N°96535 · Family detail
PentaxZoom·PENTAX K mount·1984
Pentax-A SMC 28-135mm F/4
Specifications01
MountPENTAX K
Focal length28-135mm
Max aperturef/4
TypeZoom
Release year1984
Weight820 g
Filter size77 mm
Physical length112 mm
Min focus distance1.7 m
Max magnification0.3333
Aperture blades6
Optical elements17
Groups15
Min aperturef/22
AutofocusNo
StabilizationNo
Aperture controlAperture ring (Manual settings + Auto Exposure setting)
Lens hoodRH-A80 - Clamp-on round
TeleconvertersPentax Rear Converter-A 1.4X-S→ 39-189mm F/5.6
Pentax Rear Converter-A 2X-S→ 56-270mm F/8
EraFilm era
Production statusDiscontinued
Additional Info02
ModelSMC
FormatFull-Frame
SeriesA Series Zoom
Squeezenone
Lens TypeStandard zoom lens
Iris Blades6
Release Date1984
Data Protocolnone
Focus Zoom Rodnone
Front Diameter Mm80
Summary02
Pentax K-mount SMC Pentax-A 28–135mm zoom lens with a constant f/4 maximum aperture. Intended for general-purpose shooting across wide-to-telephoto focal lengths.
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.