Lens question please_Gundlach, Turner-Reich series II No. 1

Hello LF public

I recently bought a very old GTR triple convertable (5x5 glass), have been reading
about them in public forums by search in Google and learnt that they have bad
"chromatic aberation" (as it were), so it is necassary to use a yellow, orange or red
filter on the front or back for sharpness. I read one fellow uses green.

I would like to know which glass does what with which color of the spectrum so as
to klnow which color filter to use! This would be interesting. I would use the filter
on the front because I could also screw a lens shade into the filter. I wonder if I
could find such an adapter for the front, if the front cell were not in use.

But, this lens is a series II No. 1 patented in 1895, yet the rims do not state either
of the focal lengths, and they are in an old wollensak Regno shutter (working!),
which must have been a later adaptation, it has a proper triple aperture scale in
brass (fancy work!).

Would anyone know the focal lengths, and whether a cable or air hose can be
adapted? It does have push button type finger release(s).

Any help much appreciated,

--
Giant_Alex })))*
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