Leica Lenses - field of view

Discussion in 'Leica M Forum' started by christilou, Nov 6, 2010.

  1. christilou

    christilou SC Hall of Famer

    Jul 13, 2010
    Sunny Frimley
    I'm hoping someone can help me with the above M? lenses for the Leica M8/9. If I were to buy a 35mm lens or 50mm lens etc., would the fov be the same on a Sony NEX APS-C sensor? I've become rather confused having used m43rds and now using old Contax G lenses on the NEX. 45mm and 90mm ranges on the Contax G lenses are not the same fov on the NEX. They are longer I think? Anyway, now I'm looking for a bit of clarity here :confused:
     
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  2. deirdre

    deirdre SC Top Veteran

    652
    Sep 26, 2010
    Well, a 35mm or 50mm is always a 35mm or 50mm lens. What's different is effective focal length. m43s has a crop factor of 2, so they'd be equivalent to 70mm and 100mm on m43. Sony NEX has a crop factor of 1.5, so it'd be 52.5mm and 75mm.
     
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  3. BillN

    BillN SC Hall of Famer

    Aug 25, 2010
    S W France
    Bill
    Chistina

    Is it the crop factor that you are after for the NEX

    the M9 = 1 (i.e. it is true 35mm), as is say the Nikon D700
    the M8 = 1.3
    the DX sensor on the Nikon, say the D300 = 1.5 plus a bit, maybe 1.6
    M43 = 2

    etc.

    APS-C - Wikipedia, the free encyclopedia

    but some argue about FOV not being the same as say a 50mm lens on an M43 which would be 100mm

    (answered at the same time as deirdre)
     
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  4. BillN

    BillN SC Hall of Famer

    Aug 25, 2010
    S W France
    Bill
    Another thing to note, Christina, is that if you are using a lens made for a Film Rangefinder Camera, or indeed a film SLR, that when you use this lens on a "cropped" sensor only part of the lens is really in view, i.e. used - (so I have read anyway).

    The reverse of this is seen when you use a lens designed for the Nikon DX sensor, (i.e. the DX range of lenses), on a FF, (full frame 35mm), Nikon - the lens only uses part of the sensor and this can be seen in the image that is produced
     
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  5. christilou

    christilou SC Hall of Famer

    Jul 13, 2010
    Sunny Frimley
    Thanks for the replies Bill and Deirdre. I realize now where I began to get confused. I thought that the M9 was APS-C sensor and now I see that it's full frame! :doh: Now it's making more sense to me :redface:
     
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  6. deirdre

    deirdre SC Top Veteran

    652
    Sep 26, 2010
    Ahh, yes, the M9 is definitely full frame.
     
  7. Streetshooter

    Streetshooter Administrator Emeritus

    Jul 12, 2010
    Philly, Pa
    And how sweet it is!
     
  8. christilou

    christilou SC Hall of Famer

    Jul 13, 2010
    Sunny Frimley
    Now then, don't set us all off again with the "wants" :biggrin:
     
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  9. BBW

    BBW Administrator Emeritus

    Jul 7, 2010
    betwixt and between
    BB
    I can't hear them, Christina.
     
  10. christilou

    christilou SC Hall of Famer

    Jul 13, 2010
    Sunny Frimley
    Ahh, you must be getting a little hard of hearing then BB:rofl: