Objective lenses. All are multi-element lenses, several with correction collars. The range in magnification
from 1 1/2 to 1/8 inch.
from 1 1/2 to 1/8 inch.
The low magnification objective (1 1/2") can also have this Lieberkuhn reflector.
All but the lowest magnification objectives have tube length correction collars labeled 10–40. Very few manufacturers other than P&L supplied correction collars.