Re: filter value of red and yellow filters in 16/3.5?

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 11 Feb 00 at 14:59, Barry B. Bean wrote:

> Does anyone know offhand the filter values for the built in filters
> on the zuiko 16/3.5? In particular, how should I compensate  when
> shooting Infrared (i.e. EIR, and HIE) film?

Most Japanese red filters are R60, equal to Wratten #25.
For yellow I vaguely recall Y11, which most likely equals Wratten #8, 
IOW: too light for EIR, while the orange filter (O?) is most likely a 
tad too strong.

Such lenses are good arguments to use BTFR-filters (between the film 
rails)....one of my motives was a Sigma 8mm/f4.0 (internal screw-in 
filters, requiring the lens to be dismounted in two separate parts).

And for opaque filters, this application makes even more sense....no 
blocked viewfinder, and continuously mounting & dismounting filters 
for each new shot (one of the reasons why I also like my Horizon 
202....view/rangefinder cameras are equally comfortable).

Email me privately if you want more details about these BTFR-filters.


--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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