Theory of Reciprocity in Aperture priority mode

  • Theory of Reciprocity in Aperture priority mode

    Posted by Shreyas HJ on September 29, 2023 at 3:42 pm

    Hello Sudhir sir,

    Firstly, thank you all the learning tutorials. I recently bught All in one package for my photograhy learning.

    I have started with the courses and I have few qustions on Theory of Reciprocity which is explained using Canon Camera. Where as I have Nikon D5600 and the Shutter speed is starting from 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000, 1/2000 & 1/4000.

    So for understanding Theory of Reciprocity in Aperture priority mode, I am getting little bit of confused as in, if I have to get 1/500 if shutter speed, I should set ISO to higher number.


    Trying to capture Rotating fan(low light/Inside).

    With higher ISO, I am still unable to acheive the still image of Fan and also have Nosies.

    Here I am bit confused.

    Your inputs on this are very much of helpful

    Shreyas HJ replied 8 months, 2 weeks ago 2 Members · 2 Replies
  • 2 Replies
  • Sudhir Shivaram

    September 29, 2023 at 3:55 pm

    Hi Shreyas,

    If you are shooting in low light situation inside a room, chances are you will need a very high ISO (probably not supported by your camera) to achieve a shutter speed of 1/500.

    The approach to achieve it should be:
    – Keep in aperture priority mode.
    – Set the aperture to lowest f number supported by the camera.
    – Set the ISO to say 1000 and check the shutter speed you are getting.
    – Doubling the ISO will double the shutter speed. Use this calculation to get the desired shutter speed.

    Also please feel free to post the test image taken which gives a better understanding on the situation.


  • Shreyas HJ

    October 1, 2023 at 11:58 am

    Hello Sudhir sir,

    thanks for the suggestion. So here I did exactly as suggested by you.

    Setting are as below

    Nikon D5600, 55mm, f5.6, ISO 1000, 1/25s

    I am attaching the sample pic which I took.

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