The Tiedemann optics consist of a four lens eyepiece: Two eyelenses (A) and two field lenses (B). Eyelenses (both) dia=2.0cm, f=5.0cm; Field lenses dia=3.1cm, f(combined)=5.0cm. The only objective lens is stamped "4", and has a single biconvex lens (dia=7mm, f=5mm, aperture=2mm.
Assembled eyepiece. The eyeshade is now missing.
Assembled objective No. 4. The aperture diameter is 2mm.
The illuminating mirror is mounted in the slot between the two support pillars. The mirror is parabolic with only one reflecting surface; diameter = 4.0cm