Description
A Plan Achromat, not a plain achromat. Flat-field corrected, and the catalogue number is on the barrel. Optics clear, no cleaning needed.
Bench report
- Functional
- Optics clear front and rear, inspected as found. This one needed no cleaning at all. Standard RMS thread, undamaged.
- Cosmetic
- Normal age and handling wear to the chrome. Engraving legible under raking light. No colour band is visible on any face. 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
- Catalogue number
- Cat. 1076
- Optical tier
- PLAN ACHRO (flat-field achromat)
- Magnification
- 10X
- Numerical aperture
- N.A. .25
- Thread
- RMS (Royal Microscopical Society) standard
- Engraving, face 1
- 10 X / N.A. .25
- Engraving, face 2
- CAT. 1076 / PLAN ACHRO
- Optics
- Clear. Inspected, no haze / fungus / separation
- Storage
- Screw-top canister included