Cokin Infrared

I've got two lenses. One zoom has a 67mm filter size. The other is a
50mm prime lens, on order, for a Nikon D70s, and I'm guessing the
filter ring is going to be either 52 or 55.

I want to do some infrared photography, but was having some problems
finding a filter holder for a Wratten filter, so I figured Cokin would
have something.

I would like to just get one size of filter, say the P system size,
and be able to use those filters on the smaller lens also. So, I'm
wondering how to take the P system and mount it on the smaller lens.

Or does anyone know where I can get some gel filter holders for lenses
these sizes?

The screw-in filters are just WAY expensive, so I don't want to go
that route.

Dwight
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