This is description of this part:
Microscope objective manufactured for Kosmos Stuttgart by Will Wetzlar.
Specification:
Manufacturer: Kosmos Stuttgart (Will Wetzlar)
Model: 170/- 20/0.40
Magnification: 20x
Correction: Achromat
Numerical Aperture: 0.40
Tube Length: 170 mm
Focal Length: 37 mm
Cover Glass: No
Immersion: No
Thread: RMS
Interestingly, despite its 20x magnification, this microscope objective is marked as requiring no coverslip.
Objective lens of excellent optical quality.
Currently, Kosmos Stuttgart sells plastic educational microscopes for children imported from China.
High-quality optical microscopes were once sold under this brand (or Humboldt), primarily those manufactured at the Hertel & Reuss factory in Kassel.
What is this part needed for?
- If you have a Kosmos microscope without objectives and need to upgrade it using original parts
- If you have a Kosmos microscope that doesn't have an objective lens with this magnification and want to upgrade it
- If you have such an objective lens, but it's of very poor quality or damaged
- If you're cautious and want to have such an objective lens on hand
- If you're looking for a very good 20x objective lens for your microscope from another manufacturer
