confusion re: FX & DX lenses

Discussion in 'Photography Beginners' Forum' started by tom beard, Aug 10, 2009.

  1. tom beard

    tom beard TPF Noob!

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    I'm planning to buy a Nikon DX body and two kit lenses 18-105mm and 70-300mm. I loved my Canon SLR 28mm lens and tried to look it up to find the Field of View (FOV). I couldn't find my particular lens but learned the FOV on a 28mm lens was about 76 degrees. That part I understand. Then there was a Nikkor 28mm non zoom that had a maximum of 53 degrees and a Minimum of 74 degrees. I got lost there. Then there is the FX and DX formats. I understand that the FX format is the same size as a 35mm frame, and the DX is smaller. In the lens descriptions, the DX 18-105 zoom equates to an FX (or SLR) 28 to more than 105. Same shift for the 70-300 zoom. This is a little like a Japanese assembly instruction guide. "See Part A and Part 2. Part A is on pg 16 and part 2, page 38 (for FX models, and page56 ((subsection D)) for DX models." Damn, I lost my engineering degree somewhere, but I vaguely understand this.

    Question: Is there anywhere that I could see a photo of an FX and DX sensor side by side; and, is there a conversion chart where I can make a side by side comparison between the FX and DX lens actual fields of view that a non-engineer could understand? I'm presuming that one can't fit an FX lens onto a DX body and vice-versa?? I also can't think in millimeters, centimeters and meters. Just too American I guess. I AM visually oriented...Talent is another question. Any guidance you can steer me to would be greatly appreciated.

    Many thanks as always, Tom Beard
     
  2. PhotoXopher

    PhotoXopher TPF Noob!

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    FX lenses kind of work on DX bodies and DX lenses kind of work on FX bodies.

    The difference is that on a DX sensor your only shooting in the middle section. If you use a DX lens on a full frame sensor you'll need to switch to DX mode or have dark edges.

    If you use an FX fisheye on a DX body you won't get the full effect since it will only capture the middle portion on the sensor.

    I hope I got that right :lol:
     
  3. inTempus

    inTempus TPF Noob!

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    Does this help?

    Black = FX
    Yellow = DX

    [​IMG]
     
  4. tom beard

    tom beard TPF Noob!

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    Tharmsen,
    Thanks, that does it! I understand. My concern about lenses is that with the wide angel (18-105), is that although my old 28mm was very good for interiors, a few degrees wider for tight spaces might be nice, but I could always add that later. with fixed focus glass. The FX-DX photo bumps up my education.
    Thanks again, Tom
     

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