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  F value

  Posted by Deepak Bhatia on September 25, 2024 at 7:33 am

  Hello Sudhir Sir,

  I have 18-300mm lens on my D7500 Nikon camera. When I keep my lens at 18mm and change the f value or aperture. Now I change the Zoom to say 100 mm. So my f value will change. How f value change from aperture button and zoom are related ?

  Thanks

  Deepak Bhatia

  Sudhir Shivaram replied 1 month, 4 weeks ago 3 Members · 4 Replies
• 4 Replies

• 

  Ravi Jain

  Member

  September 25, 2024 at 2:46 pm

  That’s because of the technical limitations in lens construction for the regular entry level lenses. The max aperture will be smaller (or the min f number will be higher) for higher zooms. For the higher priced lenses, the max aperture remains same whatever the zoom.

• 

  Sudhir Shivaram

  Administrator

  September 28, 2024 at 11:23 am

  Please do check the specifications of the lens. It says 18-300 f3.5-5.6. Which means at the lower end of the zoom the lowest f value you can set is 3.5 and when you soom to 300mm the lowest f value supported is 5.6

  • 

    Deepak Bhatia

    Member

    September 28, 2024 at 11:29 am

    Thanks Sudhir Sir, so at 300 mm, my f value will go from f5.6 to f22. At 18mm, it will be from f3.5 to f22.

    • 

      Sudhir Shivaram

      Administrator

      September 28, 2024 at 12:14 pm

      That’s correct.

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