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F value
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
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4 Replies
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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.
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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
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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.
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That’s correct.
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