Mamiya K/L 250mm F/4.5 APO L

Short telephoto prime lens • Film era • Discontinued

Mamiya K/L 250mm F/4.5 APO L
  • Announced:
  • · 1990
  • Production status:
  • ● Discontinued
  • Country of design:
  • · Japan
  • Original name:
  • · APO Mamiya K/L 1:4.5 f=250mm L
  • Class:
  • · Slow 6x7 medium-format short telephoto prime lens
  • · Professional model (Top class)
  • System:
  • · Mamiya RB67 (1970)

Abbreviations

APO Apochromatic optical design.

Model history (2)

■Mamiya APO-Sekor Z 250mm F/4.5A7 - 51.86m⌀77 1988 ●
■Mamiya K/L 250mm F/4.5 APO LA7 - 51.86m⌀77 1990 ●

Specification

Optical design:
Medium format 6x7
250mm
F/4.5
7 elements in 5 groups
2 ULD, 1 AD
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:
X sync
Flash sync terminal:
Yes
Focusing:
1.86m
1.564m
1:5.26
Focusing modes:
Manual focus only
Manual focus control:
None; focusing from the camera
Physical characteristics:
1370g
⌀97.2×137.8mm
Accessories:
Screw-type 77mm
Screw-type round
Not available

Sources of data

  • Manufacturer's technical data.
  • Mamiya interchangeable lenses for Mamiya RB67 Professional instructions.
  • Mamiya RB67 Pro-SD system accessories chart.
  • Mamiya RB67 Pro-SD booklet (2 ED., PUB. 2112).
  • Mamiya medium format cameras booklet.
  • Mamiya medium format cameras booklet (PUB. 9012).
  • Mamiya medium format cameras booklet (PUB. 9022).
  • Mamiya RB67 Pro-SD booklet (13 ED., PUB. 2112).

Manufacturer description #1

Similar to the 210mm f/4.5, the 250mm f/4.5 combines two lenses which use ultra low dispersion glass with one that uses anomalous dispersion glass, thus producing similar image quality, with less chromatic aberrations.

The 250mm also features high contrast and resolving power. Spherical aberrations and fluctuations to curvature of the field during short distance photography have been remedied, preventing image deterioration. Pincushion distortion is less than 1%.

Manufacturer description #2

The 250mm f/4.5 utilizes ultra-low dispersion glass and computer aided seven element, five group design to eliminate chromatic abberation common to telephoto lenses over 200mm focal length. Resolution, color reproduction and overall sharpness are enhanced at all apertures because chromatic abberation is eliminated. Applications include wildlife, sports, landscape, industrial, fashion and beauty.

Mamiya K/L series

The third generation of lenses designed for Mamiya RB67 series medium format 6x7 SLR cameras. Introduced with the Mamiya RB67 Professional SD in 1990.

  • Newer designs optically identical to the RZ67 M series lenses;
  • Mechanical Seiko #1 leaf shutter;
  • All shutter speeds up to 1/400 sec. synchronized automatically for electronic flash;
  • Fully automatic diaphragm;
  • Multi-layer anti-reflection coating;
  • Standardized 77mm filter thread mount for optimized handling with accessories.

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

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