[rollei_list] Re: Filter identification question

Many thanks Carlos!

Regards, Jerry



--- Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx> wrote:

> I think John is right, it must be a R1 color
> conversion filter because only the Rolleiflex color
> conversion filters have double bayonet (male and
> female). The R1 filters are recommended to eliminate
> blue excess using five element lenses and it also was
> recommended to use with four elements lenses -Xenar
> and Tessar- for color photography in general due to
> this filter has an additional UV effect regarding the
> four elements lenses (The UV effect is not perceptible
> for five elements lenses according F&H technical
> brochures).
> The Rolleiflex Infrared filter is included within
> filters for B&W photography, one of the reasons to use
> this filter with Infra Red films is to compensate the
> different focusing distance due to the infrared rays.
> 
> All the best
> Carlos 
> 
>      
>  --- John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>
> escribió:
> 
> > Jerry,
> > 
> > If it was an Infra Red filter it would be almost
> > black (very dark red)so
> > as to only pass infra red light. The inscription
> > would have been
> > "Infrarot" . I suspect it is a Rollei warm-up
> > (colour conversion for
> > colour film) filter "R1" also available in strengths
> > R1.5, R2, R5, R11.
> > These had a female bayonet fitting on the front so
> > that an additional
> > filter could be attached as required. Similar
> > filters in Blue were
> > available and as a cased set.
> > 
> > John
> > 
> > -----Original Message-----
> > From: rollei_list-bounce@xxxxxxxxxxxxx
> > [mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf
> > Of Jerry Friedman
> > Sent: 22 June 2006 13:31
> > To: rollei_list@xxxxxxxxxxxxx
> > Subject: [rollei_list] Re: Filter identification
> > question
> > 
> >  
> > Hi!
> > 
> > I hope someone can help me identify a Rollei Bay III
> > filter that I have
> > with the letters I R on it. It is clear and has bay
> > III fittings on both
> > sides (male on onme end, female on the other). 
> > Should I assume this is
> > an infra-red filter?  How is it used and what effect
> > would it have being
> > used with black and white film?
> > 
> > Many thanks, Jerry F.  
> > 
> > 
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> > 
> 
> 
> 
>       
>       
>               
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