Mamiya-Sekor SFC
f/4 Lens
Mamiya’s long experience and concentrated technology have made possible the
development of the all new
SF C 150mm f/4 Soft Focus Lens. A
special type of spherical aberration has been purposely introduced into this lens to
produce photographic images that are sharp yet which have an alluring softness.
And the highly advanced design using 3 new types of optical glass has made
possible extremely precise correction of all other types of aberrations as in standard
lenses as well as superb color balance.
The soft focus effect is eliminated when this lens is stopped down to f/8 or more so
the same sharp images obtained with standard lenses are available when desired.
And the soft focus effect can be varied at will by using the three different Softness
Control Discs provided with the lens.
Names of Parts
1. Front lens barrel
2. Softness control disc
3. Shutter speed ring
4. Aperture scale ring
5. Depth-of-field preview lever
6. Synchroflash terminal
7. M-X selector
Specifications
Focal length: 150mm
Composition: 5 element, 3 group
Angle of view: 33”
Aperture range: f/4-f/32
Filter: 77mm dia. screw-in type
Lens hood: Screw-in type
Length :
6”
Maximum diameter: 3-l
Weight: 29.6 oz.
Focusing
The special spherical aberration used in this lens to produce the soft focus effect
causes some discrepancy in focusing when this is done at full aperture; therefore,
when focusing always stop this lens down to at least f/8 to cancel the soft focus
effect.
The No. 1 Matte and No. 2 Checker focusing screens are ideal for use with this lens.
The No. 3 Rangefinder Spot or No. 4 Microprism focusing screen may be used,
however, by stopping down to f/8 or more and using the mat area.