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Thread: what's the purpose of getting ~ 28-70mm f2.8 lens

  1. #1

    Default what's the purpose of getting ~ 28-70mm f2.8 lens

    after buying my first lens - 70-200mm to shoot action scenes, i realized i needed one that is wider to shoot group awarding shots. at first i thought that a all in one lens should do the trick (18-200 or similar). until i saw a thread here discussing the ~28-70mm or the wider ~16-55mm. i am just wondering why would u need a fast (f/1.x ~ f/2.8) lens at this short focal length given that you can use the flash to Illuminate the subject.

    Sorry this could be the silly question of the day. what can these fast (and expensive) lens do at these focal lengths that the similar kit lens cannot?

  2. #2

    Default Re: what's the purpose of getting ~ 28-70mm f2.8 lens

    Other than getting the exposure right. There is also the DOV factor to consider when getting those expensive fast lens .

    DOV = Depth Of View . U see those artistic shots where the background and only the subject is clear , ( only see Rooney screaming and the fans not in focus ) that is one of the +pt of fast lens other than getting the exposure .

    Hope this helps .

  3. #3

    Default Re: what's the purpose of getting ~ 28-70mm f2.8 lens

    It's DOF not DOV.

    And 28-70 is an old design, it's 24-70 now.

  4. #4

    Default Re: what's the purpose of getting ~ 28-70mm f2.8 lens

    Ya its DOF Depth Of Field . My bad sorry sorry , many thanks for pointing out .

  5. #5

    Default Re: what's the purpose of getting ~ 28-70mm f2.8 lens

    1) In some places, flash is not allowed
    2) Alot of times, using natural light is better than using flash
    3) Shallow DOF

  6. #6

    Default Re: what's the purpose of getting ~ 28-70mm f2.8 lens

    FF? Crop?

  7. #7

    Default Re: what's the purpose of getting ~ 28-70mm f2.8 lens

    Quote Originally Posted by foongmui View Post
    FF? Crop?
    what's your question regarding?

  8. #8

    Default Re: what's the purpose of getting ~ 28-70mm f2.8 lens

    i have a crop body

  9. #9
    Senior Member ZerocoolAstra's Avatar
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    Default Re: what's the purpose of getting ~ 28-70mm f2.8 lens

    with the kit lens, you get quite a lot of things in focus (due to the relatively deep DOF).
    That's not so nice when you wanna isolate the subject from the background a bit.

    Also, if you're shooting indoors and want to capture ambient light in the background, you'll probably find a large aperture useful to capture more light, unless you can hold the camera steady for a few seconds
    Exploring! :)

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