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1X STEREO LENS FITS L3313 RHOMBOID ARM
Bausch & Lomb CAT. NO.53-70-30. Made to fit the
B&L 53-70-28 Stereo Rhomboid Arm. Inside is an
elliptical front surface aluminized mirror, major axis is
34mm and minor access is 24mm. 5.5mm thick. Mirror
material is optical glass, Index of 1.517 and Abbe V#
64.5. Openings are 25mm. Top has bayonet type mount.
3 screws hold the diagonal onto the assembly, so it can
easily be removed for other applications. Of course, if you have one of the
B&L Model 240 Aerial Photo Interpretation Zoom Stereoscopes, then you
definitely need these.
L3314 $10.00
2X STEREO LENS FITS L3313 RHOMBOID ARM
Bausch & Lomb CAT. NO.53-70-31. Made to fit the B&L
53-70-28 Stereo Rhomboid Arm. Inside is a coated
cemented doublet lens with a focal length of 52.4mm,
and an elliptical front surface aluminized mirror, major
axis is 34mm and minor access is 24mm. 5.5mm thick.
Mirror material is optical glass, Index of 1.517 and
Abbe V# 64.5. Top has bayonet type mount with a
25mm opening. Of course, if you have one of the B&L Model 240 Aerial
Photo Interpretation Zoom Stereoscopes, then you definitely need these.
L3315 $12.00
0.43X STEREO LENS FITS L3313 RHOMBOID ARM
Bausch & Lomb CAT. NO.53-70-29.
Made to fit the B&L 53-70-28 Stereo
Rhomboid Arm. Inside is a coated
cemented doublet lens with a focal length
of 620.4mm, a coated double concave
lens with a focal length of -55mm, and an elliptical front
surface aluminized mirror, major axis is 34mm and minor
access is 24mm. 4.5mm thick. Mirror material is optical
glass, Index of 1.517 and Abbe V# 64.5. Top has
bayonet type mount with a 25mm opening. Of course,
if you have one of the B&L Model 240 Aerial Photo
Interpretation Zoom Stereoscopes, then you definitely
need these.
L3316 $15.00
Lenses - Page 69
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