N°109490 · Family detail
PentaxTelephoto·PENTAX 645 mount·1984
Pentax-A 645 SMC 300mm F/4 ED
Specifications01
MountPENTAX 645
Focal length300mm
Max aperturef/4
TypeTelephoto · Prime
Release year1984
Weight1360 g
Filter size77 mm
Physical length208 mm
Min focus distance3 m
Max magnification0.1099
Optical elements8
Groups8
Min aperturef/32
AutofocusNo
StabilizationNo
Aperture controlAperture ring (Manual settings + Auto Exposure setting)
Lens hoodBuilt-in telescopic round
TeleconvertersPentax Rear Converter-A 645 1.4X→ 420mm F/5.6
Pentax Rear Converter-A 645 2X→ 600mm F/8
EraFilm era
Production statusDiscontinued
Additional Info02
Model645 SMC
Format645 film
SeriesPentax-A
Squeezenone
Lens TypeMedium telephoto prime lens
Data Protocolnone
Focus Zoom Rodnone
Front Diameter Mm93
Summary02
Pentax 645 SMC A* 300mm f/4 ED [IF] is a fixed focal-length telephoto prime for Pentax 645 medium-format cameras, intended for subjects at distance with relatively bright aperture. The IF designation indicates internal focusing.
AI-assisted summary — verify against linked sourcesWhere can this lens be adapted?
The Pentax 645 mount has a flange distance of 70.87 mm. A plain adapter fits a camera whose flange distance is at least 1.46 mm shorter. How lens adapters work
- Pentax 645 DA lenses have no aperture ring. Use an adapter with its own aperture control.
- Sony EAdapter · 52.87 mm
- Canon RFAdapter · 50.87 mm
- Nikon ZAdapter · 54.87 mm
- Fujifilm XAdapter · 53.17 mm
- L-MountAdapter · 50.87 mm
- Micro Four ThirdsAdapter · 51.62 mm
- Fujifilm G (GFX)Adapter · 44.17 mm
- Canon EF-MAdapter · 52.87 mm
- Canon EFAdapter · 26.87 mm
A rear element that sticks out can hit the camera mirror.
- Nikon FAdapter · 24.37 mm
A rear element that sticks out can hit the camera mirror.
Other Mounts03
No alternate mounts are indexed for this family yet.