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Thread: Why choose a f2.8 lens over f4?

  1. #41

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by Cowseye View Post
    Or simply leave quality of bokeh out of discussion because it varies with different lenses. I thought it started out to be a discussion betw. why F/2.8 over F/4?
    Quote Originally Posted by GSiGuy View Post
    yeah seems like a slight bit off the subject of the thread to do so... or perhaps a related corollary but only a small part of the whole
    this topic on bokeh will come up, especially when people start slinging "bokeh" all over the place while misinforming what it actually is.

  2. #42

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by gohjialong View Post
    Another thing is , if f2.8 is sharper at like f4 , then what is f4 sharpest at?

    If my situation would most likely be casual portraits on the streets or in restaurants, would 2.8 be a better choice given its ability to go for faster shutter speed at low lit areas?
    Depends on the lens. Different lenses have different sweet spots. Most lenses are at their sharpest between f/5.6-f/8, but this is variable.
    Alpha

  3. #43

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by Rashkae View Post
    Depends on the lens. Different lenses have different sweet spots. Most lenses are at their sharpest between f/5.6-f/8, but this is variable.
    I take landscape with my tamron f2.8. would it be better using 17-40 f4 L for landscapes? cos landscapes usually go for f8~f11 right? does this mean that my pictures will be sharper using the 17-40?

  4. #44
    Moderator rhino123's Avatar
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    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by gohjialong View Post
    I take landscape with my tamron f2.8. would it be better using 17-40 f4 L for landscapes? cos landscapes usually go for f8~f11 right? does this mean that my pictures will be sharper using the 17-40?
    Check out this site, it did a good comparism.

    http://www.the-digital-picture.com/R...mp=0&APIComp=5

  5. #45

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by rhino123 View Post
    Check out this site, it did a good comparism.

    http://www.the-digital-picture.com/R...mp=0&APIComp=5
    i must say im sorry but i havent learnt how to see those graphs. =(

  6. #46

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by gohjialong View Post
    I take landscape with my tamron f2.8. would it be better using 17-40 f4 L for landscapes? cos landscapes usually go for f8~f11 right? does this mean that my pictures will be sharper using the 17-40?
    Not necessarily. You'd need to read the lens reviews. They usually discuss performance at various focal lengths and apertures.
    Alpha

  7. #47
    Moderator rhino123's Avatar
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    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by gohjialong View Post
    i must say im sorry but i havent learnt how to see those graphs. =(
    It is not showing any graphs. It shows you the pics, you can judge by yourself the sharpness.

  8. #48

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by rhino123 View Post
    It is not showing any graphs. It shows you the pics, you can judge by yourself the sharpness.
    erm ok i see 17-40 sharper than 17-50 at f8 corner.

  9. #49

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by Rashkae View Post
    Not necessarily. You'd need to read the lens reviews. They usually discuss performance at various focal lengths and apertures.
    found this "Wide open center of the frame sharpness ranges from great on the wide end to good on the long end. Wide open corner sharpness is also relatively good, but as usual, the corners are not as sharp as the center. Stopping the 17-40 L down to f/5.6 brings along a nice improvement in sharpness. Common landscape apertures f/8 through f/11 look very good. " in the digital picture website.

    Thanks!

  10. #50
    Member Kenneth67C's Avatar
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    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by Rashkae View Post
    Correct, ZerocoolAstra understands it perfectly. Those sort of sweeping statements with no real link are a folly.
    Apologies for that post. I've deleted it.
    An artist who realizes there is a supreme force and works gladly as an apprentice under heaven.

  11. #51
    Moderator daredevil123's Avatar
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    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by Kenneth67C View Post
    Apologies for that post. I've deleted it.
    No big deal bro. why apologize?


  12. #52

    Default

    Quote Originally Posted by Kenneth67C

    Apologies for that post. I've deleted it.
    No need for apologies bro but respect to you for acknowledging that there was a misunderstanding. Not many people in this forum is able to do that.

  13. #53

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by GSiGuy View Post
    imho, for this discussion to have any meaning at all, you guys may have to come up with an agreement on what "better bokeh" means... (which by itself may be argued til death)...
    +1 to that, Better is very subjective.

    Basically, if TS need to shoot in low light condition, it is better to get the biggest aperture that Ts can afford.

  14. #54
    Moderator daredevil123's Avatar
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    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by lcheowl View Post
    +1 to that, Better is very subjective.

    Basically, if TS need to shoot in low light condition, it is better to get the biggest aperture that Ts can afford.
    Actually, the consensus is that the more gaussian the blur is, the better it is. For OOF light blobs, the round the more consistent, the better it is.

  15. #55

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by ZerocoolAstra View Post
    You may come to dislike the weight 'penalty' that the f/2.8 zoom lens forces you to incur, compared with the variable-aperture or smaller-aperture alternative
    With one weight 'penalty' len+ body to carry, it is OK for me... It is our mindset not to focus on the equipment but the surrounding to take sharp and good shoot that the public will look at your photos twice and find interesting... that is my challenge and I will achieve... my mindset

  16. #56

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by daredevil123 View Post
    Actually, the consensus is that the more gaussian the blur is, the better it is. For OOF light blobs, the round the more consistent, the better it is.
    Ahh, OOF light blobs. When I watch TV dramas, I like to look for them and even though I don't know what lens they use for the shoot, at least I know how many aperture blades it has (seems to be always 6).

  17. #57
    Senior Member ZerocoolAstra's Avatar
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    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by NikF601 View Post
    With one weight 'penalty' len+ body to carry, it is OK for me... It is our mindset not to focus on the equipment but the surrounding to take sharp and good shoot that the public will look at your photos twice and find interesting... that is my challenge and I will achieve... my mindset
    Good for you

    I would say the 2 main 'obstacles' to a large-aperture lens are bulk (weight/size) and cost. Otherwise they are generally the preferred choices, wouldn't you say so?
    Exploring! :)

  18. #58
    Senior Member ZerocoolAstra's Avatar
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    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by gohjialong View Post
    found this "Wide open center of the frame sharpness ranges from great on the wide end to good on the long end. Wide open corner sharpness is also relatively good, but as usual, the corners are not as sharp as the center. Stopping the 17-40 L down to f/5.6 brings along a nice improvement in sharpness. Common landscape apertures f/8 through f/11 look very good. " in the digital picture website.

    Thanks!
    There you go
    Exploring! :)

  19. #59
    Moderator rhino123's Avatar
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    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by ZerocoolAstra View Post
    Good for you

    I would say the 2 main 'obstacles' to a large-aperture lens are bulk (weight/size) and cost. Otherwise they are generally the preferred choices, wouldn't you say so?
    To me... the main deciding factor is the cost. Weigh wise... unless the lens weighed more than 2kg, it is still okay... afterall, I shoot with my monopod or tripod most of the time and I can handle some weigh for prolonged periods of time.

  20. #60

    Default Re: Why choose a f2.8 lens over f4?

    Quote Originally Posted by daredevil123 View Post
    Actually, the consensus is that the more gaussian the blur is, the better it is. For OOF light blobs, the round the more consistent, the better it is.
    well, if that can be agreed upon as the foundation of "better bokeh" then i think you will have a more meaningful discussion on which is better, prime v zoom, rounded v straight blades, # of blades, aperture width, etc...

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