Hsm Canon
Canon EF-s 55-250mm IS or Sigma 70-200mm f/2.8 EX DG HSM II Macro Lens?
which one has the overall output image quality?
Does Sigma is worth buying for compared to canon regarding this kind of model?
pls advice. thanks
Although fhotoace makes some decent points a lot of his discussion is about the Nikon system. I note you are using the canon system.
Some of Sigmas early AF lenses will either lock up the body with an Err99 fault, or can be used with limited functionality, i.e. either the af or aperture (or both will not operate) so you have to focus manually or use the lens at max aperture.
To be fair to Sigma, in most cases this is their very early AF lenses, of these the majority can be rechipped at modest cost by Sigma.
To bring the discussion bang up to date, all of Sigmas current range will work on your Canon DSLR, the DG and DC suffix indicates this (DG will work full frame and APS-C, DC will work fine on APS-C cameras but vignette on full frame cameras)
If canon still have lens firmware secrets up their sleeves then Sigma have a good track record of updating their lenses to suit and rechipping existing lenses.
TO your specific question, if the two lenses are a similar cost then I would go with the 70-200 f2.8. Although it has a narrower range (the difference between 55 & 70 and 200 & 250 isn't anything to get concerned about) the resolution and focus speed that the f2.8 lens allows makes it in the pro bracket.
As good a lens as the 55-250 IS is it isn't a patch on the 70-200 for image quality, build quality (internal zoom and non-rotating filter thread for sigma), The Sigma is at least a stop faster for most of the zoom range, this opens up more low light oportunities and the f2.8 max aperture brings your centre spot AF come alive.
For the future, the EF mount Sigma will fit canon full frame and APS-C bodies, the EF-S mount lens will only fit APS-C bodies.
I use three sigma lenses, the 12-24 EX DG, 70mm Macro f2.8 DG and 50-500 EX DG alongside my L lenses (17-40, 24TSE and 200 f2.8) with no problems on my digital and film EOS bodies.
If the price is right go for the Sigma 70-200 f2.8.
The major companies have been overpricing cheaply made basic telezooms for years, Sigma can keep their costs down as they manufacture for all mounts and so have a bigger economies of scale when it comes to research & development costs etc.
At the very top end then I would stick to the manufacturers pro offerings, at the end of the market you are looking at buying third party can offer some great lenses for good prices.
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