N°107394 · Family detail
PentaxZoom·PENTAX K mount·1978
Smc Pentax-M 28-50mm F/3.5-4.5
Specifications01
MountPENTAX K
Focal length28-50mm
Max aperturef/3.5
TypeZoom
Release year1978
Weight310 g
Filter size52 mm
Min focus distance0.6 m
Aperture blades6
Optical elements10
Groups10
Min aperturef/4.5
AutofocusNo
StabilizationNo
Aperture controlAperture ring (Manual settings only)
Lens hoodPH-R52 - Clamp-on round
EraFilm era
Production statusDiscontinued
Additional Info02
Lens TypeStandard zoom lens
Summary02
Pentax K-mount zoom lens with a 28–50mm focal range and maximum apertures of f/3.5–4.5. A standard/general-purpose lens for everyday photography and light-to-moderate low-light use.
AI-assisted summary — verify against linked sourcesWhere can this lens be adapted?
The Pentax K mount has a flange distance of 45.46 mm. A plain adapter fits a camera whose flange distance is at least 1.46 mm shorter. How lens adapters work
- Pentax DA and FA J lenses have no aperture ring. Use an adapter with its own aperture control.
- Pentax DA lenses are made for APS-C.
- Sony EAdapter · 27.46 mm
- Canon RFAdapter · 25.46 mm
- Nikon ZAdapter · 29.46 mm
- Fujifilm XAdapter · 27.76 mm
- L-MountAdapter · 25.46 mm
- Micro Four ThirdsAdapter · 26.21 mm
- Fujifilm G (GFX)Adapter · 18.76 mm
- Canon EF-MAdapter · 27.46 mm
- Canon EFAdapter · 1.46 mm
A rear element that sticks out can hit the camera mirror.
No plain adapter reaches infinity focus on: Nikon F.
Other Mounts03
No alternate mounts are indexed for this family yet.