fast glass

Discussion in 'Beyond the Basics' started by Mitch1640, Mar 22, 2009.

  1. Mitch1640

    Mitch1640 TPF Noob!

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    honestly how often do you owners of the 70-200 f2.8 actually use it wide open? or other fast glass, im just using the 70-200 as an example. people always talk about how important fast glass is, but i rarely hear of people using them wide open, we all know it isnt sharpest there anyways.

    i just sort of feel that fast glass is a little over emphasized.
     
  2. JerryPH

    JerryPH No longer a newbie, moving up!

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    Are you talking about the Canon or the Nikon 70-200?

    I have the Nikon version of the 70-200 and if I do not use it wide open, it is very close to wide open. About the only time it is not at F/2.8 is when doing portrait photography and I have 600 W/s of Profoto lights blasting the subject. Then it is up around F/11-F/16 @ 1/250th.
     
  3. tsaraleksi

    tsaraleksi TPF Noob!

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    I shoot with my 2.8 lenses wide open a lot of the time, really any time that I'm in bad light. Unless I particularly need a lot of depth (groups or something) I will go ahead and open the lenses up, because on the Canon Ls (and their counterpart Nikons) the quality wide-open is usually really good, to the point that I'd rather do that than up the ISO.

    Like Jerry the main time that I stop way down with the 70-200 is when doing portraits. I'm much more likely to stop down a shorter lens, actually.
     
  4. rufus5150

    rufus5150 TPF Noob!

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    By and large, an f/2.8 lens will look sharper at f/4 than an f/4 lens. That, to me at least, is my primary motivation going fast, but it's nice to have the option to shoot wide open (frankly, the bokeh at my 50mm at f/1.4-1.8 is silky, silky smooth).
     
  5. JerryPH

    JerryPH No longer a newbie, moving up!

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    I would have to agree. All lenses that I know of are not at their sharpest at the widest aperture. Stop down 1-2 stops and big things start to happen in the sharpness department.

    For sure... but I like the bokeh of fast glass that is above 50mm. Way nicer bokeh at 200mm and F/2.8. Compared to 50mm F/1.4 which would still fall under the cream machine of all lenses, the 85mm F/1.4 (not counting a Nottelux F/1.0... lol).

    The first time I played with my 70-200 it was at F/4 and "creamier" than when compared to the F/1.8 of the 50mm. That is to be expected, though as that is how bokeh works.

    A couple examples...

    F/4 @ 95mm on the 70-200 lens:
    [​IMG]

    50mm @ F/1.8 on the 50mm Nikon "plastic fantastic":
    [​IMG]

    85mm @ F/1.4 on the 85mm Nikkor "cream machine":
    [​IMG]
     
  6. Montana

    Montana TPF Noob!

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    Fast glass also has "side benefits". Like a brighter viewfinder and depending on the body/lens, faster autofocus abilities.
     
  7. Phranquey

    Phranquey TPF Noob!

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    I shoot with mine wide open quite often. And, Montana is correct...the f/2.8's are usually the top end pieces of glass, which also yields better build quality, the better AF systems, better clarity glass, best glass coatings, etc.

    As far as "over emphasized", if you mean over rated, then no, they are not. They may be a little over priced, but the producers are going to make you pay for the best.
     
  8. elemental

    elemental TPF Noob!

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    Another "side benefit" is often better build quality, which can (apparently) make a big difference when you're using it day in and day out on critical projects.

    I use every lens I have wide open at least some of the time (though I don't have a 70-200 f/2.8, since I rarely shoot longer than 50mm).
     
  9. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

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    Also fast glass will generally take a teleconverter well also - my 70-200mm f2.8 gets used with a 1.4 teleconverter on a regular basis (And is then only an f4 lens). Even with a 2* teleconverter its only an f5.6 lens - still very usable (in good lighting when stopped down to f8 ;))

    My macro lenses are hardly ever used wide open and are often stopped down to f13 or smaller- but the f2.8 view through the viewfinder is most certainly needed on those lense to compose and focus shots - if you were to get smaller the view would be so dark as to be impossible to use (or at least requireing a bright external light source to facilitate focusing
     
  10. Battou

    Battou No longer a newbie, moving up!

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    There is the bulk of the emphasis to fast lenses. If you are toating around a 70-200 2.8L wile your buddy is toating around a 200mm 4.0L and you both take a shot at F/4 the difference in outcome is obvious. Wile you are shooting at the same aperture at the same shutter speed, you have your lens stopped down a touch wile your buddy is shooting wide open.
     
  11. JerryPH

    JerryPH No longer a newbie, moving up!

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    That is another way of saying exactly the same thing.
     
  12. Battou

    Battou No longer a newbie, moving up!

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    That was the point.

    I was not calling you out, just reiterating what you said before people go into a bokeh tangent because it was the reply the OP sought. ;)
     

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