SLR lens mount

Pentax 645 mount

Everything about the Pentax 645: flange focal distance, native lenses, cameras and which adapters keep infinity focus.

70.87 mm
Flange focal distance
1984
Introduced
SLR
System type
0
Lenses in our database

Mount facts#

Mount
Pentax 645
Maker
Pentax
Type
SLR
Flange focal distance
70.87 mm
Formats
6×4.5 cm & 44×33
Electronic contacts / AF
Yes
Production
1984–

About the Pentax 645#

Medium-format mount of the 645N and 645D/645Z.

Pentax 645 cameras#

Adapting basics#

A lens can be adapted with simple tube spacers when its flange distance is longer than the camera's. With 70.87 mm, Pentax 645 lenses can in principle go on bodies with shorter flanges such as Zenza Bronica ETR, Contax 645, Mamiya 645, Novoflex [de] A-mount, Ricoh 126C-Flex, Hasselblad H. Bodies with this mount can take lenses from longer-flange systems such as Rollei 6×6 (SL66/SLX), Pentacon Six, Hasselblad V, Kowa Six/Super 66, Kiev 88 / Salyut, Hasselblad 1000F & 1600F, Pentax 6×7, Zenza Bronica SQ.

Sources & licences#

Last updated October 03, 2026 · How we calculate · Sources