The Promaster Spectrum 100m f3.5 Macro is a very lightweight (possibly too lightweight?) autofocus macro lens for Nikon F mount cameras. The lens barrel is all plastic, and I'm not talking about that fancy premium plastic, I'm talking about plastic plastic; focus ring feel is survivable but far from luxurious. Fortunately, the optics are good, and this lens will provide up to half lifesize magnification without extension tubes.