N°416772 · Family detail
PentaxMacro·PENTAX K mount·1975
Pentax SMC 100mm F/4 Bellows
Specifications01
MountPENTAX K
Focal length100mm
Max aperturef/4
TypeMacro · Telephoto · Prime
Release year1975
Weight185 g
Filter size52 mm
Physical length40 mm
Aperture blades6
Optical elements5
Groups3
Min aperturef/32
AutofocusNo
StabilizationNo
Aperture controlAperture ring
Lens hoodNot required
TeleconvertersPentax Rear Converter-A 1.4X-S→ 140mm F/5.6
Pentax Rear Converter-A 2X-S→ 200mm F/8
EraFilm era
Production statusDiscontinued
Additional Info02
ModelSMC
FormatFull-Frame
SeriesK Series Bellows
Squeezenone
Lens TypeMacro lens
Iris Blades6
Release Date1975
Data Protocolnone
Focus Zoom Rodnone
Front Diameter Mm60
Summary02
Pentax K-mount 100mm bellows macro lens with maximum aperture f/4, intended for close-up photography using a bellows focusing system.
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.