Focal length

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focallength中文

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Having a lens that is heavily recessed into the camera body can make changing lenses slightly more difficult, but other than that the rear focal length is largely of academic interest as far as I can tell.

Focaldistance vsfocal length

This fact is most relevant to SLR cameras that have a mirror which moves out of the way when a photo is taken, a lens that sticks into the camera body could foul the mirror. The C mount is exclusively (to my knowledge) used with cine cameras, microscopes and industrial/surveillance cameras which have no reflex mirror.

FOV tofocal length

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For instance, if I look at these two lenses by Ricoh, they have the same focal length and aperture, but their back focal lengths differ.

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http://industry.ricoh.com/en/fa_security/lens/pdf/2M/FL-CC1614A-2M.pdf http://industry.ricoh.com/en/fa_security/lens/pdf/2M/FL-CC1614-2M.pdf

From what I know back focal length depend of the optical construction of the lens. And it is important for mirror cameras. For example you can't mount EF-S lens on fullframe camera because last element will interfere with the mirror (which is bigger than APC cameras).

They are referring to the amount of clearance between the lens rear element and the sensor. The C mount flange focal distance is 17.52mm so both of these lenses have rear elements that stick into the camera body.

Back focal lengthformula

We believe that the most crucial aspect is to grant scientists access to a wide range of reliable sources and new useful tools that surpass human capabilities. However, we trust in allowing scientists to determine how to construct their own protocols based on this information, as they are the experts in their field.

Our mission is to provide scientists with the largest repository of trustworthy protocols and intelligent analytical tools, thereby offering them extensive information to design robust protocols aimed at minimizing the risk of failures. We believe that the most crucial aspect is to grant scientists access to a wide range of reliable sources and new useful tools that surpass human capabilities. However, we trust in allowing scientists to determine how to construct their own protocols based on this information, as they are the experts in their field.