Olympus D Plan 50X Oil Immersion Objective with Iris for BHT, BHTU, BHS, CHS & CHT Microscopes (1-LB555) 🔬 50X oil immersion with iris diaphragm — high-magnification versatility with adjustable NA 📐 NA 0.90 / WD 0.23mm — exceptional resolving power for fine structural detail 🔩 RMS thread / 160mm tube length — fits Olympus BHT, BHTU, BHS, CHS, CHT and compatible 160mm systems 🌟 D Plan (Achromat) optics — reliable correction for routine high-magnification brightfield work ✅ Condition: Excellent — flawless optics 🔧 Product Description The Olympus D Plan 50X Oil Immersion objective (part number 1-LB555) is a high-magnification achromat with a built-in iris diaphragm, designed for the Olympus BHT, BHTU, BHS, CHS, and CHT microscope series. At 50X with a maximum NA of 0.90, it delivers the resolving power needed to clearly distinguish fine subcellular structures, microorganisms, and material surface features at a magnification level that sits between the common 40X dry and 60X/100X oil objectives. The integrated iris diaphragm is a particularly useful feature — it allows you to continuously adjust the effective numerical aperture without changing objectives. Stopping down the iris reduces NA, which increases depth of field and improves contrast on low-contrast specimens, while opening it fully maximizes resolution. This makes the 50X iris objective especially practical for metallurgy, materials inspection, and any application where specimen contrast varies significantly. Oil immersion at this magnification eliminates the refractive index mismatch between the objective front element and the coverslip, ensuring maximum light collection and sharpest possible images. Standard RMS threading and 160mm tube length make this a direct drop-in for any BHT/BHS/CH-era Olympus nosepiece. This unit is in excellent condition with flawless optics. 🔎 Typical Applications Hematology and blood smear examination Bacteriology and microbial morphology Metallurgical and materials surface inspection High-magnification histology and cytology Replacement or upgrade 50X objective for BHT, BHS, CHS, or CHT systems 📊 Key Specifications Specification Details Part Number 1-LB555 Manufacturer Olympus Series D Plan (Achromat) Magnification 50X Immersion Medium Oil Iris Diaphragm Yes — adjustable NA Numerical Aperture (NA) 0.90 (max) Working Distance (WD) 0.23mm Thread RMS (Royal Microscopical Society) Tube Length 160mm Compatible Microscopes Olympus BHT, BHTU, BHS, CHS, CHT and other 160mm RMS systems Country of Origin Japan Condition Excellent / Flawless Optics 📋 University and institutional purchase orders accepted. Contact us with any questions — we're happy to help you find the right objective for your Olympus system.
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