parfocal
adjective
par·fo·cal
ˌpär-ˈfō-kəl 
: being or having lenses or lens sets (such as eyepieces) with the corresponding focal points all in the same plane
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“Parfocal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/parfocal. Accessed 1 Dec. 2024.
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parfocal
adjective
par·fo·cal
(ˈ)pär-ˈfō-kəl
: having corresponding focal points all in the same plane : having sets of objectives or eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope) with which they are used
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