N°91371 · Family detail
HeliosPortrait·PENTAX K mount
Helios-77K-4 50mm F/1.8
Specifications01
MountPENTAX K
Focal length50mm
Max aperturef/1.8
TypePortrait · Prime
Weight250 g
Filter size52 mm
Min focus distance0.45 m
Aperture blades6
Optical elements6
Groups4
AutofocusNo
StabilizationNo
Aperture controlAperture ring (Manual settings only)
EraFilm era
Production statusDiscontinued
Additional Info02
Lens TypeStandard prime lens
Field Notes02
50mm prime lens for the Pentax K mount with a maximum aperture of f/1.8. Intended for general photography and low-light use, with manual-focus operation.
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Other Mounts03
No alternate mounts are indexed for this family yet.