Sensor size, can someone help?

Discussion in 'Photography Beginners' Forum' started by Lazy Photographer, Sep 18, 2009.

  1. Lazy Photographer

    Lazy Photographer TPF Noob!

    Joined:
    Jul 4, 2009
    Messages:
    648
    Likes Received:
    5
    Location:
    Toronto, Canada
    Can others edit my Photos:
    Photos OK to edit
    I've got a wee point & shoot Panasonic that has a small sensor (1/2.5"). Does anyone know what the crop factor would be for such a small sensor? I'm trying to figure out what the 28mm end of my lens equates to in 35mm format. Any help would be greatly appreciated.
     
  2. ErectedGryphon

    ErectedGryphon TPF Noob!

    Joined:
    Sep 9, 2009
    Messages:
    333
    Likes Received:
    0
    Location:
    Houston, TX
    Can others edit my Photos:
    Photos NOT OK to edit
    P&S cameras are funny when it come to focal lengths and sensors, the easy explination is the companies make it up as they go... mostly using terms like 40X optical. Heres a link to an article (based on DSLR) that might clear it up a little;
    The "Multiplier Factor" - Lonestardigital.com
     
  3. Lazy Photographer

    Lazy Photographer TPF Noob!

    Joined:
    Jul 4, 2009
    Messages:
    648
    Likes Received:
    5
    Location:
    Toronto, Canada
    Can others edit my Photos:
    Photos OK to edit
    Thanks. Since posting the question I found some specs on my camera that say the 28mm wide end is equivalent to 37mm. But can that be true? The sensor on a D90 is 1.6 crop, so a 28mm lens would be equivalent to 44mm, no? On a camera like mine, with a much smaller sensor, I would think the crop factor would be way bigger. Then again, maybe the smaller lens play into it somehow. I just don't know.
     
  4. ErectedGryphon

    ErectedGryphon TPF Noob!

    Joined:
    Sep 9, 2009
    Messages:
    333
    Likes Received:
    0
    Location:
    Houston, TX
    Can others edit my Photos:
    Photos NOT OK to edit
    I would say, the smaller lense is likely rated as an "Equivilent" the 28mm is the focal point from the film/sensor surface, is the P&S lens even 28mm long physically?
     
  5. ErectedGryphon

    ErectedGryphon TPF Noob!

    Joined:
    Sep 9, 2009
    Messages:
    333
    Likes Received:
    0
    Location:
    Houston, TX
    Can others edit my Photos:
    Photos NOT OK to edit
    These two books actually have good explanations in them;

    PCPhoto Digital SLR Handbook
    PCPhoto Digital Zoom Camera Handbook

    Both by Rob Sheppard.

    Wish I could find you some better, free online resources, but my google isnt turning up much either.

    I have read the books though.
     
  6. Dwig

    Dwig TPF Noob!

    Joined:
    Mar 11, 2009
    Messages:
    1,261
    Likes Received:
    0
    Location:
    Key West FL
    Can others edit my Photos:
    Photos NOT OK to edit
    There is absolutely no way that 28mm is the wide end of the zoom on any P&S camera with a 1/2.5" sensor. Either there's a big misprint in the specs you read or you have mis-read them.
     
  7. KmH

    KmH Helping photographers learn to fish Supporting Member

    Joined:
    Apr 9, 2009
    Messages:
    38,237
    Likes Received:
    5,008
    Location:
    Iowa
    Can others edit my Photos:
    Photos OK to edit

Share This Page