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Knowledge Center/ Technical Frequently Asked Questions/ Microscopy Frequently Asked Questions/ Infinity-Corrected Objectives/ What is the significance of the field number of an objective and what is it dependent on?

What is the significance of the field number of an objective and what is it dependent on?

The field number is the maximum field number of the eyepiece that they should be used with.  For infinity corrected objectives the maximum field number is dependent on the tube lens clear aperture and how far apart the tube lens is from the objective.

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