The Zeiss LD Plan-Neofluar 40×/0.60 KORR Long Working Distance Objective (M27) is a specialized long working distance dry objective combining a 1.5–3.3mm working distance range with a correction collar (KORR) for substrate thickness compensation — designed for fluorescence, phase contrast, and brightfield imaging of living cells in multi-well plates, Petri dishes, T-flasks, and other thick-substrate vessels on Zeiss Axio series microscopes. Offered here in lightly used condition with flawless optics at significant savings versus the list price. 📏 Long working distance: 1.5–3.3mm — the working distance range varies with the correction collar setting, providing 1.5–3.3mm of clearance for imaging through plastic vessel bottoms of varying thickness without contact with the specimen surface 🔧 Correction collar (KORR) — adjustable substrate thickness compensation enabling optimal spherical aberration correction through plastic vessel bottoms of varying thickness, from thin glass coverslips through standard 1.0–1.5mm plastic vessel bottoms 🌟 Plan-Neofluar fluorite optical design — fluorite glass elements providing excellent chromatic correction and high fluorescence transmission for multi-channel fluorescence and brightfield imaging 🔬 NA 0.60 at 40× — practical numerical aperture for long working distance imaging, delivering good resolution and contrast for live-cell biology, cell migration, and proliferation studies 📐 M27 thread mount — current Zeiss standard, compatible with Zeiss Axio series microscopes including Axiovert, Axio Observer, Axio Imager, and Axio Examiner 🇩🇪 Zeiss quality, made in Germany — precision optical construction for consistent, high-efficiency light transmission and long service life ✅ Condition: Lightly used — flawless optics — catalog number 421360 🔧 Product Description The Zeiss LD Plan-Neofluar 40×/0.60 KORR M27 is a long working distance objective engineered for cell biology workflows where specimens are imaged through thick plastic substrates — multi-well plates, Petri dishes, T-flasks, and imaging chambers — that standard short-working-distance objectives cannot accommodate. The working distance range of 1.5–3.3mm reflects the correction collar’s function: as the collar is adjusted to compensate for different substrate thicknesses, the effective working distance changes accordingly, providing optimal spherical aberration correction through plastic vessel bottoms ranging from thin glass coverslips through standard 1.0–1.5mm plastic vessel bottoms. This combination of long working distance and correction collar makes the LD Plan-Neofluar 40× KORR uniquely versatile for live-cell imaging in standard tissue culture conditions without the need to transfer cells to specialized coverslip-bottom dishes. The Plan-Neofluar fluorite design provides excellent chromatic correction and fluorescence transmission for multi-channel imaging. The M27 thread mount is the current Zeiss standard, compatible with Zeiss Axiovert, Axio Observer, Axio Imager, and Axio Examiner microscopes. This unit is offered in lightly used condition with flawless optics at a significant discount to the list price of $4,800. Catalog number 421360. 🔎 Typical Applications Live-cell fluorescence imaging through multi-well plates, Petri dishes, and T-flasks at 40× Cell migration, proliferation, and morphology studies in standard tissue culture vessels Brightfield and DIC imaging of cells in standard culture conditions Long-term time-lapse fluorescence imaging of living cells without coverslip-bottom dishes Imaging through thick plastic substrates requiring correction collar compensation Any application where standard 40× working distance is insufficient for the vessel or substrate 📊 Key Specifications Specification Details Catalog Number 421360 Magnification 40× Numerical Aperture (NA) 0.60 Immersion Medium Dry (air) Working Distance 1.5–3.3mm (varies with correction collar setting) Correction Collar Yes (KORR) — for substrate thickness compensation Optical Design LD Plan-Neofluar KORR (Long WD, fluorite, correction collar) Correction Infinity-corrected Thread / Mount M27 (current Zeiss standard) Compatible Microscopes Zeiss Axiovert, Axio Observer, Axio Imager, Axio Examiner Country of Origin Germany Condition Lightly used — flawless optics SKU 421360 University and institutional purchase orders are welcome. Please contact us for invoicing and procurement documentation.
