Filters and Konica 120 IR

[Peter De Smidt <pdesmidt@xxxxxxxxxxxxx>]

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.

Regards,
Peter De Smidt
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