Brand: Nachet
Maker: Nachet, Paris
Type: Oil Immersion Objective
Model: 1/12
Magnification: 100x
Numerical Aperture (NA): 1.30
Material: Brass, Optical Glass
Country/Region of Manufacture: France
Vintage: Yes
Time Period Manufactured: Circa 1880–1885
Original/Reproduction: Original
Thread Type: Pre-RMS
Offered is an original 1/12 oil immersion objective by
Nachet, Paris, manufactured in the early 1880s.
This is a high-performance late 19th-century French oil immersion objective featuring a numerical aperture of 1.30, representing advanced optical development of its period.
Model: 1/12
Oil immersion objective
Magnification: 100x
NA: 1.30
Height: 36.9 mm
Pre-RMS thread configuration
Unlike earlier fixed correction systems, this example features a rotating correction collar (see image 4).
The collar includes small raised grips for easier adjustment — a refinement over earlier smooth designs.
Produced during a period when French optical engineering was rapidly advancing, this objective predates full standardization of RMS threading while already exhibiting high numerical aperture performance.
Good antique condition consistent with age.
Normal surface patina and wear present.
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