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Working Distance and Parfocal Length Microscope objectives are generally designed with a short free working distance, which is defined as the distance from the front lens element of the objective to the closest surface of the coverslip when the specimen is in sharp focus.


Working distance can range from 50 mm for dissecting or stereo microscope objectives to less than 0.1 mm for high-power oil immersion objectives. It decreases as magnification, resolution and numerical aperture increase. Microscope objectives are usually designed with short working distances. The stage working distance is the vertical distance ...


Learn about microscope Working Distance (W.D.) The distance between the front edge of the objective lens and the specimen surface (with the surface of the cover glass in case of the cover glass objective lens ) when the specimen is focused.


Working distance is a term used in microscopy to describe the distance between the specimen and the lens. Microscopes usually have a short working distance. Microscopes use a parfocal lens that stays in focus when the magnification or focal length changes.


Long working distance (LWD) microscope objective lenses from Microscope World.


The working distance in the SEM is the distance at which the beam is focussed, normally the distance from the final pole piece of the lens to the sample when the image is in focus.


distance vision See distance vision. working distance (WD) 1. The distance at which a person reads or does close work. 2. In retinoscopy, the distance between the plane of the sighthole and that of the patient's spectacles. 3. In microscopy, the distance between an object and the front surface of the objective.


Compound microscopes use a series of mirrors and lenses to magnify specimens placed between a light source and the objective lens. Magnification and working distance are two different characteristics of a microscope that are directly related.


Thorlabs offers Mitutoyo Plan Apochromat Objectives with 5X, 10X, 20X, or 100X magnification. These plan apochromat objectives feature chromatic correction at three wavelengths and spherical correction at two wavelengths to provide a flat field of view. The long working distance provides a wide spac


The Long Working Distance Microscope Objectives are designed around 426 o 656 nm to provide a chromatic aberration-free image with a flat field correction. The objectives have a parfocal distance of 95 mm which means that the objectives are interchangeable within the turret of the microscope system with the same working distance to the specimen.