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Thread: Sigma 50-150 lens on a Canon 7D

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    Member hee's Avatar
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    Sigma 50-150 lens on a Canon 7D

    Spurred by an upcoming trip to Alaska I have notionally made the jump from entry level to enthusiast by going from a faithful EOS 350 lens kit to ordering a Canon 7D kit (18-85mm lens) and a Sigma 50-500mm OS lens together with 95mm UV filter and polariser. However my lack of knowledge is already showing - why does the Sigma box contain a step-down ring ("for APS-C cameras") and is there a problem with just using the lens on an APS-C camera with a 95mm filter?

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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    Welcome aboard - AP, as well as your upcoming trip.
    So that way you can attach the appropriate (hopefully included) lens hood for the APS-C sensor cameras.
    Am.
    CC, Image editing OK.

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    You state you have bought a 50-150 and a 50-500 Sigma. I don't think Sigma do a 50-150, but they do do a 150-500 OS and a 50-500 OS. So which is it? I have the 150-500 and have no such adapter. Works equally well on my D700 and D7000.
    Cheers,
    Ian

    All the 7's: D700, D7000, D70

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    Thanks guys but I'm still a bit puzzled
    Ian - The lens in question is a Sigma 50-500mm OS (which I think is what I wrote. The other lens is a Canon 15-85mm which comes with the camera kit).
    CC - I would have thought that the lens hood that comes with the lens would fit the 95mm thread, which I assume would be the default setup for a full-frame camera.
    My query revolves around why reviews refer to the step-down ring "for use with APC-S cameras"
    I guess ultimately I'm trying to work out if the lens will work ok on the 7D without the stepdown ring, given that I have bought 95mm polariser and UV filters.

    - - - Updated - - -

    Sorry, my mistake, I see that I wrote "50-150" in the heading which was an error

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    Ausphotography Regular agb's Avatar
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    I think this is what you need to know.
    Hood Adapter HA1030-01 (Supplied)

    Hood adapter extends the length of the lens hood and provides more effective shading when used with digital cameras with an APS-C size image sensor.

    * When using the APS-C Hood Adapter HA1030-01 with digital cameras with larger than APS-C size image sensor, vignetting will occur. Please remove the hood adapter if you are using these cameras.
    The age of entitlement isn't over, it's just over there where you can't get to it.
    When several possibilities exist, the simplest solution is the best.
    "There are no rules" Bruce Barnbaum, The art of Photography
    Graham


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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    Better said than I, Graham.
    Am.

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    Ausphotography Regular agb's Avatar
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    Quote Originally Posted by ameerat42 View Post
    Better said than I, Graham.
    Am.
    Much better than I could say it too. Sigma gets the credit.

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    Regular Visitor Wayne63's Avatar
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    Welcome to AP, enjoy the site and look forward to seeing some of your pics in the forums
    Regards
    Wayne

    CC Always welcome as its a great way of Learning


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    Administrator ricktas's Avatar
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    I moved your thread from Introductions as it isn't really an introduction, but rather a gear related question.

    Now that we have given you your answers, hope we get to see you and your photos on the forums.
    "It is one thing to make a picture of what a person looks like, it is another thing to make a portrait of who they are" - Paul Caponigro

    Constructive Critique of my photographs is always appreciated
    Nikon, etc!

    RICK
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    A final word on this now that the lens and filters have tuned up (note that my heding should hve read Sigma 50-500 OS
    1. the step-down ring (95mm-86mm) appears to serve no purpose at all other than allowing you to purchase slightly cheaper and small filters. It apparently can't be used with a polariser so I'm not sure why they bother including it,other than to confuse new-chums like me.
    2. Both the lens hood and the APS-C hood adapter (basically an extension tube to the lens hood for APSC cameras) fit to the outside of the lens, or each other, via a bayonet fitting and seem to have no relevance to the step-down ring which thread-screws to the the inside the lens rim (as do the 95mm filters)w
    3. Crucially for me, I am able to use the 95 mm UV filter and polariser that I had already ordered and paid for. Phew.
    4. I'll be interested to see what practical difference fitting the APS-C hood adapter makes - can't quite work out the physics!

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