Description
A low-power B&L 3.5X, rear element cleaned back to clear on the bench. Everything I did to it is written down below.
Bench report
- Functional
- Both elements clear after cleaning. Standard RMS thread, undamaged. Blue magnification band intact.
- Cosmetic
- Normal handling wear to the chrome barrel for its age. Engraving 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). · Rear element cleaned with lens solution and re-inspected after cleaning, not before. The film lifted completely.
- 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.
Specifications
- Maker
- Bausch & Lomb, Rochester N.Y.
- Magnification
- 3.5X
- Colour band
- Blue
- Thread
- RMS (Royal Microscopical Society) standard
- Full engraving
- 3.5X / BAUSCH & LOMB ROCHESTER N.Y.
- Optics
- Clear. Rear element cleaned on the bench, front element clean as found
- Storage
- Screw-top canister included