Mamiya-Sekor 250mm F/4.5

Short telephoto prime lens • Film era • Discontinued

  • Announced:
  • · 1970
  • Production status:
  • ● Discontinued
  • Country of design:
  • · Japan
  • Original name:
  • · MAMIYA-SEKOR 1:4,5 f=250mm
  • Class:
  • · Slow 6x7 medium-format short telephoto prime lens
  • · Professional model (Top class)
  • System:
  • · Mamiya RB67 (1970)

Model history (2)

■Mamiya-Sekor 250mm F/4.5A5 - 41.85m⌀77 1970 ●
■Mamiya-Sekor C 250mm F/4.5A5 - 41.85m⌀77 ●

Specification

Optical design:
Medium format 6x7
250mm
F/4.5
5 elements in 4 groups
Mamiya RB67 [111mm]
20.4°
Diaphragm mechanism:
Diaphragm type:
Automatic
Aperture control:
Aperture ring (Manual settings only)
Built-in leaf shutter:
Type:
Mechanical Seiko #1
Range of shutter speeds:
1 - 1/400 + T
Self-timer (V):
-
Shutter speed control:
Shutter speed ring
Flash sync mode:
M & X sync
Flash sync terminal:
Yes
Focusing:
1.847m
1.57m
1:5.26
Focusing modes:
Manual focus only
Manual focus control:
None; focusing from the camera
Physical characteristics:
1310g
<No data>
Accessories:
Screw-type 77mm
Screw-type round
Not available

Sources of data

  • Manufacturer's technical data.
  • Mamiya RB67 Professional booklet.
  • Mamiya RB67 Professional instructions.
  • Mamiya RB67 Pro S price list by Bell & Howell (1975).
  • Mamiya RB67 Pro S booklet (1977).
  • Mamiya RB67 Pro-S booklet.
  • The Mamiya RB67 system for 6x7 slr photography booklet.

Mamiya-Sekor series

The first generation of lenses designed for Mamiya RB67 series medium format 6x7 SLR cameras. Introduced with the Mamiya RB67 Professional in 1970.

  • Mechanical Seiko #1 leaf shutter;
  • Fully synchronized for M- and X-settings so that you can work with flash at all shutter speeds;
  • Fully automatic diaphragm;
  • Single-layer anti-reflection coating;
  • Standardized 77mm filter thread mount for optimized handling with accessories (except the 500/8 lens).

Other short telephoto prime lenses in the Mamiya RB67 system

■Mamiya RB67 mount (13)
Mamiya-Sekor 127mm F/3.8A5 - 3⌀77 1970 ●
Mamiya-Sekor NB 127mm F/3.8A5 - 3⌀77 1973 ●
Mamiya-Sekor C 127mm F/3.8A5 - 3⌀77 1974 ●
Mamiya K/L 127mm F/3.5 LA6 - 40.64m⌀77 1990 ●
Mamiya-Sekor C 150mm F/4 SFA5 - 30.86m⌀77 1977 ●
Mamiya K/L 150mm F/3.5 LA6 - 40.82m⌀77 ●
Mamiya K/L 180mm F/4.5 L-AA4 - 31.10m⌀77 ●
Mamiya-Sekor 180mm F/4.5A5 - 31.11m⌀77 1973 ●
Mamiya-Sekor C 180mm F/4.5A5 - 31.11m⌀77 1974 ●
Mamiya K/L 210mm F/4.5 APO LA7 - 51.43m⌀77 1990 ●
Mamiya-Sekor C 250mm F/4.5A5 - 41.85m⌀77 ●
Mamiya K/L 250mm F/4.5 L-AA5 - 41.85m⌀77 ●
Mamiya K/L 250mm F/4.5 APO LA7 - 51.86m⌀77 1990 ●

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