https://www.microscopyu.com/microscopy-basics/working-distance-and-parfocal-length

In general, the objective working distance decreases as the magnification and ... apertures and the necessary degree of correction for optical aberrations.

https://www.edmundoptics.com/resources/application-notes/imaging/understanding-focal-length-and-field-of-view/

Learn how to understand focal length and field of view for imaging lenses through calculations, working distance, and examples at Edmund Optics.

https://www.quora.com/Is-focal-length-the-same-as-working-distance

The working distance is the distance between the front of the lens and the object you are photographing. In general photography, this is usually ...

https://www.vision-doctor.com/en/optical-basics.html

The most important parameters for the calculation are the image field, sensor size , working distance and focal length of the optics. The first two values, however, ...

https://physics.stackexchange.com/questions/438073/focal-length-vs-working-distance-in-an-infinity-corrected-objective

You are correct that for a single lens the working distance would be the focal length. For compound lenses, like microscope objectives, you ...

https://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) ...

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9889/98891L/Optical-system-design-with-variable-working-distance-for-monitoring-of/10.1117/12.2227729.full

Apr 27, 2016 ... However, there is an area of diagnostic tasks where the compact and portable optical systems working on distances within the range of 0.5 m to ...

https://www.vision-systems.com/cameras-accessories/article/16735776/understanding-fundamentals-of-imaging-lenses

Some lenses, such as objective lenses, have a fixed working distance; many ... see “Choosing the correct optics,”Vision Systems Design, February 2004, p. 7.

https://www.opto-e.com/products/TCLWD-long-working-distance-bi-telecentric-lenses

Telecentric lenses for 2/3″ detectors featuring long working distance, excellent resolution and the lowest optical distortion.

https://www.shanghai-optics.com/assembly/microscope-objectives/ultra-long-wd-18mm-100x-objective/

The current market is limited to working distance 12mm for 100X microscope objectives. Our clients require a cost effective and compact solution for 18 mm ultra ...