Detemining Focal length of lens by an image

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   How should design a setup for determining the focal length of a CCD in CMOS TDI camera sensor with an integrated lens to determine the focal length of that lens? I want to verify the focal length information that is provided by the manufacturer which is 580mm with FOV 2.4 degrees.

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Huns023 Members Profile Send Private Message Find Members Posts Add to Buddy List Optics GrassHopper Joined: October/25/2019 Status: Offline Points: 3	Post Options Post Reply Quote Huns023 Report Post Thanks(0) Quote Reply Topic: Detemining Focal length of lens by an image Posted: October/25/2019 at 03:41
	How should design a setup for determining the focal length of a CCD in CMOS TDI camera sensor with an integrated lens to determine the focal length of that lens? I want to verify the focal length information that is provided by the manufacturer which is 580mm with FOV 2.4 degrees.

3_tens Members Profile Send Private Message Find Members Posts Add to Buddy List Optics Jedi Master Joined: January/08/2007 Location: Oklahoma Status: Offline Points: 7804	Post Options Post Reply Quote 3_tens Report Post Thanks(0) Quote Reply Posted: October/25/2019 at 10:15
	Not likely to happen from a published image. You have no known measurements for data.
	Folks ain't got a sense of humor no more. They don't laugh they just get sore. Need to follow the rules. Just hard to determine which set of rules to follow Now the rules have changed again.

Huns023 Members Profile Send Private Message Find Members Posts Add to Buddy List Optics GrassHopper Joined: October/25/2019 Status: Offline Points: 3	Post Options Post Reply Quote Huns023 Report Post Thanks(0) Quote Reply Posted: October/25/2019 at 11:21
	I am planning to take the photo myself. I want to know if there is a way by keeping the object at specific distance and capturing can help me calculate the focal length accurately. I want to check if the focal length is correct.

koshkin Members Profile Send Private Message Find Members Posts Add to Buddy List MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 12995	Post Options Post Reply Quote koshkin Report Post Thanks(0) Quote Reply Posted: December/16/2019 at 11:02
	Do you know the pixel pitch of the sensor? If you do, it is easy to calculate. ILya
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