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Old 15-01-2010, 16:12   #1 (permalink)
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Daft question number 3, are focal lengths of lenses larger on DSLRs?

Good afternoon,

I was talking to a friend at work who has a Sony Alpha DSLR, now he was saying that digital SLRs increase the focal length by approximately 60%, i.e. on a lens set at 100mm on a 35mm SLR that equates to 160mm on a DSLR.

Is this correct? surely 100mm is 100mm in any language.

Thanks all,

Noel.
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Old 15-01-2010, 16:27   #2 (permalink)
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Re: Daft question number 3, are focal lengths of lenses larger on DSLRs?

Yes - and no!

dSLRs fall into two camps. Full frame (FF) and crop factor. The FF cameras have sensors that are the same size as a 35mm frame, crop factor cameras have smaller sensors and to get the 35mm equivalent you have to multiply the focal lengths of any lens by 1.6. Therefore the traditional standard 35mm lens of 50/55mm becomes a 30/35mm lens on a crop factor body.

10mm becomes 16mm and as you say, 100 becomes 160mm.

Some Canon 1D models have 1.3 crop factor sensors.

dSLRS with FF sensors do not affect the focal lengths at all - they remain at what it says on the tin.
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Old 15-01-2010, 16:28   #3 (permalink)
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Re: Daft question number 3, are focal lengths of lenses larger on DSLRs?

You are correct! The focal length is an optical property of the lens, irrespective of what camera it is attached to.

The confusion arises because sensors smaller than full-frame effectively crop the image, so they actually waste the outer parts of the image projected by a full-frame lens and therefore appear to give greater magnification. It is actually a "crop factor" rather than any change in the focal length or anything else.
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Old 16-01-2010, 10:43   #4 (permalink)
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Re: Daft question number 3, are focal lengths of lenses larger on DSLRs?

Quote:
Originally Posted by Dabhand16 View Post
, crop factor cameras have smaller sensors and to get the 35mm equivalent you have to multiply the focal lengths of any lens by 1.6.
1.5x for Nikon ?
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Old 16-01-2010, 11:21   #5 (permalink)
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Re: Daft question number 3, are focal lengths of lenses larger on DSLRs?

Yep, and 1.3x for the APS-H sensors on the 1D (as opposed to 1Ds).
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Old 17-01-2010, 07:11   #6 (permalink)
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Re: Daft question number 3, are focal lengths of lenses larger on DSLRs?

Thanks chaps.
That makes sense now.
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