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This is not really a product because despite the air of modernity these lenses are thirty or more years old. Not only that but there is a wide variety of differences amongst similar focal length lenses in all lengths. In the case or R lenses there are three cams from the Leicaflex era on up. In a sense it is like an upgrade because predecessors become obsolete in being capable of working properly in all cases. As a Leicaflex can not operate more than a 1 cam lens except a most modern R can do ROM but not true preceding camera bodies can and so forth. So you have to know if the lens fits the application. A 28mm is wide enough to contain the cost of a wider lens and fits with a 35-70mm zoom. Then you need a 50mm standard and a ninety or above. The SLR prism permits light meter readings through the lens so focal lengths have no bearing on metering capabilities. The condition must read free of internal dust, no mildew, fogging or cleaning marks on or between any of the lens elements. Optics of 8/8.5 is good/9 better with 10 perfect. External barrel wear or cosmetics of black paint worn off or scuffs, scratches and dents should be negligible. Mint is the best. The lens must be clear to see through with a LED flashlight. Avoid haze. The aperture must operate smoothly and the focusing motion of the barrel must be smooth with only light to moderate resistance. Generally a novice should not be over cleaning these lenses and an internal cleaning should be at least supervised by an expert. This lens is a B+ optically and A- cosmetically. it can be used on film R series lenses of R3 and above. An adapter allows for its use on a 4/3 digital format or other SLR's. The glass is German Leitz with the Leica brand that means Leitz Camera. A hood should be included with the lens otherwise they are expensive and difficult to find original. A Series VII filter which drops into the back of the lens hood and then pops onto the front of the barrel is the only filter for this type as determined by serial number not a screw on that may cause flare at the edges in f2.8 or even contact the front element glass bulb. You prove all this by actually using the lens. But then if it an object of desire who really cares used or not aesthetically it is the most beautiful.Read full review
Everyone thinks that a good Leica Lense has to come from Germany. not so! This one was made in Canada, and the optics are sharp, and this lense has great contrast as well.
Do your research before buying your lens. The Leica R 28mm 4th version is known to be the final and best designed lens in this focal length pre aspherical. In my opinion the 4th version R28mm out performs the asph cousin.
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