IQ: Sigma 18-50 f2.8 vs Nikon 18-200 VR

Discussion in 'Photography Equipment & Products' started by PushingTin, Jun 2, 2007.

  1. PushingTin

    PushingTin TPF Noob!

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    I have the Nikon 18-200 which is a great travel lens but looking for something that might give better IQ in the 18-70 range (I have a 70-200 for longer reach stuff).

    Will the Sigma 18-50mm f/2.8 EX DC SLD ELD Aspherical Macro Lens give me better Image Quality than the 18-200? Does anyone have any comparisons between these lenses or does anyone use this lens?
     
  2. Don Simon

    Don Simon TPF Noob!

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    I'm not sure they're all that comparable... it may be that at 50mm at f/8 you'd find it hard to see much difference. But of course the Sigma has a constant max aperture of f/2.8; the Nikon slower and variable max aperture. The Sigma will provide extra speed if you need to use a faster shutter speed; on the other hand the Nikon has VR and the Sigma doesn't, so it may be a question of whether wider aperture or VR would be more useful to you. The Nikon of course has a much larger zoom range... and for that reason alone I would expect that yes, the Sigma will provide better image quality (to use that fairly broad term) within that range - at least it certainly should if it's anything like the equivalent Tamron.
     
  3. coastietech

    coastietech TPF Noob!

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    The Sigma 18-50 f2.8 has average reviews at best. Almost every review I have read has compared it to the Tamron 17-50mm f2.8 and they all say that other than build quality the Tamron wins in every way. Not to mention I think the Tamron is cheaper as well. I will be buying the Tamron in about a month so if you are still looking at that point I will let you know what I think about it. Or you can check out the reviews of both lenses at Popphoto.com
     
  4. fmw

    fmw No longer a newbie, moving up!

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    Theoretically, yes. The 3X zoom range of the Sigma is way, way, way easier to correct for a lens designer than the 10X zoom range of the Nikkor. Since I haven't tested either lens, I can't tell you definitively but I would be willing to bet on my theoretical answer.
     
  5. The_Traveler

    The_Traveler Completely Counter-dependent Supporting Member

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    [I have the 18-200 and] I am considering adding the 17-55 Nikon to replace the 18-70 kit lens (it is sharp but doesn't seem to get the color saturation the better lenses get.)
     
  6. PushingTin

    PushingTin TPF Noob!

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    I would love the 17-55 but its out of budget reach :(

    Sigma just in budget reach, but is it worth it? Dont want to spend more money on a lens I wont be happy with.
     
  7. Don Simon

    Don Simon TPF Noob!

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    Then borrow one or just get to a store and take as many test shots as they'll alllow :) and you might also want to look at the Tamron 17-50mm f/2.8.
     
  8. PushingTin

    PushingTin TPF Noob!

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    Unfortunately here in SA, the stores only keep limited number of lenses, mainly the kit stuff and hot sellers. I would need to order the lens, cant ask them to order just to test it.
     

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