All works, shutter speed accurate.
With 2 lens 80MM F2
Some link for reference
https://photoblog.hk/73362/%EF%BC%BB%E8%AE%80%E8%80%85%E6%8A%95%E7%A8%BF%EF%BC%BDnorita-66-%E6%AE%9E%E8%90%BD%E7%9A%84%E6%98%8E%E6%98%9F/
https://medium.com/%E8%AE%8A%E6%88%90%E7%9B%B8%E6%A9%9F%E7%9A%84%E7%94%B7%E4%BA%BA/%E7%A1%AC%E6%B4%BE%E6%97%A5%E7%B3%BB%E5%9D%A6%E5%85%8Bnorita-66-with-80mm-f2-e8235895ff3f