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DOF with a Canon 50mm f1.8 on a 350D

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    dalowsons  1089 forum posts Australia
    6 Dec 2005 - 3:04 PM

    Advice needed please ... ! I am seriously considering buying the Canon 50mm f1.8 II lens, but I would be using it mainly for portraits, and my question is this:

    1. Compared to the Canon 350D kit lens (18-55mm) will the quality be significantly, if any better ?

    2. More importantly, I am aiming to improve the background blur on my outdoor portrait shots - would the 50mm lens make a worthwhile difference to the DOF compared to the 18-55mm ?

    Thanks for any help you can give !


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    6 Dec 2005 - 3:12 PM

    1. The 50mm is miles sharper than the 18-55mm.

    2. As the 50mm has a maximum aperture of f1.8, it can give much less DOF than the 18-55mm ever could.

    The two lenses are like chalk and cheese.

    dalowsons  1089 forum posts Australia
    6 Dec 2005 - 3:19 PM

    Thank you, that has helped clarify what I suspected !


    fez  10262 forum posts
    6 Dec 2005 - 9:32 PM

    how sharp is it when you want a good closeup and a relatively wide dof?

    mipettin  10884 forum posts Scotland2 Constructive Critique Points
    7 Dec 2005 - 1:17 AM

    Fez the 50mm f/1.8 is so sharp for close ups at f/4 that you may not want to use USM. If you stop down to f/8 - i.e. want your subjects ears to be sharp as well as the tip of their nose it is razor sharp. When use at wider apertures then DOF becomes very thin when you are close to your subject. There are free utilities on the web to calculate DOF - think one is called DOFMaster. Some previous posters have complained about focus - but when shooting nearly wide open for close ups - DOF can be a matter of several cm and the fault is with the person holding the camera not the equipment. Hope this helps, Martin

    malum e2 Member 10622 forum postsmalum vcard United Kingdom1 Constructive Critique Points
    9 Dec 2005 - 6:17 AM

    It's as sharp as you like wide open

    For shallow DOF outside I'd go for something with a long focal length. The 70-200 F4L gives a very nice dof at the long end.

    strawman  1022006 forum posts United Kingdom16 Constructive Critique Points
    9 Dec 2005 - 7:10 AM

    Actualy, its contrast is not so good wide open, but by f2.8 its as good as you would want. It is better than the kit lens.

    exclusive  9579 forum posts United Kingdom
    10 Dec 2005 - 8:09 AM

    2.8 is a minium to use with this lens, at f1.8 and f2 it isn't very sharp at all, but is a very good lens and on holidays do9esn't come off my 35m SLR

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