Does Sigma lenses work on the new Nikon D7100?

I'm planning to buy the new Nikon D7100 and sigma 70-200mm F2.8. I did little research on the Nikon D7100 but I couldn't find the answers for the other lenses such as Sigma and tamron.So here the question, does Sigma lenses and other different lenses beside Nikon lenses work on the D7100? Thanks!
>>> Does Sigma lenses work on the new Nikon D7100?

F/4.5 1/1250s iso100? What does that means? Nikon DSLR?

Please correct me and educate me! Thanks!

f/4.5 << What that?

1/1250s << Is this the shutter speed?

iso100 << I already know what ISO means. The lower the lights, the higher the ISO right?
>>> F/4.5 1/1250s iso100? What does that means? Nikon DSLR?

Looking to upgrade dslrs?

I currently have a nikon d3200, and while I love it, I have gotten more into photography (mostly people in nature) and would like to upgrade to an intermediate dslr. While I am biased towards nikon (I own multiple lenses, so that is one of the main reasons I would like to buy another nikon body), I am open to other brands. I also own a pentax and olympus lenses, so I would be interested in buying a body from them.
Like I said, I mostly like to do nature and people in nature, so I am looking for something with a large sensor.It doesn't have to have all the new high tech features.
I am just looking for suggestions of brands or specific bodies, really just someone to nudge me in a certain direction- so what do you suggest?
>>> Looking to upgrade dslrs?

How did Nikon corporation became successful through out the years?

How did Nikon corporation became successful through out the years?
>>> How did Nikon corporation became successful through out the years?

Which is the better DSLR camera? - 1

Which is the better DSLR camera? The Nikon D40x or the Nikon D3000? From what I've read about them they seem a lot the same… So what's the difference between them?
>>> Which is the better DSLR camera? - 1

A good camera for photography?

I need to buy a good quality camera for photography to take pictures for Architecture. I need to do this soon. Anyone know any good ones and I am a complete begginer with cameras, I have NO idea? I've heard of Nikon and Casio… but I need one that isn't too expensive (less than £200) and will be able to take very high quality photo's.
{I need to make an art portfolio and take alot of photo's of buildings}
*thanks in advance*
>>> A good camera for photography?

My mom wants a galaxy camera and i want a slr camera?

My mom wants a galaxy camera and i want a slr camera.she wants it because it has a lot of cool features and stuff.and she said shed never concider buying a nikon or canon.people tell me the samsung galaxy camera is bad so how do i convince her to buy me/us a slr camera?
Added (1). & i really love photography and putting the pics on tumblr
Added (2). DSLR***
>>> My mom wants a galaxy camera and i want a slr camera?

Help deciding what new lens to buy?

Hey I have a Nikon d3100 and want to buy a new lens for it. I have the 18-55mm and the 55-200mm that came with it in a bundle, Im taking a trip to new york in a couple months so one that is an overall good lens would help, i don't mind purchasing used.My budget is Under 400-500 dollars. I love taking pictures of the places i go and with all the people i see.
>>> Help deciding what new lens to buy?

Will this lens fit on my nikon d3100?

Http://www.currys.co.uk/gbuk/nikon-ed-af-s-dx-nikkor-55-200-mm-f-4-5-6g-telephoto-zoom-lens-00734639-pdt.html
>>> Will this lens fit on my nikon d3100?

Hi its about flash guns and hot shoes?

I have got a Sony Alpha A500 i am looking to buy a flash gun but i cant find one that is cheap enough for me… So i was looking at amazon and found a hot shoe that will fit on to my camera and that it is compatible with Canon, Nikon etc but not a sony… so i am thinking if i get this hot shoe and this flash gun will it be compatible or is it just my wishful thinking… ???

the list is below.

Flash Hot Shoe Adapter for Sony Alpha A900 A850 A750 A700 A550 A500 A380 A350 A330 A300 as FS-1100

YN-560 II LCD Screen Strobist Flash Speedlite for NIKON CANON OLYMPUS PENTAX By Sanlise
>>> Hi its about flash guns and hot shoes?

Buying a camera for a beginner.ideas please?

Hi there im looking for ideas on what camera to buy.i had a nikon d5100 a first as a gift but i didnt like it because it didnt take all lenses.i had it for a few years though.now i have had a d200 for about a year.im enjoying it and will keep it as a back up most likely or as a main.maybe just buy a new lens.im only using a tokina one now.i only do photos as a hobbie butit is something i wold like to get into more one day.i shoot portraits.i am looking for a lens at a cheap second hand price.no more then $250.as im a single stay at home mum lol ive been looking at one for a while i think its 1/1.8 50mm.it was something like that sorry if thats no help i dont have the name in my head right now.thanks for any help!
>>> Buying a camera for a beginner.ideas please?

What is OLPF Filter in Nikon?

I Heard that D7100 doesn't have this filter for having more details!
>>> What is OLPF Filter in Nikon?

Nikon d5100 sport pictures?

Hey, so I have a horse show this weekend and wanted some good pictures. I have the nikon d5100. I'll be doing fast paced events like roping, barrel racing, flags, stuff like that. I want my horse and I to be in focus and it doesn't matter about the background. What setting should I put it on and what stuff should I adjust? I would obvisouly put it on sport but should I change like the ISO? Or anything else? I know someones going to say read the manual and I have. I haven't had the camera that long so I haven't had the chance to play with it at rodeos or anything. Thank you!
Added (1). Thanks guys. We're going to be inside with dimish lighting. I'm going to play around with different settings and what not for poles while I take pictures of my friend. I'm going to be having my mom take the pictures while I'm running so that's another reason I wanted to find a good setting because she's not 'camera smart.' although I'm not either. I don't run super fast patterns since my horse is older but I still do decent times, enough where there's a blur.
>>> Nikon d5100 sport pictures?

Nikon d70 light meter?

Http://dayton.craigslist.org/pho/3596706416.html

Do you think this would be worth the buy? I'm just wondering if what he's explaining is just a setting issue. I hada similar issue with my d70s but it turned out to be a button I accidently hit.
>>> Nikon d70 light meter?

Shooting moon with nikon d3100?

What settings to use
>>> Shooting moon with nikon d3100?

Shooting moon with nikon d3100? - 1

Shooting moon with nikon d3100?
>>> Shooting moon with nikon d3100? - 1

Good video editor for PC?

I really need a good video editor, something that does not have a water banner in the middle, something that has good resolution, like for example, I shoot videos with a Nikon d3100 camera, but when I upload the videos on YouTube, the resolution is like 360 or 420 or something, so I need an editor that KEEPS the good quality of the camera, and something that can crop videos and add background music

Diode load iMovie but I don't have a Mac:/

If you want to see the YouTube videos I do my channel is called youngbeauty1111 I do it with my friend: P
>>> Good video editor for PC?