is quite usefull,
specially because Zenit cameras don't have so fast shutter speeds. It
may also be usefull for flash photography...
Thomas
Отговорът:
Hi Thomas,
ND filter can be made from a sheet of B&W film. Expose it and develop to
density you need :) I heard this hint from a comrade in another list but
I never used it myself.
--
Best regards,
Sergey A.Galin http://sageshome.net/
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