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You are here: Home / Nikon Z6/7 / Nikon 58mm f/0.95 Noct on Z7: EFCS effect on OOF PSFs

Nikon 58mm f/0.95 Noct on Z7: EFCS effect on OOF PSFs

July 14, 2024 JimK 2 Comments

LensRentals has loaned me a Nikon 58 mm f/0.95 Noct for testing. In the previous post, I showed you out of focus point spread functions wide open and at f/1.4. Those were made with the mechanical shutter. They were the second set I made. The first set was made using EFCS, and it showed shading:

EFCS

Compare that to the shots with full mechanical shutter:

MS, f/1.4

These were made at 1/1250 second. The shading effect diminishes as the shutter speed gets slower, and gets worse as the shutter speed gets higher.

Fully electronic shutter looks about the same as fully mechanical shutter.

Nikon Z6/7

← Nikon 58mm f/0.95 Noct on Z7: OOF PSFs Nikon 58mm f/0.95 Noct on Z7: Field flatness →

Comments

  1. Bernard Delley says

    July 17, 2024 at 8:31 am

    The EFCS illumination non-uniformity may have nothing to do with the lens PSF. I expect that the fully electronic shutter “curtains” go with quartz clock precision. The mechanical shutter is released by the quartz clock, but on the run its subject to inertia and spring as well as friction forces. On EFCS mode, one has the mechanical issues of the second curtain and the matching of the electronic first “curtain” to the nonuniform mechanical edge travel. I seem to remember one of your oscilloscope studies where a EFCS with two constant velocity sub-intervals was shown.

    Reply
    • JimK says

      July 17, 2024 at 8:35 am

      D’accord.

      Reply

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