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Astro eyepieces

Year/Period

1950-1960

Maker

BLEEKER

Country

The Netherlands

Signature

SM 256.1: HASTRO / f=9mm / NOI [in logo]
SM 256.2: HASTRO / f=9mm / NOI [in logo]
SM 256.3: HASTRO / f=12.5mm / NOI [in logo]
SM 256.4: HASTRO / f=18mm / NOI [in logo]
SM 256.5: HASTRO / f=25mm / NOI [in logo]
SM 256.6: KASTRO / f=7mm/ NOI [in logo]

Category

Accessories microscopy

Subcategory

Optical components

Optical 1

Compound

Size of the instrument (h x w x d)

Length 4.2 × diameter 2.8 cm

Donated by

P.P. de Bruijn, Zeist, the Netherlands

Inventory number

SM 256

Description

Six eyepieces for use in the astronomy, one Kastro and five Hastro.

Optical data:

Eyepiece f = 7 mm f = 9 mm f = 12.5 mm f = 18 mm f = 25 mm
Diameter lens 1 (mm) 4 3.5 4.5 5 6
Diameter lens 2 (mm) 6 8 10 17 26
Distance between lenses (cm) 1.0 1.3 1.3 2.5 2.8
Diameter eyepiece (cm) 2.8
Length eyepiece (cm) 4.2