[Answered] Increasing the focal length in a telephoto lens by a factor of nine, while keeping the aperture size ...

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Author Question: Increasing the focal length in a telephoto lens by a factor of nine, while keeping the aperture size ... (Read 153 times)

09madisonrousseau09

Hero Member
Posts: 559

on: Jul 28, 2018

Increasing the focal length in a telephoto lens by a factor of nine, while keeping the aperture size constant, will change the f-number by what factor?
a. 1/3
c. 9
b. 1/9
d. 3

Question 2

Decreasing the aperture diameter of a camera lens by a factor of three will change the f-number by what factor?
a. 3
c. 1/9
b. 9
d. 1/3

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meltdown117

Sr. Member
Posts: 326

Reply #1 on: Jul 28, 2018

Answer to Question 1

C

Answer to Question 2

A

09madisonrousseau09

Hero Member
Posts: 559

Reply #2 on: Jul 28, 2018

meltdown117

Sr. Member
Posts: 326

Reply #3 on: Jul 28, 2018

You're welcome

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Author Question: Increasing the focal length in a telephoto lens by a factor of nine, while keeping the aperture size ... (Read 153 times)

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