Re: Filters and Konica 120 IR

[George L Smyth <GLSmyth@xxxxxxx>]

Peter De Smidt wrote:
> 
> I've been using Konica's 120 IR in a Rollei TLR with a Rollei Infrarot
> filter.  My film speed with this combination is 6.  I've recently
> acquired a series 5 G (orange) filter.  I've heard that with Konica IR
> effects with a orange filter are very close to those obtained with an
> infrared filter, but one gets a significantly faster film speed.  My
> question is, does anyone have a good guesstimate as to what my new film
> speed would be?  I'll certainly do some bracketing, but I'd like to have
> some idea of what I should bracket around.

Peter -

It depends upon how you meter.  I shoot Konica IR at EI 8 when metered through a
#25 filter.  You are correct in that an orange filter will give you a bit more
speed (and appear the same as the images shot through a red filter) due to the
speed of the filter.  I don't use an orange filter, but I would think that if
you were metering through the filter that you could keep your settings the
same.  If not, then add a stop or so for the filter facter.

george

-- 

Handmade Photographic Images
http://www2.ari.net/glsmyth/
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