Up for sale is a very fine condition of a Japan made Seiwa APO 10x 0.23 M Plan (Correct Tokyo). It comes with a plastic tube case. It works properly. It’s clean in and out. It’s similar like a Mitutoyo product. Please see the last picture taken from this lens. Made in Japan.

The Seiwa M.PlanAPO10X 0.23 is a precision-crafted apochromatic objective lens designed for high-resolution imaging in visible light applications. Here’s a breakdown of its key specifications and features:

🔬 Technical Highlights

Feature Specification

Magnification 10x

Numerical Aperture (NA) 0.23

Working Distance 38.9 mm

Focal Length 20 mm

Resolution 1.5 µm

Depth of Field 5.2 µm

Image Circle 24 mm

Compatible Tube Lens f = 200 mm

Mounting Options M26 or RMS thread

Weight ~215 g

Wavelength Range 450–680 nm (visible spectrum)

This information is from ChatGPT.