Lens Question...

Discussion in 'Photography Beginners' Forum' started by spag_187, Mar 9, 2010.

  1. spag_187

    spag_187 TPF Noob!

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    My question is... Will a cheaper lens such as the EF-S 50-250mm IS have the same/similar zoom reach as the more expensive 200mm L models? I assume only the image quality will differ.

    Thanks...
     
  2. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    The zoom/reach (focal length) is right in the name of the lenes.

    250mm is longer than 200mm, so the 50-250mm will give you more 'reach' than a 200mm lens. It's just that simple.

    And yes, if you are comparing the 50-250mm lens to something like a 70-200mm F4 L, then the image quality will be quite different.
     
  3. PJL

    PJL TPF Noob!

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    The functional focal length of the lens also depends on the camera you're using. If you're using a small sensor camera, the EF series L lens will have more zoom than the 250mm EF-S model; in fact, on a 1.6 sensor camera, the visual effect of a ES 200mm L would be the same as a 320mm EF-S lens. This is true for all EF series lenses used on small sensor cameras -- multiply the rated focal length on the lens by 1.6 to get the focal length equivalent.
     
  4. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    NO...not at all.

    The crop factor is for comparing the field of view between 'crop sensor cameras' and 35mm film SLR cameras (or full frame digital). It is not for comparing lenses to one another.

    The maximum focal length of an EF-S 50-250mm lens is 250mm. The maximum focal length of an EF 70-200mm is 200mm. If you set both lenses to 200mm, you will get exactly the same view on the camera. Of course, the EF-S lens will not mount to a film or full frame camera, so it would have to be a crop sensor camera.

    Unless someone has previous experience with 35mm film cameras (or full frame digital) then they should forget about the crop factor. It's only use is for comparison....and they use 35mm film because that was the standard for a few decades.
     
    Last edited: Mar 9, 2010
  5. gsgary

    gsgary Been spending a lot of time on here!

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    If there was a prize for dumbest question of the day this would win
    One is 250mm the other 200mm makes no difference what body you put it on
     
  6. PJL

    PJL TPF Noob!

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    http://www.kenrockwell.com/tech/crop-factor.htm

    It does make a difference what body you put it on. EF-S lenses produce a smaller image so you don't get the crop factor that you would using an EF lens on a small-sensor camera.​
     
  7. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    The crop factor is about the body, not the lens.
    EF-S lenses do have a smaller image circle, but 200mm is still 200mm.
     
  8. Gaerek

    Gaerek TPF Noob!

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    EF-S lenses are designed to be used with cropped frame cameras, but the focal length listed on them is not taking into account the crop factor. An EF-S lens at 50mm is exactly the same focal length as an EF lens at 50mm. If I put each of those lenses on a cropped frame sensor camera, I will get exactly the same focal length on both of them. It will be equivalent to 80mm on a full frame, regardless if the lens is EF or EF-S.
     
  9. PJL

    PJL TPF Noob!

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    OK, I was confused. Thanks for the info. I was always under the impression that using an EF (or FX for Nikon) lens on a small frame camera would mean increased focal length over their EF-S/DX equivalent.

    You don't have to be condescending, Mike. And thanks for the useful response, gsgary.
     
  10. spag_187

    spag_187 TPF Noob!

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    I think this overall discussion might be why I asked the so called "dumbest question of the day". A friend of mine is using a much better camera body (I don't know which model exactly) but when I look at some of his shots that he took with his 200mm L series they look much closer at 200mm then some of mine do with my rebel at 250mm.

    Oh and gsgary...go **** yourself! I don't care if I get booted of the forum. Im asking a question in the beginners area. I don't have the vast knowledge of photography such as a dip-**** like yourself.

    Sorry to have offended anyone here...
     
    Last edited: Mar 9, 2010
  11. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    Wasn't trying to be, sorry.

    I just get a little riled up when I see incorrect information being spread around...especially about the stupid crop factor, which has been discussed to death many, many times.

    :cheers:
     
  12. Dwig

    Dwig TPF Noob!

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    Mike, you are completely correct.

    It is always wrong to say that a camera's crop factor affect the focal length of a lens. Anytime a post makes this false statement its error should be pointed out and corrected. The vast majority of the confusion about crop factor comes from the poor explanations by well meaning but incorrect replies.
     

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