Description
A high-dry AO Spencer 43X in the less-common 0.55 aperture. Optics clear as found. This one needed no cleaning.
Bench report
- Functional
- Optics clear front and rear, inspected as found. Standard RMS thread, undamaged. Plain achromat. There is no Plan marking on this barrel and I am not going to imply one.
- Cosmetic
- Normal handling wear to the chrome and gold band. 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).
- 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
- American Optical / AO Spencer
- Magnification
- 43X
- Numerical aperture
- N.A. .55
- Optical tier
- Achromat (no Plan marking present)
- Colour band
- Gold
- Thread
- RMS (Royal Microscopical Society) standard
- Full engraving
- AO SPENCER / 43X / N.A. .55
- Optics
- Clear as found. No cleaning required
- Storage
- Screw-top canister included