Year/Period |
1910-1920 |
Maker |
ZEISS |
Country |
Germany |
Signature |
Carl Zeiss / Jena [in logo] / 7423 // F / 1.8 mm n.A. 0.9 / D 0.17 |
Category |
Accessories microscopy |
Subcategory |
Optical components |
Optical 2 |
Achromatic |
Size of the box (h x w x d) |
sleeve: h 5.2 × ø 2.6 cm |
Size of the instrument (h x w x d) |
h 3.7 × ø 1.5 cm |
Donated by |
J.W. van Eijk, Zoetermeer, the Netherlands |
Inventory number |
SM 378 |
In a brass sleeve with screw cap. The sleeve is signed with the Zeiss logo, and an ‘F’.
The ‘F’ lens was manufactured in two versions, one without a correction collar (this one) and one with a correction collar (see SM 36).
The lens contains a fluorspar (calcium fluoride) lens, which makes it possible to correct the chromatic aberration of the lens better than in a normal achromatic lens. The result is that the lens is very sensitive to variations in the thickness of the cover glass. If it is not exactly the indicated 0.17 mm, the spherical aberration increases.
Astro eyepieces
BLEEKER
1950-1960
Drawing prism
ZEISS
1900-1930
Lenses and prisms
BLEEKER
ca. 1950
Microscope lamp
AMERICAN OPTICAL COMPANY
ca. 1970