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Thread: 50mm on crop frame => more?

  1. #1

    Default 50mm on crop frame => more?

    i read abt this crop factor thing,
    my impression that i can is say im using a 1000D which is a 1.6x crop factor


    somehow i fixed on a 50mm lens the focal length will become 75 or something like that??

    i somehow just dun understand abt this 35mm film and crop stuff...


    can explain to me in a more laymen term?

  2. #2

    Default Re: 50mm on crop frame => more?

    Google or wiki for a good answer. Basically, Canon EOS 1000D uses a smaller sensor compared to a full frame, thus what you capture using the same focal length lens will be different. 1000D having a narrower field of view (more zoom in).

    http://en.wikipedia.org/wiki/Crop_factor

  3. #3

    Default Re: 50mm on crop frame => more?

    thats exactly what i googled leh...

  4. #4

    Default Re: 50mm on crop frame => more?

    Erm. in that case, what you dont understand? the illustration provides a good understanding of crop factors already.

  5. #5

    Default Re: 50mm on crop frame => more?

    Perhaps, a video may explain more clearly. watch from 2:56 onwards for explanation of crop factor

    Video Unplayable
    Last edited by chiangkxv; 25th October 2010 at 04:02 PM.

  6. #6
    Senior Member ZerocoolAstra's Avatar
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    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by alancwr View Post
    thats exactly what i googled leh...
    how much more layman must it be?

    anyway since you have no prior experience in using a 35mm film camera, then the issue of crop factor is less of a 'bother' for you. It doesn't really matter whether a 50mm lens gives you 75, or 80, or 200, as long as you are comfortable with the field of view you get when you mount this lens onto YOUR 1000D and take a photo with it.
    Exploring! :)

  7. #7
    Senior Member giantcanopy's Avatar
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    Default Re: 50mm on crop frame => more?

    The lens is like a projector projecting an image.
    The sensor is like a projector screen.
    If the projector screen is smaller ie. like a cropped sensor , then what you recieve is an image that is less wide * ( looks as if the image was taken with a longer focal length )


    The full frame sensor sees the larger picture as shown, the cropped sensor will see the central crop area ( depending on the size of sensor that affects the crop factor )

    Ryan

  8. #8

    Default Re: 50mm on crop frame => more?

    I supposed that a 1000d will have a smaller field of view compared to full frame?

  9. #9
    Moderator daredevil123's Avatar
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    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by alancwr View Post
    I supposed that a 1000d will have a smaller field of view compared to full frame?
    Yes...

    a 50mm lens on a 1000D will give you a FOV (field of view) similar to a 80mm lens on a full-frame 35mm camera.

    50 x 1.6 = 80.

  10. #10

    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by alancwr View Post
    I supposed that a 1000d will have a smaller field of view compared to full frame?
    Yes of course, that's where the 1.6X comes in, full frame = no crop, 1.6X = 1.6X crop compared to full frame.

  11. #11

    Default Re: 50mm on crop frame => more?

    Of course, all this information is "good to know" but it's not necessary to know, unless you're into the technicalities of everything.

    After all, given that your kit lens is 18-55mm (i presume), then you can figure out how much more or little focal length you need based on that.
    Olympian

  12. #12

    Default Re: 50mm on crop frame => more?

    After reading up again on different sites
    I figured that a dslr will a crop factor will naturally take a picture
    But will be so called smaller in size compared to a full frame

    Subsequntly when enlarge the cropped picture will somehow look bigger
    Therefore explain the bigger picture?

  13. #13

    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by alancwr View Post
    After reading up again on different sites
    I figured that a dslr will a crop factor will naturally take a picture
    But will be so called smaller in size compared to a full frame

    Subsequntly when enlarge the cropped picture will somehow look bigger
    Therefore explain the bigger picture?
    I can understand what you're trying to say- but your English, well, needs to improve if you are going to be understood on a regular basis... and um, some of the terms are used wrongly.
    Olympian

  14. #14

    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by alancwr View Post
    After reading up again on different sites
    I figured that a dslr will a crop factor will naturally take a picture
    But will be so called smaller in size compared to a full frame

    Subsequntly when enlarge the cropped picture will somehow look bigger
    Therefore explain the bigger picture?
    Yea the idea is there, don't have to make us understand. If you yourself understand then its good enough.

  15. #15

    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by candycaine View Post
    I can understand what you're trying to say- but your English, well, needs to improve if you are going to be understood on a regular basis... and um, some of the terms are used wrongly.
    hmmm, the idea is there right???

  16. #16

    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by spree86 View Post
    Yea the idea is there, don't have to make us understand. If you yourself understand then its good enough.
    haha okay okay thanks for all the trouble everybody

  17. #17

    Default Re: 50mm on crop frame => more?

    hmmm now is the next question judging from what i understand..i believe ppl should rather get a camera which has a crop factor?since it kind of "magnify" what u see

    but why would ppl still get full frame?

  18. #18

    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by alancwr View Post
    I supposed that a 1000d will have a smaller field of view compared to full frame?
    a better word would be "narrower"

    and this is with the qualifier that the same focal length is used.

  19. #19

    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by alancwr View Post
    hmmm now is the next question judging from what i understand..i believe ppl should rather get a camera which has a crop factor?since it kind of "magnify" what u see

    but why would ppl still get full frame?
    Wider angles, better performance at higher ISO (less noise), higher dynamic range, shallower DOF etc... Not everyone wants it narrower or magnified, depends on the needs of the photographer
    Last edited by spree86; 25th October 2010 at 11:30 PM.

  20. #20

    Default Re: 50mm on crop frame => more?

    Quote Originally Posted by spree86 View Post
    Wider angles, better performance at higher ISO (less noise), higher dynamic range etc... Not everyone wants it narrower or magnified, depends on the needs of the photographer
    wider angles is a moot point.

    the widest rectilinear lens for a full frame camera is 12mm.

    the widest rectilinear lens for a crop frame camera is 8mm. with 1.5x crop factor, that's... 12 mm hey presto.

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