filter als telephoto farbfehlerkorrekurmittel
For colour snaps , polarizers help to saturate reflective surfaces even if very wide angles provide uneven results (noticeable if large blue sky areas are included)
I note that some of the older very long lenses are often criticized for colour aberrations, while they also have openings for "einschubfilter" avoiding the cost of large radius high quality filters or dubious foils.
I presume that the Noflexars on the pigriffC mount, possibly the long Leitz two-element achromats on the televit mounts as well as some Kilfitt constructions with such drawers will perform even better for B&W if any colour filter is used. Curvature of field will reamain unchanged, so focussing a bit out from center and stopping down a little may be needed
The effect should be managed with as light colouring as possible blocking the least desirable wavelengths.
p.
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