answers: 4

  1. i is glorious
    04.11.2023

    Why does the bokeh become harsher in the corners of OKS?

    Reply

    • Rodion
      04.11.2023

      The SfA of inclined beams grows from the center (on the axis it is equal to 0) to the edge of the frame, the edging of the disks increases in accordance with this.

      Reply

  2. Tube
    04.11.2023

    Thank you for the comparative test, it’s so valuable🤝 Can you please tell me, have you tested the Zh-53, isn’t this planar better than OKS? And I would also be grateful if they explained it from the point of view of optics: from a number of lenses with the same schemes, focal lengths and rel. hole, is the highest quality image from the shortest focal length? (Zh-53, 54, etc., for example) I know that the aberrations of an optical system depend quadratically on scaling, so it turns out that the smaller the better?) Do they decrease quadratically?

    Reply

    • Rodion
      04.11.2023

      This is a rather complex question, and it also interests me. But I need time, more experience and, of course, the lenses themselves to conduct tests. So far I have on hand RO2-2M, temporarily this OKS1-75-1 and the very rare RO506-1 80/2 (I’ll adapt it soon), 35KP-1.8/65 (adapted), 35KP-1.8/75 (non-adapted) , but I don’t have a Zh-53 or Zh-54 right now. Probably, Zh-54 will soon come for adaptation too.
      Downscale the circuit, of course, will reduce aberrations, but this only applies to the center of the frame. But at the edges with a short focus a lot of interesting things can come out - in the case of projectionnikovitis it can be a very big problem. I need to do more research in this area.

      Reply

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