[LargeFormat] Confused Uncle Seeks Truth

Sun May 4 03:30:03 2003

I obtained a fragmentary sample of the glass from the inventor and it did enhance reds without any apparent adverse effects when held to the eye but a large filter plus several adapter rings added up to quite a lot so I didn't buy.PL
> 
> Wrom: JPHSCRTNHGSWZIDREXCAXZOWC
> Date: 2003/05/04 Sun AM 02:27:31 GMT
> To: largeformat@f32.net,  <largeformat@f32.net>
> Subject: Re: [LargeFormat] Confused Uncle Seeks Truth
> 
> Unk,
> 
> Enhancing filters. Tiffen, B+W, HiTech, etc. I have and use B+W and Tiffen. 
> I also have some from the inventor of the "didymium" filter, Howard G. 
> Ross. See:
> 
> http://medfmt.8k.com/mf/filters.html
> 
> These filters have roughly a 1/2 stop correction factor. My Tiffens & B+Ws 
> are 1.4, my didymiums are 1.8 .
> 
> Under the right circumstances, these filters can give an outstanding 
> effect. And you cannot look through them to determine what the film will 
> see. Experience is the only way. Each manufacturer has a different quality. 
> my B+W's are different from my Tiffen's, both of which are w-a-y different 
> from my didymium's.
> 
> Jim
> 
> 
> 
> 
> At 09:29 AM 5/4/2003 +0800, rstein wrote:
> >Dear Friends,
> >
> >      Uncle Dick has been reading about soemthing called a Redhancer filter.
> >Apparently this will boost up the red tones in a colour picture while
> >leaving the other colours unaffected. A special glass, I believe.
> >
> >      I am intrigued. I need guidance before I spend my own money. ( If I am
> >spending someone else's money I can do it freehand - this is a principle
> >very popular with the government....)
> >
> >     1.    Does it really work?
> >
> >     2.     Does it work in red only or does it extend to orange and yellow?
> >
> >     3.     How much of a boost is there?
> >
> >     4.     Is it an effect that is dependant upon the angle of the sun or
> >rotation of the filter like a polarising filter?
> >
> >     5.    Does it affect red tones in a negative and a transparency film
> >equally?
> >
> >     6.     Can your eye see these changes in the red tones when you look
> >through the filter at the scene that you want to photograph?
> >
> >     7.    Is there an exposure increase needed?
> >
> >     8.     Is there a similar filter that works on other colours? ie blue or
> >green.
> >
> >      I hope someone in the landscape line has had some experience with one
> >of these and can report. Many thanks for the help.
> >
> >      Uncle Dick
> >
> >
> >
> >
> >
> >
> >
> >
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> 
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