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Thread: sensor size and focal length

  1. #1
    Senior Member danlindberg's Avatar
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    sensor size and focal length

    I have tried a search but....I'll ask here instead.

    Is there a simple way to calculate different focal lengths so that I can understand them in 35mm terms?

    Hasselblad is offering three different sizes (I think) of their sensors, therefore it would be nice to know how the 35-90 would change depending on choice of sensor.

    Maybe a rookie question, but would a large format 50 lens, a medium format 50 lens and a 35mm 50 lens all "be the same" on any given digital back?

  2. #2
    Senior Member yaya's Avatar
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    Re: sensor size and focal length

    Mamiya 645 lenses

    Check the 5th row from the bottom where it gives the equivalent 35mm focal length

    This tool can also be useful: DOF master

    Yair
    Yair Shahar | Product Manager | Phase One | Mamiya Leaf
    e: [email protected] | m: +44(0)77 8992 8199 | yaya's blog

  3. #3
    Alexander DeVoe
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    Re: sensor size and focal length

    http://www.captureintegration.com/?s...gth+calculator


    By far the best calculator that I have seen. Lets you compare all of the sensor sizes at one time (down to FF 35mm). Thanks CI!

    -Alex

  4. #4
    Senior Member danlindberg's Avatar
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    Re: sensor size and focal length

    Superb!! This was exactly what I was looking for. Thanks a lot

  5. #5
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    Re: sensor size and focal length

    You're very welcome. Of course now you're morally obligated to buy a Phase One instead of a Hasselblad.



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  6. #6
    Alexander DeVoe
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    Re: sensor size and focal length

    Quote Originally Posted by dougpetersonci View Post
    You're very welcome. Of course now you're morally obligated to buy a Phase One instead of a Hasselblad.

    Haha, good try. That vertical grip with built in flash sync to 1/1600 is a bit more convincing however. hah.

    -Alex

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    Re: sensor size and focal length

    Quote Originally Posted by danlindberg View Post
    Maybe a rookie question, but would a large format 50 lens, a medium format 50 lens and a 35mm 50 lens all "be the same" on any given digital back?
    Yes absolutely. The only thing that matters is the sensor size and the focal length. Whether an SLR lens or a large format lens does not matter.

    The only caveat is when you start using Technical Cameras (e.g. Cambo Wide RS) and you're able to stitch 2 or more images (without moving the lens) you're "effectively" increasing the size of the sensor. Then you need to consider the movements involved.

  8. #8
    Member Analog6's Avatar
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    Re: sensor size and focal length

    Quote Originally Posted by Alexander DeVoe View Post
    http://www.captureintegration.com/?s...gth+calculator


    By far the best calculator that I have seen. Lets you compare all of the sensor sizes at one time (down to FF 35mm). Thanks CI!

    -Alex
    Thanks you for that link Alex, it is exactly what I have been looking for. I have downloaded it. I've been trying to work out how my lenses used on the P20 sensor size compared to 6x6 and that does it just beautifully.
    Odille

    H2 | P20 | HC 50-110 | HC 150 f3.2 | HC 210 f4 ~ My Website

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