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    D7100 help/question

    To start off I'm anything but technical. I was playing around on my camera a few weeks ago some how some where I found a "chart/graph", for lack of a better term, that was a color chart. in the center was a little box you could move around. Question 1, what is this chart called. Question...
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    Weekly Challenge Oct. 23 - 29: Back Yard

    OK since I choose it I'll start it. "Porch Sittin"
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    Filters question

    I have a few warming filters, from back in my film days, mostly I used them for snow photography. Question is with today's digital cameras are warming filters still necessary for snow? Thanks
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    Serial numbers

    Is there a way to check serial numbers to see if equipment is gray market or USA? Thanks
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    Weekly Challenge July 30 - August 6: Books

    Colonel Henry Bouquets quarters, 1758. The Battle of Bushy Run. 1/250 f/11 ISO 400 17mm Nikon D7100
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    Adaptor question

    I had a neighbor give me a Sigma 105mm lens. I believe it's for a Canon ef (EOS) mount, at least that's what I remember Bill having. Does anyone know if there is an adaptor ring for this lens to a D7100 or D5100? Thank you.
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    Weekly Challenge Jul 3 - Jul 9 - : Topic Patriotism - patriotism or independence

    The Tower of Voices Flight 93 National Memorial. Apt. Priority 1/20 F5.6 ISO 100 17mm Nikon D7100
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    National Camera Day

    Happy National Camera Day, Saturday June 29 2019, just thought I'd throw that out there. For those who care.
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    What is backfocus?

    I was cruising through lenses on ebay reading discriptions and on one the seller said, "works well on my D750 on live focus mode but has back focus if I use normal mode." Can someone please explain this? Thank you
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    Sigma Macro lenses

    Are they any good? Got a chance to buy one for $80.00. 105mm. Thank you
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    DX & FX lenses

    I know newbie question. What is the differance between the two and how can you tell them apart?
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