This sale is for a complete set of mint condition and probably unused Soft Focus Discs No. 1, 2 and 3 for the Mamiya RB67 ProSD 150mm f4.0 SF lens, complete with original storage case.
These soft focus discs are probably unused and certainly unmarked. These discs fit inside the 150mm f4 SF lens to give a variable soft focus effect. Examples can be seen in the manual for this lens, found in the Downloads section.
Mamiyas long experience and concentrated technology have made possible the development of the Mamiya-Sekor SF C 150mm f4 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 colour balance. You CANNOT get the same effect mucking about in Photoshop. Close, perhaps (with a lot of work on each image you shoot), but not the same. This is the real deal.
The soft focus effect is eliminated when this lens is stopped down to f8 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 available for the lens.
The degree of soft focus effect varies depending on whether or not the Softness Control Discs are used and in accordance with which of the three Discs is used. The amount of effective softness, however, will also depend on the type of subject, distance, lighting conditions, the amount of enlargement given the negative, the concept, personal likes, etc.