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  1. #1
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    Another plus for Sony - AF

    There is a lot of talk about the benefit of built in IS. But what about AF. Best example is the Tamron 17-50. With Canon you have to decide between the Tamron 17-50 for $430 vs the Canon 17-55 for about a grand. Besides the Canon name and maybe a little bit better sharpness wide open, the Canon gets you IS AND a USM focusing motor. I used a Canon mount Tamron 17-50 yesterday and I thought a bee was stuck in the lens. With Sony that cheap Tamron has both IS and a good (not USM good, but close) focusing motor.

    Just thought I'd add that as some fuel for the fire. I was pretty sold on picking that Tamron up for my 40D until I tried it yesterday. Bloody loud, and apparently struggles to focus a bit in low light.
    Jason Hamilton
    Selective Frame

    EOS 5D - Canon EF 24-85mm f/3.5-4.5 USM, EF 35 f/2, EF 50mm f/1.8 Mk II, EF 70-210 f/3.5-4.5 USM, EF 85mm f/1.8 USM, EF 100mm f/2.8 Macro, Helios 44-2 58mm f/2 (with EOS adapter), 430EX, Canon S90
    Nikon FE - Nikkor 35mm f/2 AI'd, Nikkor 50mm f/1.8 AI, Nikkor 105mm f/2.5 AI, F to EF adapter, 2xVivitar 285, other lighting stuff
    Mamiya C220 - 80mm f/2.8

    Gear List flickr

  2. #2
    Join Date
    Jun 2008
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    One of the benefits of the screw drive I suppose.
    flickr

    Canon 7D - 5D | 550EX - 430EX II - (2) PW FlexTT5 | 24-105 f4L | 70-200 f2.8L IS | 100 f2.8L IS | 50 f1.8 II

  3. #3
    Join Date
    Dec 2006
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    Quote Originally Posted by laydros View Post
    There is a lot of talk about the benefit of built in IS. But what about AF. Best example is the Tamron 17-50. With Canon you have to decide between the Tamron 17-50 for $430 vs the Canon 17-55 for about a grand. Besides the Canon name and maybe a little bit better sharpness wide open, the Canon gets you IS AND a USM focusing motor. I used a Canon mount Tamron 17-50 yesterday and I thought a bee was stuck in the lens. With Sony that cheap Tamron has both IS and a good (not USM good, but close) focusing motor.

    Just thought I'd add that as some fuel for the fire. I was pretty sold on picking that Tamron up for my 40D until I tried it yesterday. Bloody loud, and apparently struggles to focus a bit in low light.
    jason, you only tell half the story. the canon 17-55 is far superior in AF speed, far superior in AF accuracy, far superior in build quality, far superior in colour rendition, far superior IS and all round far superior in optical quality.

    all tamrons struggle to focus, regardless of the system they are used on. the AF is slow, noisy, innacurate and half assed in comparison to quality OEM product.
    D800e l V3 l AW1 l 16-35 l 35 l 50 l 85 l 105 l EM1 l 7.5 l 12-40 l 14 l 17 l 25 l 45 l 60 l 75
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  4. #4
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    Jun 2008
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    You get what you pay for
    flickr

    Canon 7D - 5D | 550EX - 430EX II - (2) PW FlexTT5 | 24-105 f4L | 70-200 f2.8L IS | 100 f2.8L IS | 50 f1.8 II

  5. #5
    Join Date
    Feb 2006
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    "Far superior" might be better reserved for a comparison between Phoenix lenses and the upper echelon.

    I accuse you of "just mixing the pot", Rooz, for no apparent reason. Rather silly, if you ask me ... unless, you are stuffing people's pockets with money, to make up the difference.

    Have a happy, I guess.

    "Far superior" Yeah, right. hah! (shaking head in disbelief)
    Last edited by DonSchap; 04-25-2009 at 06:36 PM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr & Sdi

  6. #6
    Join Date
    Dec 2006
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    Quote Originally Posted by dr4gon View Post
    You get what you pay for
    yes, you do.

    Quote Originally Posted by DonSchap View Post
    "Far superior" might be better reserved for a comparison between Phoenix lenses and the upper echelon.

    "Far superior" Yeah, right. hah! (shaking head in disbelief)
    the tammie can produce very good MTF sharpness and very nice bokeh aswell, but its AF is average at best which is what i really was "focussed on" in my OP. when it comes to AF, its the difference between a shot in focus and a shot out of focus...so yeah...i say far superior cos wit hthe 17-55 you have a far greater chance of the shot being in focus.

    jason's OP did not mention value for money, so i;m just putting it in context.
    D800e l V3 l AW1 l 16-35 l 35 l 50 l 85 l 105 l EM1 l 7.5 l 12-40 l 14 l 17 l 25 l 45 l 60 l 75
    flickr

  7. #7
    Join Date
    Oct 2008
    Location
    Raleigh, NC, USA
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    My point was that the Sony screw drive AF, while not as good as USM, is a lot better than the little buzzing motor Tamron puts in their lens. Yes a Canon 17-55IS USM is going to focus better than the Tamron on a Sony with screw drive AF. But in my experience with a decent USM lens, several Sony/Minolta screw drive lenses, and a handful of Canon mount micro motor lenses, the difference in screw-drive AF and USM isn't nearly as big as the difference in micro motor and screw drive. I consider screw drive "good enough," USM great, and micro motor obnoxious.

    I don't think build quality is a massive difference either. The Tamron has ok build quality, and the 17-55IS has good build quality, but it still isn't an "L" lens. And considering the better warranty and included hood....

    However, you are right that the Canon has IS, and is better wide open. But I disagree that most of the mentioned characteristics are "far superior."
    Jason Hamilton
    Selective Frame

    EOS 5D - Canon EF 24-85mm f/3.5-4.5 USM, EF 35 f/2, EF 50mm f/1.8 Mk II, EF 70-210 f/3.5-4.5 USM, EF 85mm f/1.8 USM, EF 100mm f/2.8 Macro, Helios 44-2 58mm f/2 (with EOS adapter), 430EX, Canon S90
    Nikon FE - Nikkor 35mm f/2 AI'd, Nikkor 50mm f/1.8 AI, Nikkor 105mm f/2.5 AI, F to EF adapter, 2xVivitar 285, other lighting stuff
    Mamiya C220 - 80mm f/2.8

    Gear List flickr

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