Ricoh has a new patent application released on May 30, which includes several optical lens designs/calculations: 70-150mm f/4.6-5.7 100-170mm f/4.6-5.2 70-180mm f/4.1-6.1 150-250mm f/5.3-7.9 Additional informtion: [Publication number] P2025083507 [Release date] 2025-05-30 [Name of invention] Zoom lens, lens barrel and imaging device [Application date] 2025-03-14 [Show division] Division of P 2021020788 [Original application date] 2021-02-12 … Continue reading New patent application for Pentax 70-150mm, 100-170mm, 70-180mm, and 150-250mm lenses