[rollei_list] Re: Filter identification question

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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