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Lens question...

  • 13-09-2006 8:37pm
    #1
    Dr.Louis
    Closed Accounts Posts: 236 ✭✭


    Hey all... Thinking about buying an extra lens when I buy my camera soon!

    Is the sigma AF 70-300 F4-5.6 Macro, a good one?

    Also there are two different ones... One with APO and one without... can you explain the difference please??

    Thanks!


Comments

  • #2
    Fajitas!
    Registered Users, Registered Users 2 Posts: 16,624 ✭✭✭✭Fajitas!


    Tis a grand lens for the money, you could buy better, but not without spending a lot more :)


  • #3
    Western_sean
    Registered Users, Registered Users 2 Posts: 98 ✭✭Western_sean


    I have one of these and I really like it - for the money I think it's super value, especially for those of us who prefer not to "zoom with their feet".

    As for the APO thing.....

    From Sigma's website
    SIGMA's APO zoom lenses minimize color aberration. As the refractive index of glass depends on the wavelength of light, color aberration occurs when different colors form images at different points. This problem often occurs with telephoto lenses, but the Special Low-Dispersion (SLD) glass and

    Extraordinary Low Dispersion (ELD) used in SIGMA's APO lenses helps to compensate for color aberration, thereby allowing them to produce of sharp images.

    Hope that helps
    Sean


  • #4
    mdebets
    Registered Users, Registered Users 2 Posts: 1,747 ✭✭✭mdebets


    I have one as well and it's quite ok. I have however use higher ISOs in the typical overcast Irish weather


  • #5
    Dr.Louis
    Closed Accounts Posts: 236 ✭✭Dr.Louis


    cool thanks a mill :) think i'll go for it :)


  • #6
    DotOrg
    Registered Users, Registered Users 2 Posts: 1,557 ✭✭✭DotOrg


    Dr.Louis wrote:
    Is the sigma AF 70-300 F4-5.6 Macro, a good one?
    it's not really a macro lens, should you be thinking about doing lots of close ups with it

    aside from that it's a grand lens for the price. doesn't have a very good aperture for low light shooting or for isolating the subject with shallow depth of field but otherwise will do the job once you don't expect too much from it in terms of autofocus speed etc


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  • #7
    Valentia
    Closed Accounts Posts: 3,764 ✭✭✭Valentia


    This is a lens that has grown on me. The macro is only 1:2 and is impossible to use handheld @300mm most of the time. It produces nice softish photos and is great value.


  • #8
    jlang
    Registered Users, Registered Users 2 Posts: 1,496 ✭✭✭jlang


    It is generally advised that the APO version is well worth the small premium on the price (in answer to that specific part of the OP's question).


  • #9
    mtracey
    Closed Accounts Posts: 264 ✭✭mtracey


    Its a fine lens. get the APO II version, one with the red stripe and not the gold.

    Can someone explain why its not macro ? I've been using it successfully as a macro lens and it fits the bill for my purposes.


  • #10
    Valentia
    Closed Accounts Posts: 3,764 ✭✭✭Valentia


    mtracey wrote:
    Can someone explain why its not macro ? I've been using it successfully as a macro lens and it fits the bill for my purposes.

    It is macro but not 1:1 ratio. It is 1:2 ratio. 1:1 will double the size of the subject in the frame.....I think.


  • #11
    Zillah
    Registered Users, Registered Users 2 Posts: 17,371 ✭✭✭✭Zillah


    Valentia wrote:
    It is macro but not 1:1 ratio. It is 1:2 ratio. 1:1 will double the size of the subject in the frame.....I think.

    Uh...

    I'm fairly sure that 1:1 means that what you're shooting will be recreated life size in the image. Print it, put it down beside it and it will look the exact same. 1:2 means it'll be half as big.

    I could be wrong, but thats always a slight possibility.


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  • #12
    melekalikimaka
    Moderators, Education Moderators, Music Moderators Posts: 10,686 Mod ✭✭✭✭melekalikimaka


    1:1, or 100% life-size, without requiring any other equipment. 1:2 would be 50% life-size, 1.5:1 would be 150% life-size, etc.


  • #13
    Valentia
    Closed Accounts Posts: 3,764 ✭✭✭Valentia


    Zillah wrote:
    Uh...

    I'm fairly sure that 1:1 means that what you're shooting will be recreated life size in the image. Print it, put it down beside it and it will look the exact same. 1:2 means it'll be half as big.

    I could be wrong, but thats always a slight possibility.

    Yes I know. But what I said doesn't contradict that......I think :p

    Regarding printing if you print a 6x4 and a 20x16 the size of the subject will be different so I'm not sure how exactly to figure out this life size thing. Lifesize on the sensor? Maybe :confused:


  • #14
    mtracey
    Closed Accounts Posts: 264 ✭✭mtracey


    1:1 will mean that its the same time on the sensor as in real life.

    You're correct that the sigma is 1:2. Not sure how it works with digital and a crop factor of 1.5, I'm sure that it'll make it closer to 1:1


  • #15
    Zillah
    Registered Users, Registered Users 2 Posts: 17,371 ✭✭✭✭Zillah


    Valentia wrote:
    Yes I know. But what I said doesn't contradict that......I think :p

    You said something about 1:1 doubling its size... Nevermind, I think we're clear now.
    Regarding printing if you print a 6x4 and a 20x16 the size of the subject will be different so I'm not sure how exactly to figure out this life size thing. Lifesize on the sensor? Maybe :confused:

    Hmm. True. At first I was thinking if you just took the raw image and printed but that depends on the resolution of your camera and all.

    So yeah, sensor it is :)


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