Product
Orion-15 28mm f/6 is a manual focus wide angle lens for 35mm rangefinder cameras.
Optical design
Not the best in terms of aperture. Has 7 aperture blades, mid-grade lenses usually have this amount of blades. Having rounded blades provides out of focus circle shape closer to a circle.
Physical characteristics
With a lens filter diameter of 40.5 mm you are one step from the next standard filter size, buy step-up ring and bigger filter but you can chose from plenty options. 30 mm long, this small lens should be always in the camera bag. Weights 80 grams so convinient to carry.
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