Newer lenses can have more complex optical designs which do not require as much lens extension.įocus at infinity my Nikon F mount version is 10.8cm (4.25") tall. Magnification is done through lens extension. Regreasing the helicoid would help, but I don't know how to disassemble the lens. The aperture ring feels inconsistent in resistance. Unfortunately, on my copy of the lens, the grease in the helicoid has begun to dry out. Even moderate changes in focus distance means cranking on the focus ring. There is over 900 degrees of travel in the focus ring. There are half stops between the marked apertures, except between f/16 and f/22.Īll of the numbers and text on the lens have been engraved and then painted. I do not believe that it is nickel-plated brass. I'm not sure if the mount is stainless, nickel, or some other metal. With the exception of the bayonet mount, the lens is all aluminum. Machining was kept to a minimum, in order to keep the original price lower than first-party lenses. The lens is two aluminum tubes joined by a helicoid. Build Quality, Design, and Sample Variationīuild quality is mediocre at best.
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