# Episode 226 - Lens Tetralogy II - Normals Page: https://stenobird.com/podcast/classic-camera-revival-515051/episode-226-lens-tetralogy-ii-normals Text version: https://stenobird.com/podcast/classic-camera-revival-515051/episode-226-lens-tetralogy-ii-normals.md Podcast: [Classic Camera Revival](https://stenobird.com/podcast/classic-camera-revival-515051) Published: 2026-06-23T10:30:00+00:00 Episode link: https://classiccamerarevival.podbean.com/e/episode-226-lens-tetralogy-ii-normals/ Audio file: https://mcdn.podbean.com/mf/web/vicadyssnp95cyrg/Ep226-LT2Normals.mp3 Processing state: not_requested JSON: https://stenobird.com/v1/public/podcasts/classic-camera-revival-515051/episodes/episode-226-lens-tetralogy-ii-normals Duration seconds: 3983 ## Resource While everyone always associates the term "normal lens" with the 50mm focal length, here at CCR, we're going with more of a range between 28mm and 60mm. In reality, normal human vision ranges from 31mm to 43mm, which can be difficult to replicate with readily available lenses. So on today's episode, we're featuring the Pentax-M 40mm, AF Nikkor 35mm, Leica Summicron 50mm, AI-S Nikkor 28mm, Zuiko 35mm, Biotar 58mm, Yashinon 50mm, Takumar 55mm, Pentax-FA 31mm, Pentax-FA 43mm, and Voigtländer 58mm. ## Actions - request_transcript: `POST https://stenobird.com/v1/public/podcasts/classic-camera-revival-515051/episodes/episode-226-lens-tetralogy-ii-normals/transcription-requests` — Idempotently request low-priority transcript generation for this episode. - read_markdown: `GET https://stenobird.com/podcast/classic-camera-revival-515051/episode-226-lens-tetralogy-ii-normals.md` — Read the agent-friendly Markdown representation of this episode resource. A page view does not enqueue transcription. Agents should invoke `request_transcript` explicitly when they need this episode processed. ## Transcript Full transcripts are not published on public pages unless there is a clear rights basis.