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I have heard of something called a focal length multiplier, particularly in connection with the size of the image sensor in a camera. What I don't understand is what this is and why ans how it is related to the size of the sensor. Can anyone please explain this?

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marked as duplicate by Michael Clark, dpollitt, jwenting, AJ Henderson, Paul Cezanne Aug 28 '13 at 15:44

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
Which bit of the Wikipedia article are you having trouble understanding? –  Philip Kendall Aug 28 '13 at 9:16
    
@SachinKainth - welcome to Photography on Stack Exchange. I see you are very interested in learning about photography and this is a great community in which to do that, however we also have a very large amount of information that has already been answered. We have a search feature that should help you find answers to many of your questions. (I've noticed that about 3/4 of your questions have been duplicates so far, though the other 1/4 have been interesting and seem unique.) –  AJ Henderson Aug 28 '13 at 14:14
    
If you'd like some help with figuring out how to best use the search feature or how to find existing information on the site, please feel free to jump in chat and we should be able to help you reduce the number of duplicate questions that are getting closed and downvoted. And again, welcome. –  AJ Henderson Aug 28 '13 at 14:15
    
Don't worry I will be searching before asking now. –  Sachin Kainth Sep 2 '13 at 12:09

1 Answer 1

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"Focal length multiplier" is another term for "crop factor". It is used for comparing the angle of view of a lens of a given focal length across film or sensor size.

This is explained in more detail at

What is crop factor and how does it relate to focal length?

and the relationship between focal length, sensor size, and angle of view is explained at What is "angle of view" in photography?

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and it's even more of a misnomer in that the focal length does not get multiplied at all. –  jwenting Aug 28 '13 at 13:18

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