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Old Feb 4, 2014, 5:40 AM   #1
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Default Different size filters?

I've already been given help on the different brand of filters, so I'm good there, but I do notice different sizes of filters, 55mm, 60mm, 77mm, etc, etc. How do I know which size will fit the camera? For those who don't know, I don't have the camera yet but I will be purchasing the Nikon D7100 and a 17-70mm sigma lens. Any help is greatly appreciated.
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Old Feb 4, 2014, 6:31 AM   #2
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You will find the 17-70 Sigma lens info along with the lens literature,it would let you know the lens diameter and the size of the filter it takes.
Alternatively if you go to the camera store,people there would know what size filter it needs.
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Old Feb 4, 2014, 7:37 AM   #3
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You get filters for the lens, not the camera.

As wanaclick has said, the lens literature will tell you what size filter it uses. The webpage for the Sigma 17-70mm F2.8-4 DC Macro (OS)* HSM | C, under the TECH SPECS tab, says the filter size is 72mm.

You may also notice that every lens has a notation engraved on it like "72". The number following the indicates the filter size, which in this case is 72mm.
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Old Feb 4, 2014, 10:28 AM   #4
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Okay, so I could have five different sized lenses and would need five different sized filters if I wanted a specific filter for all lenses? I'm assuming people only need one filter per camera and they use it primarily on one lenses. I'm also assuming that most people only use filters on prime lenses.
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Old Feb 4, 2014, 12:44 PM   #5
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In general, filters like Neutral Density Filters or Circular Polarizing Filters would only be used for lenses that you might use to capture images whose composition contains a lot of sky, which would only include lenses with short focal lengths/wide angles of view. Also, those filters significantly limit the amount of light that gets through the lens, so you'd generally only use them with fast lenses. Thus, you wouldn't necessarily need a CPL or a ND for each and every lens.
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Old Feb 4, 2014, 2:54 PM   #6
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You can also purchase step up rings to adapt smaller lens threads to larger filters, so if you purchase filters for the largest lens you have, you can use them on others as well.

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Old Feb 4, 2014, 4:48 PM   #7
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While Circular Polarizing Filters can be a nice addition to the Sigma 17-70, you may want to be judicious in its use. They can create vignetting when used with short focal lengths/wide angles of view.
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Old Feb 4, 2014, 6:28 PM   #8
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Okay, I'm gonna hold off and just wait until I've had enough time with the camera and the photos I take...I may not even want one in the long run. I do appreciate everyone's input. I should probably be focusing more attention on a bag and possibly a tri-pod.
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Old Feb 5, 2014, 7:50 AM   #9
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Initially, you're going to have 1 camera with one lens. Get accustomed to them, then figure out what else you want to do, then figure out if you need to carry it all around with you.
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Old Feb 11, 2014, 5:45 PM   #10
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I had decided against getting any filters or any other lens accessories until I learned the camera. While doing a little research I came across the lens I was getting but it comes bundled with several filters and other things...all made by Sigma and all for $10-$20 more. I guess I'm wondering if it's worth a glance? Should I even consider it...even if I don't use them right away?

*edit* whoops, forgot the link: http://www.amazon.com/Sigma-17-70mm-...Cleaning+Cloth

Last edited by spiritgod; Feb 11, 2014 at 6:07 PM.
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