Re: Ilford SFX 120 & personnal info

[Cameron Shaw <cameron@xxxxxxxxxxxxx>]

George L Smyth wrote:
> 
> Jean-Francois Neron wrote:
> >
> > I just bought some Ilford SFX 120 film and would like to know for what ISO
> > I should set my camera. I'll use a Tiffen 25 Red filter.
> >
> > Also is using a #29 red filter making a big difference? I've never used any
> > infra-red film before.
> 
> Actually, SFX is an extended-red film, not an infrared film.  There shouldn't be
> much difference between a #25 and #29 filter.  I don't remember the EI at which
> I shot the film when I tried it (I wasn't too impressed with it), but thinking
> back I believe that if you knock 1/3 to 2/3 stops from the suggested speed you
> should get proper negatives.
> 
> Cheers -
> 
> george
> 
I agree with George that you do need to reduce speed rating by around
1/2 stop.
Unfortunately you will probably be dissappointed with the results from
Red 25 filter,
The nearest you can get to an infrared image and SFX200 film is by using
a Hoya R72 filter.
However it is too dark to use manual focus but some cameras I've tried
will auto focus through the R72 filter.
All the best
Cameron
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