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Thread: Fixed vs Variable maximum aperature...

  1. #1

    Default Fixed vs Variable maximum aperature...

    Fixed vs Variable maximum aperature

    Eg. 70-200 F2.8 or F4 vs 100-400 F4-5.6

    Is there any difference between a fixed maximum aperature lens and a variable maximum aperature lens? Without taking the quality of the glasses into account, or the focal length...

    I know the advantage of the former is allowing more light in at the longer end of the focal length.

    Searched for this topic quite long already, can seem to find it...
    Thanks for any input...


    Hmmm... after proof reading it, dun seem to under my own question also...
    But I'll click the submit button & give it a try...

  2. #2

    Default

    most fixed maximum aperture zoom lens have lens barrels that dont extend/retract when the focal length is changed.

    physical length of the lens affects its effective aperture..

    can anyone further elaborate?

  3. #3

    Default

    Quote Originally Posted by AReality
    Fixed vs Variable maximum aperature

    Eg. 70-200 F2.8 or F4 vs 100-400 F4-5.6

    Is there any difference between a fixed maximum aperature lens and a variable maximum aperature lens? Without taking the quality of the glasses into account, or the focal length...

    I know the advantage of the former is allowing more light in at the longer end of the focal length.

    Searched for this topic quite long already, can seem to find it...
    Thanks for any input...


    Hmmm... after proof reading it, dun seem to under my own question also...
    But I'll click the submit button & give it a try...
    The big difference is the price! Haha...ok,besides the prices,theres alot of advantages with the fixed aperture.Cos u can use f/2.8 while u zoom into 200mm.(Faster shutter speed.)
    But the other lens,when u zoomed to the max,ur aperture becomes f/5.6.Which means u have to use a slower shutter speed and that may results in unwanted results.Especially in low lightings condition.

  4. #4
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    Default

    Quote Originally Posted by AReality
    Fixed vs Variable maximum aperature

    Eg. 70-200 F2.8 or F4 vs 100-400 F4-5.6

    Is there any difference between a fixed maximum aperature lens and a variable maximum aperature lens? Without taking the quality of the glasses into account, or the focal length...

    I know the advantage of the former is allowing more light in at the longer end of the focal length.

    Searched for this topic quite long already, can seem to find it...
    Thanks for any input...


    Hmmm... after proof reading it, dun seem to under my own question also...
    But I'll click the submit button & give it a try...
    Yep, don't understand you either. Need to be a little more precise about what you are looking for in a lens. You talking about optical quality, functionality, practicality or what ?

    Cheers,

  5. #5

    Default

    Due to unforseen circumstances, I NEED to upgrade a lens.

    Thinking of getting a F4 wide angle lens, or a F2.8-4 wide angle lens.

    So I just wanna know if the F4 or the F2.8-4 is a better choice.

    Thanks.

  6. #6

    Default

    Quote Originally Posted by AReality
    Due to unforseen circumstances, I NEED to upgrade a lens.

    Thinking of getting a F4 wide angle lens, or a F2.8-4 wide angle lens.

    So I just wanna know if the F4 or the F2.8-4 is a better choice.

    Thanks.
    If its a wide angle prime, most likely its at least a 2.8(at least for canon, I think)
    If u'r looking for a wide angle zoom, eg 20-35, the 1st party(canon,nikon,minolta,leica,etc) solutions will be expensive, if they make it at all.

  7. #7

    Default

    The only concrete thing you can infer just by looking at f2.8-4 vs f4 constant is that you will get double the shutter speed for the same exposure at the wide setting.

  8. #8
    Member
    Join Date
    Nov 2003
    Location
    Northeast
    Posts
    1,226

    Default

    Quote Originally Posted by AReality
    Due to unforseen circumstances, I NEED to upgrade a lens.

    Thinking of getting a F4 wide angle lens, or a F2.8-4 wide angle lens.

    So I just wanna know if the F4 or the F2.8-4 is a better choice.

    Thanks.
    If you are using the wideangle (zoom? prime?) lens for scenics, then its likely that you will be using it stopped down for maximum depth of field, in which case, a big maximum aperture is quite useless since you wouldn't be using it.

    If you foresee yourself using it in lowlight situations without a tripod then perhaps the F2.8-4 might be a better bet.

    Without knowing what sort of lenses (focal length, type, zoom? etc) and what you are using it for, you are only going to get generic answers.

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