Description
An oil-immersion 100X that is actually clean. No dried immersion oil on the front element, which is the usual problem with these.
Bench report
- Functional
- Optics clear front and rear, inspected as found, with no dried oil or residue on the front lens. Standard RMS thread, undamaged. Coated optics per the engraving.
- Cosmetic
- Normal handling wear to the barrel. Black band intact. Serial 73649 legible. Ships in the screw-top canister shown.
- Tested
- Optics inspected under direct light and against a bright field. Front and rear elements examined at magnification. · No haze, no fungus, no balsam separation, and no chips visible in the glass. · RMS objective thread inspected for burrs, cross-threading, and dings. None found. · Every legible engraving read under raking light and transcribed exactly as marked (see Specifications).
- Not tested
- NOT mounted on a microscope. I do not have a matching stand for it, so resolution, field flatness, parfocality, and working distance at magnification are NOT verified. · No disassembly, recollimation, or internal service performed. · Sold as a used optical component, not as a calibrated or certified instrument. · Immersion oil is NOT included and NOT required for the sale. You will need your own.
Specifications
- Maker
- Unitron
- Magnification
- 100X (oil immersion)
- Numerical aperture
- n.A. 1.25
- Serial / number
- 73649
- Coating
- Coated (marked)
- Colour band
- Black
- Thread
- RMS (Royal Microscopical Society) standard
- Full engraving
- UNITRON / 73649 / Coated / Oil.100XR / n.A. 1.25
- Optics
- Clear and dry. No dried immersion oil
- Storage
- Screw-top canister included