The SMC Pentax-A 35–105mm f/3.5 is a manual-focus, constant-aperture zoom lens introduced in 1984 and produced until 1989, designed for full-frame K-mount film cameras. Often nicknamed the “stack of primes”, it was Pentax’s flagship zoom of the A-series era, offering a rare combination of optical quality, build, and macro versatility in a single package. It features a 15-element/13-group optical design, Super Multi-Coating (SMC), and a 6-blade automatic diaphragm. The lens maintains a constant f/3.5 aperture throughout its zoom range, stopping down to f/22, and focuses down to 1.5 meters in standard mode. A dedicated macro mode—accessible at all focal lengths—reduces the minimum focus distance to ~30 cm at 35 mm, delivering up to 0.25× magnification. It uses a 67mm filter thread, weighs 615g, and measures 70 × 98mm. It includes an “A” setting on the aperture ring, enabling full automation on compatible Pentax bodies.

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Release Date: 1984
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