Pentax K 30/2.8: ad

Advertisement of the Pentax K 30/2.8 (source):

And separately, optical design:

This is probably the most mysterious of all my lenses (see 1, 2, 3).

And something I hadn't noticed before. This lens was part of the K-series since 1975 with the name SMC PENTAX 1:2.8/30. After the introduction of the M-series in 1977, it was not replaced by an M lens, but changed name to SMC PENTAX 1:2.8 30mm (M-style, but without the letter M). I have exactly the first version (1:2.8/30) from 1975-1977.

See also related notes:

• Pentax Super A: My new film camera (2025-04-21)
• Developing a color C-41 film as a B&W negative (2024-11-23)
• Pentax K 30/2.8: "Wide angle photographic lens" patent (2024-04-21)
• Pentax K 30/2.8: Samples [1] - FF (2024-02-27)
• Pentax K 28/3.5 vs Pentax K 30/2.8 [1] - FF (2024-01-31)
• Lenses without cemented elements (2023) (2023-10-12)
• Pentax K 30/2.8 vs Pentacon 30/3.5 (2023-10-10)

Image albums:

• Pentax K 30/2.8