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  1. #1
    Senior Member

    Just got a sigma 105 lens

    So i just picked up my first macro lens, a Sigma 105mm F2.8 EX DG so any one offer any help regarding lens and camera settings,


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  2. #2
    Happy to be Canadian
    Super Mod
    Marcel's Avatar

    Re: Just got a sigma 105 lens

    Use manual focus to get in the wanted range. After that, leave the focus ring alone and S L O W L Y move back and forth to get the focus exactly where you want it to be.
    Thanks/Like Blacktop, aporodagon Thanks/liked this post
     
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  3. #3
    Senior Member
    hark's Avatar

    Re: Just got a sigma 105 lens

    Quote Originally Posted by Marcel View Post
    Use manual focus to get in the wanted range. After that, leave the focus ring alone and S L O W L Y move back and forth to get the focus exactly where you want it to be.
    ^^^This or get a focus rail to mount on a tripod. Keep in mind that when your lens is so close to the subject, your DOF is extremely shallow. That means your aperture might be f/16 or around there. If you use f/5.6, not much will be sharp because the depth of field is too shallow.
    Thanks/Like Big E Thanks/liked this post
     
    Cindy
    Flickr
    and
    My 2017 Thread
    Where the Spirit does not work with the hand, there is no art
    -- Leonardo da Vinci

    Nikon 14mm f/2.8; Nikon 16mm f/2.8 fisheye; Nikon 85mm f/1.8G; Nikon 105 f/2.8G micro VR; Nikon 180mm f/2.8; Nikon 300mm f/4 AF-S
    Nikon 18-35mm f/3.5-4.5G; Sigma 24-70mm f/2.8; Nikon 70-200mm f/2.8 VRII; Nikon 70-300mm f/4.5-5.6G VR


  4. #4
    Senior Member

    Re: Just got a sigma 105 lens

    Thanks folks, i notice the F stop showing on the camera will not be more that F3 when the lens is F2.8 is this normal for a macro lens?

  5. #5
    Senior Member

    Re: Just got a sigma 105 lens

    Quote Originally Posted by bikeit View Post
    Thanks folks, i notice the F stop showing on the camera will not be more that F3 when the lens is F2.8 is this normal for a macro lens?
    When you say 'more', I assume you mean bigger opening, a lower number? It's stuck at 3 and you expect to see 2.8? If thats what you mean, yes that is normal. Focus on something far away and you will get down to 2.8 if you need it. You will never need it for a closeup. I forget what this lens property is called, but its normal behavior for this lens.
    I must have a really good camera.

  6. #6
    Senior Member

    Re: Just got a sigma 105 lens

    yea, thanks for all your help folks, looking forward to using this lens.

  7. #7
    Senior Member
    hark's Avatar

    Re: Just got a sigma 105 lens

    Quote Originally Posted by nickt View Post
    When you say 'more', I assume you mean bigger opening, a lower number? It's stuck at 3 and you expect to see 2.8? If thats what you mean, yes that is normal. Focus on something far away and you will get down to 2.8 if you need it. You will never need it for a closeup. I forget what this lens property is called, but its normal behavior for this lens.
    Yes, my Nikon 105 macro works the same way.
    Cindy
    Flickr
    and
    My 2017 Thread
    Where the Spirit does not work with the hand, there is no art
    -- Leonardo da Vinci

    Nikon 14mm f/2.8; Nikon 16mm f/2.8 fisheye; Nikon 85mm f/1.8G; Nikon 105 f/2.8G micro VR; Nikon 180mm f/2.8; Nikon 300mm f/4 AF-S
    Nikon 18-35mm f/3.5-4.5G; Sigma 24-70mm f/2.8; Nikon 70-200mm f/2.8 VRII; Nikon 70-300mm f/4.5-5.6G VR


  8. #8
    Happy to be Canadian
    Super Mod
    Marcel's Avatar

    Re: Just got a sigma 105 lens

    Quote Originally Posted by bikeit View Post
    Thanks folks, i notice the F stop showing on the camera will not be more that F3 when the lens is F2.8 is this normal for a macro lens?
    This is quite normal as when you get into a magnification close to 1:1 you loose light and the 2.8 aperture that you've selected becomes around f 3.5. The actual larger F number is effective when you focus at infinity. So, even if you set the aperture to 2.8, if you focus at the closest focusing distance, the exif will show a smaller aperture.
    Thanks/Like aporodagon, hark Thanks/liked this post
     
    No Light = no Life.
    Please visit my Gallery and my Flickr Gallery





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