![field of view - How to calculate the correct focal length needed for a subject of a given size and distance? - Photography Stack Exchange field of view - How to calculate the correct focal length needed for a subject of a given size and distance? - Photography Stack Exchange](https://i.stack.imgur.com/t66NU.png)
field of view - How to calculate the correct focal length needed for a subject of a given size and distance? - Photography Stack Exchange
![How do aperture and focal length affect the DOF or exposure on different sized sensors? | Tyson Robichaud Photo-blography How do aperture and focal length affect the DOF or exposure on different sized sensors? | Tyson Robichaud Photo-blography](https://tysonrobichaudphotography.files.wordpress.com/2012/07/dof1.jpg)
How do aperture and focal length affect the DOF or exposure on different sized sensors? | Tyson Robichaud Photo-blography
![The value of the focal length of the lens is equal to the value of the image distance when rays are (A) Passing through optical center(B) Parallel to the principal axis.(C) Passing The value of the focal length of the lens is equal to the value of the image distance when rays are (A) Passing through optical center(B) Parallel to the principal axis.(C) Passing](https://www.vedantu.com/question-sets/5e1c89c0-8591-4536-944d-fabfebe37bbe5538049956207025842.png)