Mamiya 7 lenses Because rangefinder design eliminates the large, bulky mirror box of SLR design, lenses can be designed simply and rear elements can easily recess towards the film plane. The result is the possibility of ideal lens designs, which Mamiya s computer-aided optical R&D department crafts with the utmost pride and unsurpassed precision of any medium format system. The Mamiya 150mm f/4.5 is a moderate telephoto, using a unique design of six elements in five groups, along with low and ultra-low dispersion glass to create apochromatic performance matched to the entire group of Mamiya 7 lenses. Item Specifications: Product Description: Mamiya telephoto lens - 150 mm Lens System: Telephoto lens Intended For: Medium format Lens Aperture: F/4.5 Focal Length: 150 mm Min Focus Range: 6 ft Focus Adjustment: Manual Lens Construction: 5 group(s) / 6 element(s) Special Functions: Tele Filter Size: 67 mm Compatibility: Mamiya 7 Shutter Type: Electronic Length: 3.8 in Weight: 18.3 oz