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Thread: compact zoom lens for slr

  1. #1

    Default compact zoom lens for slr

    i am currently using a bridge camera with a very long zoom (14-24x). i want to upgrade to a dslr or mirrorless slr, but do not want to carry those humongous looking lens that will offer me the kind of telephoto i need.

    what are my options?

  2. #2

    Default Re: compact zoom lens for slr

    None. You cannot want a high focal length lens (400-500mm) in a small package with a large sensor.

    If you want a large sensor with a high focal length lens, you need a big, long lens.

    If you could, those "super-zooms" would alread be extinct.
    Alpha

  3. #3

    Default Re: compact zoom lens for slr

    Want compact size yet want long zoom then you might have to comprimise on Image quality.

    super zoom lens:
    18-200
    18-270
    28-300

    Not enough zoom?
    use a teleconverter for extra reach <---comprimise on image quality.

  4. #4

    Default Re: compact zoom lens for slr

    200mm focal length mean the distance between the sensor (full-frame) and the lens is at least 200mm. In other words, the lens cannot be shorter than 200mm. Similarly, 400mm focal length means lens have to be 400mm or longer in length. To have a shorter lens with same effect, will need a smaller sensor to give you the cropped multiplier effect.

  5. #5

    Default Re: compact zoom lens for slr

    Quote Originally Posted by GRbenji View Post
    200mm focal length mean the distance between the sensor (full-frame) and the lens is at least 200mm. In other words, the lens cannot be shorter than 200mm. Similarly, 400mm focal length means lens have to be 400mm or longer in length. To have a shorter lens with same effect, will need a smaller sensor to give you the cropped multiplier effect.
    No, it means the focal point is at 200mm or at 400mm, not the distance between lens and sensor.
    Alpha

  6. #6

    Default Re: compact zoom lens for slr

    i read somewhere that the m4/3 has a multiplier of 2 - will that mean that if i buy the panasonic 14-150mm, that would be equivalent to my superzoom - 28-300mm?

    just checked the price on another thread, and it is quite expensive. hoping olympus can improve their pen series without increasing the price, their equivalent telephoto is less expensive.

  7. #7

    Default Re: compact zoom lens for slr

    Quote Originally Posted by orson View Post
    i read somewhere that the m4/3 has a multiplier of 2 - will that mean that if i buy the panasonic 14-150mm, that would be equivalent to my superzoom - 28-300mm?

    just checked the price on another thread, and it is quite expensive. hoping olympus can improve their pen series without increasing the price, their equivalent telephoto is less expensive.
    So get the Olympus lens... m4/3 is a standard mount...?
    Alpha

  8. #8

    Default Re: compact zoom lens for slr

    Quote Originally Posted by Rashkae View Post
    No, it means the focal point is at 200mm or at 400mm, not the distance between lens and sensor.
    Huh! If a lens has a focal length of 200mm, isn't it focusing the image at 200mm. Shouldn't the sensor be 200mm from the lens?

  9. #9
    Member enzeru21's Avatar
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    Default Re: compact zoom lens for slr

    Quote Originally Posted by GRbenji View Post
    Huh! If a lens has a focal length of 200mm, isn't it focusing the image at 200mm. Shouldn't the sensor be 200mm from the lens?
    hey hey i really think you should read up abit first.. you seem to be very lost with some of the technical terms in photography...

    try google focal length..
    enzeru21 Canon 500D |Tamron17-50mm f/2.8| Sigma30mm f/1.4 | 580EX II
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  10. #10

    Default Re: compact zoom lens for slr

    Quote Originally Posted by GRbenji View Post
    Huh! If a lens has a focal length of 200mm, isn't it focusing the image at 200mm. Shouldn't the sensor be 200mm from the lens?
    You're half right, half wrong. It's not how many mm from the lens, as the focal point is not at the lens.

    As enzeru21 pointed out, try to read up a bit on what focal length really is.
    Alpha

  11. #11

    Default Re: compact zoom lens for slr

    Quote Originally Posted by enzeru21 View Post
    hey hey i really think you should read up abit first.. you seem to be very lost with some of the technical terms in photography...

    try google focal length..
    I understand perfectly well what focal length is. Thank you,


    Quote Originally Posted by Rashkae View Post
    You're half right, half wrong. It's not how many mm from the lens, as the focal point is not at the lens.

    As enzeru21 pointed out, try to read up a bit on what focal length really is.
    May be you guys want to read this an tell what you know, and where am I wrong.

  12. #12

    Default Re: compact zoom lens for slr

    Quote Originally Posted by GRbenji View Post
    I understand perfectly well what focal length is. Thank you,


    May be you guys want to read this an tell what you know, and where am I wrong.
    Apparently you need to go back to basic maths and retake algebra. In the example above, you will see, by reading the statements, that the "focal length" is f, while the distance between lens and sensor is h. These are 2 different values. This is like a basic secondary school maths question on algebra.

    In other words, you are wrong and misunderstood.

    I suggest you read this:
    http://en.wikipedia.org/wiki/Focal_length

    You will then realize that focal length is the convergence point, not the distance between lens and sensor.
    Alpha

  13. #13

    Default Re: compact zoom lens for slr

    Quote Originally Posted by Rashkae View Post
    Apparently you need to go back to basic maths and retake algebra. In the example above, you will see, by reading the statements, that the "focal length" is f, while the distance between lens and sensor is h. These are 2 different values. This is like a basic secondary school maths question on algebra.

    In other words, you are wrong and misunderstood.

    I suggest you read this:
    http://en.wikipedia.org/wiki/Focal_length

    You will then realize that focal length is the convergence point, not the distance between lens and sensor.
    Please read my very 1st post again then.

    PS - I actually pre-empted that u gonna say this..haha...please don't pick bone in egg for an arguemet. My initial response to TS is very general.
    Last edited by GRbenji; 23rd August 2010 at 12:57 AM.

  14. #14

    Default Re: compact zoom lens for slr

    Quote Originally Posted by GRbenji View Post
    Please read my very 1st post again then.
    I have. And I still state that using "distance between sensor and lens" as a means of focal length is inaccurate, as has been proven by the web links you yourself have posted.

    Lens design and construction matters too. Take a look at a 500mm reflex lens, there is no component in there that is 500mm away from the sensor.
    Alpha

  15. #15

    Default Re: compact zoom lens for slr

    Quote Originally Posted by Rashkae View Post
    I have. And I still state that using "distance between sensor and lens" as a means of focal length is inaccurate, as has been proven by the web links you yourself have posted.

    Lens design and construction matters too. Take a look at a 500mm reflex lens, there is no component in there that is 500mm away from the sensor.
    Never mind, thanks anyway.

  16. #16

    Default Re: compact zoom lens for slr

    Quote Originally Posted by gundamseed84 View Post
    Want compact size yet want long zoom then you might have to comprimise on Image quality.

    super zoom lens:
    18-200
    18-270
    28-300

    Not enough zoom?
    use a teleconverter for extra reach <---comprimise on image quality.
    Agree on this.
    I think the most 'super zoom' on crop dslr should be 18-270.

  17. #17

    Default Re: compact zoom lens for slr

    I think TS choices are limited. Can try the 18-200mm, 55-250mm type of zoom. Light weight and reasonable quality or if using a Canon, go for the 70-300mm DO - a compact zoom (relative).

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