Zeiss PCV Negative Barlow lens Ø41mm FL -46.51mm Dpt. -21.5 MC

Description

Zeiss PCV Negative Barlow lens Ø41/37.5mm FL -46.51 MultiCoated
These authentic and original optical parts come directly from a surplus (close-down business in Germany).
Great for DIY and research projects.
Purpose:
Carl Zeiss manufacturing process (several sources involved, including Schneider).
Diameter Ø:
41
mm (max. diameter) / 37.5mm (min. diameter)
Thickness:
9.5mm
Focal Length:
-46.51mm
Diopters:
-21.50
Coating:
multicoated
Optical standard:
unknown (most probably
BK-7 substrat).
Brand:
Zeiss
Class B+:
it suffers very small nicks, only seen if you look for them (see pics).
Sent in anti-acid organic (paper) bag for long term storage causing no harm to optics.