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Sigma 18-50mm F2.8 EX DC

18-50f28
Review Date: Jul 29, 2005 Recommend? yes | Price paid: Not Indicated | Rating: 9 

 
Pros: Sharp, f2.8, size, solid built, price, hood and case included.
Cons:
Not a DG lens, No HSM, Only f22, AF-M switch could be better, my lens has AF problems.

This is my favourite "walk-around" lens on my Canon 20D.
Enough wide angle (18mm=28.8mm) and good full zoom (50mm=80mm) - an extra 10 or 15 mm on the top would have been even nicer.

f2.8 is excellent, just what I need.
Smallest aperture is f22 (why not f32, Sigma?).

Internal focusing makes it possible to use POL filters.

Closest focus distance - 28 cm.

Solid look n' feel (that goes for all EX lenses from Sigma). Fairly light. Hood fits perfect, however if you want to use the lens cap you'll need to un-screw the hood first because it's not so easy to fit the cap with the hood mounted...Personally I always use a UV or skylight filter on my lens and don't bother to use the cap. The hood itself also provides som extra protection to the lens.

The AF-M switch could have been in a better location. IMO

I don't think that Sigmas EX (Pro) series are as dust and moist proof as the Canon L lenses.

Ths lens is a DC lens, it's only for APS format digital cameras and therefore will not work on a full format analog camera. This is the reason why I don't give this lens a 10 point overall rating.

My lens have some AF problem:
I select one-spot focusing on the 20D and the lens will front-focus and correct-focus every alternate time I push the button!!
When I need to be fast, like point-n-shoot, I can never be sure wether the AF is correct or not and thats annoying.
I've sent it back for replacement and I really want the new one to be OK.
I know that there has been reports of issues regarding AF and Canon 20D but those issues have been solved from what some people say (hope it's true).