This is the "Super-Multi-Coated Macro-Takumar 50mm f/4. Chapter 39

Following up on the series of Tomioka lenses, the last generation of their lenses was intended to be published (the DS-M) until I found a problem and decided to advance with two more interesting Pentax lenses.
Even though this lens is a Macro, but is my walk-around lens.
This lens occurs as a factor of "Inversely proportional to the square of the distance." What's that...?
繼富岡鏡頭系列之後，他們的最後一代鏡頭原本打算發布 (DS-M)，直到我發現問題並決定推出兩款更有趣的賓得鏡頭。
雖然這支鏡頭是微距鏡頭，但它是我的隨身鏡頭。
此透鏡的出現是由於「與距離的平方成反比」。那是什麼...？
Dando continuidade à série de lentes Tomioka, pretendia-se publicar a última geração de suas lentes (a DS-M) até que encontrei um problema e decidi avançar com mais duas lentes Pentax interessantes.
Mesmo que esta lente seja uma Macro, é minha lente de passeio.
Essa lente ocorre com um factor “Inversamente proporcional ao quadrado da distância”. O que é isso...?

[@edward9840]

Thank you for posting. I always learn something from your videos. 👍

[@red_code]

Thank you very much😊

[@seoulrydr]

interesting! I picked up gen 1 at an antique store not knowing it is the most sought after. people forget what these lenses can do in general photography. tyvm for the video!

[@red_code]

Thank you and you are really lucky.

[@classic.cameras]

Absolutely love your videos. So good!

[@red_code]

Thanks for the comment.