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

Thorlabs offers long working distance M Plan objectives for ultraviolet (UV), visible, ... These objectives are designed for use with a tube lens focal length of 200 mm and are ideal for machine ... Super Apochromatic Microscope Objectives

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

Microscope Objective Lens, Long Working Distance, 2x, 0.05 NA, 100 mm FL. $991. In Stock ... Design Tube Lens Focal Length, 200 mm, 200 mm. Thread Type ...

https://www.microscopyu.com/microscopy-basics/infinity-optical-systems

Older finite, or fixed tube length, microscopes have a specified distance from the ... approach a significant percentage with the longer focal length optical system.

https://www.edmundoptics.com/knowledge-center/application-notes/microscopy/understanding-microscopes-and-objectives/

With a simple magnifier, the object is placed within the focal length of the single ... With a microscope, a relay lens system replaces the single lens; an objective ... for a broad spectral range and generally have a long working distance given the  ...

http://blog.microscopeworld.com/2009/06/microscope-focal-length.html

Jun 4, 2009 ... A common microscopy term you may hear is focal length. The term focal length refers to the amount of distance required between the objective ...

https://sciencing.com/focal-length-microscope-objectives-8596901.html

Microscope objectives have short focal lengths to greatly enlarge the images. Ocular Lens. The focal length of an objective is the distance from the lens to the point ...

https://www.olympus-lifescience.com/en/microscope-resource/primer/anatomy/tubelength/

The mechanical tube length of an optical microscope is defined as the distance from ... Some reflected light objectives are designed to focus at a longer working  ...

https://courses.lumenlearning.com/physics/chapter/26-4-microscopes/

Microscope Magnification. Calculate the magnification of an object placed 6.20 mm from a compound microscope that has a 6.00 mm focal length objective and a ...

http://www.brooklyn.cuny.edu/bc/ahp/CellBio/Focus/FL.Main.html

One type, called eyepieces, are used at the top of the microscope barrel. It is at this lens that observers place their eyes. Such eyepiece lenses have relatively long ...

https://olympus.magnet.fsu.edu/primer/anatomy/infinityintro.html

In a system with a 200-millimeter tube lens focal length, this would necessitate a longer parfocal distance in order to use an objective of this low magnification.