Lens for macro?

Can anyone please advise on the quality & suitability for use on a Pentax Bellows M of an old lens I've been given?
It's marked "Ross Resolux, 5cm.(sic) f3.5 Enlarging Objective."
It's screw-mount, about 39mm.


Thanks,

Roger.

It's an enlarging lens from a reputable manufacturer of its day. Enlarging lenses work well on bellows because they are computed for close work and have a very flat field. However, there are better enlarging lenses, such as the later Rokkor or EL-Nikkor.

Thanks for the info., John.

R.