Which lens is better? Sigma 70-300mm or Nikon 50-200mm?

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Can anyone on here tell me what are the main differences between these 2 lenses which (in your opinion) is the better lens and what does some of the jargon mean? I'm buying a new lens (for birds etc) for my Nikon D3100 14MP DSLR Its a lot of reading but i really need help in deciding which lens to buy

1) Sigma 70-300mm DG Macro Lens for Nikon Digital SLR Cameras. £150

The Sigma lens is capable of macro photography with a maximum magnification of 1:2 at the 300mm focal length, providing you with crisp, clear close-ups. SLD (Special low dispersion) glass is used for superior correction of chromatic aberration and high image quality throughout the entire zoom range.

Focal length: 70-300mm.
Maximum aperture f/4-.
Minimum aperture f/5.6.
Manual and auto focus.
58mm filter.
Telephoto zoom lens.
Accessories included: lens caps and hood.
Weight: 545g.
Manufacturer's 3 year guarantee.

OR....

2) Nikon 55-200 DX Lens. £185

Enhance your Nikon camera experience with this 55-200 DX Lens. Featuring a silent wave motor for precision and a silent autofocus, this lens helps you deliver sharp, perfectly focused images for an impressively professional finish.

Model 55-200 DX

Nikon F lens mount.
Manual focus.
Accessories included: lens caps, hood and case.
Weight: 255g.
EAN/MPN/UPC/ISBN: 18208021567

Both from Argos http://www.argos.co.uk/static/Product/pa…
 
If you are shooting birds then you need as much magnification as you can afford. The Nikon lens dais it's manual focus only and only 200mm so not really viable. The other one is better.
 
I bought one of those sigma's for £62 off eBay last year. It was a great lens, much sharper than a tamron 70-300 that I had previously.

I ended up selling it though to fund a 70-200 f2.8 sigma (which is awesome!)

Just be careful as you need a lens with an autofocus motor for your D3100
 
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