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www.microscopyu.com/tutorials/workingdistance

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.

www.microscopyu.com/.../working-distance-and-parfocal-length

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.

www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=9922

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

www.olympus-ims.com/en/microscope/terms/working_distance

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 (W.D.)

www.newport.com/f/long-working-distance-objectives

These Long Working Distance Objectives are ideal to use when the application requires there be room between the objective and the target for other equipment like pipettes or syringes. These objectives have some of the world's longest working distances.

www.celestron.com/blogs/knowledgebase/what-is-the-working...

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 ...

www.microscopeworld.com/c-517-long-working-distance.aspx

Objective Lenses High Power Stereo Auxiliary Metallurgical Strain Free Polarizing Phase Contrast Objectives Long Working Distance Near-Infrared Radiation (NIR) Near-Ultraviolet Radiation (NUV) Ultraviolet Radiation (UV)

www.spectraldevices.com/.../long-working-distance-objectives

Our line of high-quality plan apochromatic objective lenses are designed with long working distances. Unlike standard microscope objectives, long working distance objectives enable microscopic inspection of objects from a significantly larger distance. These long working distance objective lenses are chromatic aberration corrected for red, blue, and yellow (apo) resulting in

www.the-digital-picture.com/Photography-Tips/How-to...

How to Calculate Lens Working Distance. By lens working distance, I am referring to the distance from the end of the lens (or the end of the lens hood if in place) to the subject. This is the amount of space you have to work in.

www.edmundoptics.com/resources/application-notes/...

Lastly, there is a dimension typically listed for objectives to allow the user to consistently know what length it is: the parfocal distance (PD). The parfocal distance is the distance from the flange of the objective to the object under inspection. For DIN objectives this distance is a standard 45mm and for JIS is it 36mm (Figures 8 and 9).