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Thread: 70-300 + EC-14 - focusing in a cluttered scene

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    Default 70-300 + EC-14 - focusing in a cluttered scene

    I set up a demo of the 70-300 lens's fast focusing ability (even with the EC-14 included) in a cluttered environment, like the woods. I did this because some of my friends had read that the "hunting" of the lens was miserable. Well, I agree that it can be bothersome, but I think it can be tamed and you can get used to controlling it, as shown in this little demo. See it here:

    http://www.rahsoft.net/spotfocus/index.htm

    Update:
    I have set up a 2nd album demonstrating the focus capabilities of this lens combination:

    http://www.rahsoft.net/spotfocus2/index.htm
    Last edited by RAH; 06-04-2010 at 01:59 PM.
    Rich
    Olympus E-M10; Panasonic GM5
    m4/3 lenses: Oly 75-300; Oly 14-42 f3.5-5.6 II R; Oly 17 f1.8; Oly 40-150 f4.0-5.6 R; Oly WCON-P01 adapter; Rokinon f7.5 fisheye; Sigma 19 f2.8; Pan 20 f1.7; Pan 12-35 f2.8; Pan 12-32

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    Default Re: 70-300 + EC-14 - focusing in a cluttered scene

    Thanks very much for this, an easy read and good demonstration of the EC14 & 50-200mm lens combo.
    Adam
    piXelatedEmpire.com | Bird & Wildlife Photography
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    Default Re: 70-300 + EC-14 - focusing in a cluttered scene

    Quote Originally Posted by piXelatedEmpire View Post
    Thanks very much for this, an easy read and good demonstration of the EC14 & 50-200mm lens combo.
    ah but it wasn't even that lens combination........

    Overall Rich, whilst I agree with all you say in the article, I have to take up the issue of directly relating lens and AF in the way you imply.

    The camera does the AF

    There are general attributes of a lens that contribute to AF issues, and there are symptoms that can be associated with one or more of these attributes.

    Then there are camera AF aspects

    Finally there are subject/task elements - as exemplified with your small bird in a big tree at distance.

    Lens speed and contrast capabilities contribute to the overall performance of any AF system. Slow and cheap(er) being worst.

    Macro, or close focusing lenses, tend to have lower gearing and longer focus cycles - these will inevitably exhibit the most obvious 'hunting' symptoms when combined with a subject that includes many focus distance possibilities - because of the time elements in each lock. Some really fast lenses with SWD motors actually hunt more.

    The ability to relate the camera AF point, or points, to the subject can have a huge impact on the perceived performance of any lens set up - get to within 4 feet of the same bird in the same tree and the bird will fully cover the active AF point on a 520 - but with the dof issues at that magnification you may want to focus specifically on the eye

    Back to the combination's here - the 70-300 and 50-200 'suffer' from having long AF cycles because they have relatively good close focusing capabilities (and therefore long focus cycles) - the SWD version of the 50-200 does things faster - and the 70-300 is a lot slower and slightly less contrasty (but better than a lot of similar spec glass). The 520 has a one size fits all AF point sensitivity setting. So take a well lit, suitably sized target, and the AF performance will be excellent - but of course life's not like that is it!
    E-P1/E3/E30/E510/E400/7-14/12-60/14-42/14-54/S 30 1.4/35/35-100/40-150/50/50-200/EC14/EC20/EX25/2xFL50R/FL36R/RF11/SHV-1/AC-1/AC-2

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    Default Re: 70-300 + EC-14 - focusing in a cluttered scene

    Glad you like my article, Adam, although note that, as Photo_owl says, it is about the 70-300 plus EC-14 , not the 50-200.

    Interesting observations about the additional focus issues, Photo_owl. Speaking of owls, I am preparing a few additional pictures for my article, one being a Great Grey Owl, taken in pretty murky light, which I think is a pretty good demo of taming the hunting aspects of the 70-300 even when there is very poor contrast.
    Rich
    Olympus E-M10; Panasonic GM5
    m4/3 lenses: Oly 75-300; Oly 14-42 f3.5-5.6 II R; Oly 17 f1.8; Oly 40-150 f4.0-5.6 R; Oly WCON-P01 adapter; Rokinon f7.5 fisheye; Sigma 19 f2.8; Pan 20 f1.7; Pan 12-35 f2.8; Pan 12-32

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    Default Re: 70-300 + EC-14 - focusing in a cluttered scene

    As promised, I have set up a 2nd album of images showing some pretty good focus results in really cluttered and/or low-contrast environments. It is here:

    http://www.rahsoft.net/spotfocus2/index.htm

    Enjoy!
    Rich
    Olympus E-M10; Panasonic GM5
    m4/3 lenses: Oly 75-300; Oly 14-42 f3.5-5.6 II R; Oly 17 f1.8; Oly 40-150 f4.0-5.6 R; Oly WCON-P01 adapter; Rokinon f7.5 fisheye; Sigma 19 f2.8; Pan 20 f1.7; Pan 12-35 f2.8; Pan 12-32

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    Default Re: 70-300 + EC-14 - focusing in a cluttered scene

    Quote Originally Posted by RAH View Post
    I set up a demo of the 70-300 lens's fast focusing ability (even with the EC-14 included) in a cluttered environment, like the woods. I did this because some of my friends had read that the "hunting" of the lens was miserable. Well, I agree that it can be bothersome, but I think it can be tamed and you can get used to controlling it, as shown in this little demo. See it here:

    http://www.rahsoft.net/spotfocus/index.htm

    Update:
    I have set up a 2nd album demonstrating the focus capabilities of this lens combination:

    http://www.rahsoft.net/spotfocus2/index.htm


    Such a very amazing link!
    Thanks you for the post.

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    Default Re: 70-300 + EC-14 - focusing in a cluttered scene

    Thanks, Nancy! I'm glad to hear you found it helpful.
    Rich
    Olympus E-M10; Panasonic GM5
    m4/3 lenses: Oly 75-300; Oly 14-42 f3.5-5.6 II R; Oly 17 f1.8; Oly 40-150 f4.0-5.6 R; Oly WCON-P01 adapter; Rokinon f7.5 fisheye; Sigma 19 f2.8; Pan 20 f1.7; Pan 12-35 f2.8; Pan 12-32

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    Default Re: 70-300 + EC-14 - focusing in a cluttered scene

    I am not that expert to comment on this as everything almost I realized has already been posted here. But one thing is sure that the demo link posted here is wonderful and I got to learn many things from it. The second album regarding the focus capabilities of lens combo is easy to understand and I found it wonderful for my work purpose.

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    Default Re: 70-300 + EC-14 - focusing in a cluttered scene

    Thanks! I'm glad I added that second album, which I think is somewhat more instructive and clear than the first.
    Rich
    Olympus E-M10; Panasonic GM5
    m4/3 lenses: Oly 75-300; Oly 14-42 f3.5-5.6 II R; Oly 17 f1.8; Oly 40-150 f4.0-5.6 R; Oly WCON-P01 adapter; Rokinon f7.5 fisheye; Sigma 19 f2.8; Pan 20 f1.7; Pan 12-35 f2.8; Pan 12-32

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