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  1. #1
    RichardTaylor is offline dPS +1000 Club
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    Default Lenses #6 - Fast lenses

    Lenses #6 - Fast Lenses

    Fast lenses are those with wide maximum apertures.
    F2.8 for a zoom lens is fast.
    F2 or faster for lenses from 24mm to 135mm is fast.
    F2 for a 200mm lens is very fast and F2.8 is fast.
    F2.8 for 300 or 400mm is very fast.

    Disadvantages
    They can be very expensive.
    They can be big & heavy, especially the long telephotos however some of the shorter primes are very small and light.

    Advantages
    Because of the fast apertures they are great for low light shooting and not just indoors.

    (1a) You can even shoot urban scenes hand held, as in this example.

    Sydney Opera House.
    Camera Canon EOS 5D
    Exposure 0.04 sec (1/25)
    Aperture f/2.0
    Focal Length 35 mm
    ISO Speed 3200
    Exposure Bias 0 EV

    (1b) Or indoors without a flash or a tripod.

    Uploaded for a thread
    Camera Canon EOS 40D
    Exposure 0.005 sec (1/200)
    Aperture f/2.0
    Focal Length 135 mm
    ISO Speed 3200
    Exposure Bias 0 EV
    Flash Off, Did not fire

    (2) They are capable of achieving very shallow depth of field (DOF), great for isolating subjects from the background or for creative purposes.

    (2a) for creative purposes

    Bluebell & tulip.
    Camera Canon EOS 40D
    Exposure 0.001 sec (1/800)
    Aperture f/2.0
    Focal Length 135 mm
    ISO Speed 100
    Exposure Bias 0 EV

    (2b) Subject isolation (this case a busy street scene).

    The model. (sideview)
    Camera Canon EOS 40D
    Exposure 0.001 sec (1/1600)
    Aperture f/2.0
    Focal Length 135 mm
    ISO Speed 100
    Exposure Bias -2/3 EV
    Flash Off, Did not fire

    ============================

    Lenses #1 - Introduction to DSLR lenses.
    Lenses #1 - Introduction to DSLR lenses.

    Zooms & primes.
    For a good introduction to zoom and prime lenses see this post (on this site).
    http://www.digital-photography-schoo...which-are-best

    (2) "Standard" zooms -
    Lenses #2 - Standard lenses

    (3) Superzooms:
    Lenses #3 - Superzooms.

    (5) Wide angle.
    Lenses #4 - Wide angle.

    (6) Telephoto zooms
    Lenses #5 - Telephoto

    (7) Fast lenses - This post
    ----------------------------

    Thanks for looking.
    Feel free to ask questions and feedback would be appreciated.

    Richard

  2. #2
    STB's Avatar
    STB
    STB is offline What's your story?
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    Default

    Thank you so much for this info, Richard. Short and clear and filled with just what I needed. The photo examples nailed it for me.
    Susan Taylor Brown, learning, always learning
    Nikon D7000, 18-105mm, 70-300mm, 35mm f/1.8, 50mm f/1.8, 105mm Macro f/2.8
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  3. #3
    RichardTaylor is offline dPS +1000 Club
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    Default

    Thanks.
    Glad to help out.

  4. #4
    STB's Avatar
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    I actually just read through your entire series and it helped settle things in my mind as I make some initial purchase decisions. Have bookmarked the series for future reference and gone in search of more educational posts by you. Love the learning and the sharing going on here at DPS.
    Susan Taylor Brown, learning, always learning
    Nikon D7000, 18-105mm, 70-300mm, 35mm f/1.8, 50mm f/1.8, 105mm Macro f/2.8
    Flickr | Facebook | Tumblr
    Website where all my creative lives converge
    My blog I found the courage to create

  5. #5
    bluebendphoto is offline I'm new here!
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    Default Disagree

    I disagree that fast lenses are super expensive.

    Canon has a 28 1.8, a 50 1.4 and an 85 1.8... all for less than $500. You don't necessarily have to jump into L lenses to get fast lenses.

  6. #6
    RichardTaylor is offline dPS +1000 Club
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    @ bluebendphoto

    The post was not read correctly or it was failed to be comprehended. See the words "can be"

    I do own the 85mnm f1.8

    Also I agree about L lenses especially if you are not a Canon shooter.

    Richard
    -----------------------------------------------------------
    Quote Originally Posted by RichardTaylor View Post
    Lenses #6 - Fast Lenses
    .
    .

    Disadvantages
    They can be very expensive.
    They can be big & heavy, especially the long telephotos however some of the shorter primes are very small and light.
    .
    .
    .
    Richard
    Last edited by RichardTaylor; 06-17-2012 at 03:06 AM.

  7. #7
    ccting is offline Banned
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    Dear Richard,

    I read somewhere, and it is stated that 24mm f/1.4G is the fastest lens for Nikon lenses. But when I look at the first post, it looks that the longer focal length the faster @ same aperture. I am confuse...

    a) is 24 f/1.4 faster than 200 f/1.4? (assume that they exist).

    b) Why "fast" lens. Issit because of the capability to have high shutter speed @ widest aperture while retaining the same DOF? IMO, the ability to use higher shutter speed to maintain the same DOF is faster lens for same exposure with changing aperture. That means, 200mm lens need higher f-number to get the same DOF than 24mm lens. In other words, 24mm @ f/1.4 can retain more DOF than 200mm f/1.4 (assume it exists) @ same f-number, then 24mm f/1.4 is faster than 200mm. Faster refers to shutter speed (but why DOF?)

    So my friendly opinion is


    F2 or faster for lenses from 24mm - very fast
    F2 for a 200mm lens is fast (not very fast, but just fast, slower than 24mm)

    * I may misunderstood what you mean..
    Ty.
    Last edited by ccting; 06-04-2012 at 12:49 AM.

  8. #8
    RichardTaylor is offline dPS +1000 Club
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    Fast refers to how much light the lens can gather (aperture).

    DOF is a function of aperture, focal length and subject distance.

    It's only guide and everything is relative. However the longer focal lengths you go the smaller aperture you need to be considered fast..

    All F1.4 lenses are fast and those of very long focal lengths could be considered to be very fast..
    Last edited by RichardTaylor; 06-04-2012 at 02:13 AM.

  9. #9
    BhandariAditya is offline I'm new here!
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    Default

    Quote Originally Posted by RichardTaylor View Post
    Lenses #6 - Fast Lenses

    Fast lenses are those with wide maximum apertures.
    F2.8 for a zoom lens is fast.
    F2 or faster for lenses from 24mm to 135mm is fast.
    F2 for a 200mm lens is very fast and F2.8 is fast.
    F2.8 for 300 or 400mm is very fast.

    Disadvantages
    They can be very expensive.
    They can be big & heavy, especially the long telephotos however some of the shorter primes are very small and light.

    Advantages
    Because of the fast apertures they are great for low light shooting and not just indoors.

    (1a) You can even shoot urban scenes hand held, as in this example.

    Sydney Opera House.
    Camera Canon EOS 5D
    Exposure 0.04 sec (1/25)
    Aperture f/2.0
    Focal Length 35 mm
    ISO Speed 3200
    Exposure Bias 0 EV

    (1b) Or indoors without a flash or a tripod.

    Uploaded for a thread
    Camera Canon EOS 40D
    Exposure 0.005 sec (1/200)
    Aperture f/2.0
    Focal Length 135 mm
    ISO Speed 3200
    Exposure Bias 0 EV
    Flash Off, Did not fire

    (2) They are capable of achieving very shallow depth of field (DOF), great for isolating subjects from the background or for creative purposes.

    (2a) for creative purposes

    Bluebell & tulip.
    Camera Canon EOS 40D
    Exposure 0.001 sec (1/800)
    Aperture f/2.0
    Focal Length 135 mm
    ISO Speed 100
    Exposure Bias 0 EV

    (2b) Subject isolation (this case a busy street scene).

    The model. (sideview)
    Camera Canon EOS 40D
    Exposure 0.001 sec (1/1600)
    Aperture f/2.0
    Focal Length 135 mm
    ISO Speed 100
    Exposure Bias -2/3 EV
    Flash Off, Did not fire

    ============================

    Lenses #1 - Introduction to DSLR lenses.
    Lenses #1 - Introduction to DSLR lenses.

    Zooms & primes.
    For a good introduction to zoom and prime lenses see this post (on this site).
    http://www.digital-photography-schoo...which-are-best

    (2) "Standard" zooms -
    Lenses #2 - Standard lenses

    (3) Superzooms:
    Lenses #3 - Superzooms.

    (5) Wide angle.
    Lenses #4 - Wide angle.

    (6) Telephoto zooms
    Lenses #5 - Telephoto

    (7) Fast lenses - This post
    ----------------------------

    Thanks for looking.
    Feel free to ask questions and feedback would be appreciated.

    Richard
    Hi Richard

    Thanks... your inputs really settle lots of things... I have a Canon 60D...
    I am curios to ask would a 60D be able to produce the same effect for your picture "1a" with the same lens... and would you help share which lens you used precicely to get this picture...

    Thanks
    Aditya

  10. #10
    RichardTaylor is offline dPS +1000 Club
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    Default

    Yes it would. With the right lens.
    Pics 1 to 4 were shot with Canon primes.

    (1) Canon EF 35mm f/2 Lens

    (2-4) Canon EF 135mm f/2 L USM

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