Data sheet: Mamiya E 70–150 mm f/3.8 (Z/E mount)

Pekka Buttler, 06/2025

Specifications

The table below summarizes the lens’ key specifications (measurements based on pictured sample):

Brand:	Mamiya-Sekor	Lens name	Zoom E 80~200mm 1:3.8
Focal length(s)1	70–150 mm	Angle-of-view2	34,3°–16,4°
Maximum Aperture	f/3.8	In Production	1981-1984
Lens mount	Mamiya Z/E	Subfamily (if applicable)	––
Length3	119,3 mm	Diameter4	65,0 mm
Filter ring diameter	52 mm	Weight	503 grams
Lens element count	12	Lens group count	9
Aperture blades (S/R/C)5	6 S	Focus throw	220 °
Minimum focusing distance	102 cm @70mm 99 cm @150mm	Maximum magnification	1:10,4 @70mm 1:4,9 @150mm
Has manual aperture ring	NO	Has Manual focus ring	YES
Aperture mechanism type	electronic/mechanic 6	Aperture click stops 7	3.8•5.6•8•11•16•22•32

Further notes:

• In 1980 Mamiya introduced the Z line of cameras and altogether 16 lenses.
• 10 of those lenses were regular primes in the range of 28 to 300 mm, one short macro lens and altogether 5 zooms.
• Of those zooms, one can be characterised as a wide-angle zoom (28–50 mm), two can be described as standard zooms (35–70 and 35–105), and two more were typical tele zooms (70–150 and 80–200).
• Judging by their element counts, two of those zooms were constructed using a more elaborate/ambitious design. One of these was the 35–105/3.5–4.3 (15 elements in 13 groups) and the other was the 80–200/3.8 (14 elements in 10 groups).

• This lens is a relatively compact, comparatively bright tele zoom.
• The lens is a one-ring zoom, meaning that you adjust focal length by pushing or pulling on a ring and that you rotate to adjust focus.
• To zoom in (towards a narrower field of view), you pull the ring backward. The lens’ zooming action is internal, meaning that the lens does not change shape when zooming.
• When rotating the focusing ring from infinity towards minimum focusing distance, the lens becomes a 11,6 millimetres longer.
• The filter threads rotate when focusing.
• The lens is not parfocal – neither at infinity nor MFD.
• It has a decent focus throw and a not entirely unattractive minimum focal length.

• As a quirk that was typical for the Mamiya Z system, the lens does have an aperture ring, but that ring has no function on the lens itself (Mamiya Z lenses aperture rings communicated the chosen aperture to the camera, which in turn did the closing down). This has implications on adaptability (read more below).

History of Mamiya Z/E lenses

Please see the JAPB article on all (7) Mamiya SLR lens mounts to understand the role of the Mamiya Z/E mount.

Adapting

n.B! The following applies to all Mamiya Z/E mount lenses.

This lens cannot be used natively on any current SLR or dSLRs. To use it in its native environment, you will need a Mamiya Z/E-mount film body – a ZE, ZE-2, ZE-X or ZM. While the Mamiya Z/E system remained in production for only 4 years (and was not a mega-hit), these bodies are relatively easy to find.

While the lens sports electronic contacts, these are not needed to facilitate critical functionality. However, as the aperture ring of Mamiya Z/E lenses is a dummy ring (it does not manipulate the lens’ aperture in any way – it instead communicates the aperture to the camera body, which in turn manipulates the lens’ aperture lever), adjusting aperture is a function that has to be taken care of by the adapter.

Therefore, should you aim to adapt this lens to a mirrorless camera you will need an adapter that facilitates adjusting the lens’ aperture. Luckily, every Mamiya Z/E adapter I’ve seen does offer such a functionality. However, due toMamiya Z/E lenses not being among the most numerously manufactured, special adapters (helicoid adapters, tilt/shift adapter and speed boosters) are currently unavailable.

Using Mamiya Z/E lenses on dSLRs is also possible. However, due to that the, difference in flange focal distances between the Mamiya Z/E lens and the dSLR mount (between +1,5 mm and negative 1 mm) invariably does not allow sufficient space for an adapter that allows aperture modification, these adapters are always adapters with added optics to achieve infinity focus.

Footnotes

1. Focal length is (unless stated otherwise) given in absolute terms, and not in Full-frame equivalent. For an understanding of whether the lens is wide/tele, see ‘Angle-of-view’. ↩︎
2. Picture angle is given in degrees (based on manufacturers’ specs) and concerns the diagonal picture angle. Rule of thumb:
   > 90 ° ==> Ultra-wide-angle
   70–90 ° ==> Wide-angle
   50–70 ° ==> Moderate wide-angle
   40–50 ° ==> ‘Standard’ or ‘normal’ lens
   20–40 ° ==> Short tele lens
   10-20 ° ==> Tele lens
   5-10 ° ==> Long tele lens
   < 5 ° ==> Ultra-tele lens ↩︎
3. Length is given from the mount flange to the front of lens at infinity. ↩︎
4. Diameter excludes protrusions such as rabbit ears or stop-down levers. ↩︎
5. S=straight; R=rounded; C=(almost)circular at all apertures. ↩︎
6. The lens communicates the selected aperture electronically, but the lens is closed down mechanically. ↩︎
7. Numbers equal aperture values on aperture ring; • intermediate click; – no intermediate click. ↩︎