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Adjective: parfocal
  1. With the lower focal points all in the same plane; - said of sets of eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope or telescope) with which they are used

Encyclopedia: Parfocal

Nearest

parentless
parer
paresis
paresthesia
paretic
Pareto
pareve
parfait
parfait glass
parfleche
parfocal
parget
pargeting
pargetry
pargetting
parheliacal
parhelic
parhelic circle
parhelic ring
parhelion
pari passu