parfocal

(pɑːˈfəʊkəl)

adj

(General Physics) optics (of a lens) maintaining focus even if magnification is changed

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The slit lamp has parfocal zoom optics that deliver a 200 f m diameter beam to the human retina.

Selective Retina Therapy with Real-Time Feedback-Controlled Dosimetry for Treating Acute Idiopathic Central Serous Chorioretinopathy in Korean Patients

Like other high-end cine lenses, the MK18-55 operates as a parfocal lens.

Focused on the cine look

Meade also claims the MWA series are parfocal, meaning that they reach focus at the same point.

Space-walking with the Meade MWAs: these new 100[degrees] eyepieces offer users vast fields and good ergonomics

The Vinden CZ 640 has a 35 -105 mm continuous-zoom parfocal lens with a 3x optical zoom, 4x digital zoom, and horizontal field of view (HFOV) from 17.1 degrees to 1.5 degrees.

Sierra-Olympic Introduces LWIR Chassis Camera with Continuous Zoom & Digital Signal Processing

Such an action provides evidence that the student knows the microscope is parfocal. I can usually fill in Blanks 7 and 8 at the same time.

A rubric for assessing a student's ability to use the light microscope

The optical system's range of achromatic and planachromatic objectives are parfocal and parcentered.

Microscopes; economical but high quality

The different objectives are designed to be parfocal, and therefore require only fine adjustment of focus when rotated.