digital picture lens comparison.

I wouldn't be surprised, the Sigma doesn't have an amazing reputation (good, but not amazing). However, if you need this range, f/2.8, and don't have £1000 to spend, you don't really have much choice!

And I put limited faith in tests like this to be honest. If it'll give me usable shots at the size that I view/print, I couldn't care less what was going on at 100% in the corners :D
 
Sigma lens-quality can be awesome...it can also be rubbish - from what I've seen on my travels there's also no consistency across the various models they make. It's not even a case of "the 17-35 is great and the 24-70 is rubbish" - some may be good, others not...
Build-quality is also a bit haphazard. A friend's 14mm died for no apparent reason on a trip to Afghanistan...when he packed it away in UK it was working...when he unpacked it in Camp Bastion it was dead...wouldn't focus at all...not even on manual...

If you're lucky enough to get a good one it'll probably last for ever and then some - but you won't know til you've bought it...
 
i dont know what way to turn now, as im new to photography i dont understand the full in's and out's, and dont know why but was under the assumtion that f2.8 would be sharp?? as well as good in low light.
but then again from reading other peoples views on other thread that the higher the f number (f8) the more IQ there is.. is IQ sharpness??

after all i might just purchase another 28-135, as it did serve me well for its limited life and funds wont allow a L lens.. :shrug:

also whats the difference between the siggy 28-70 and the siggy 24-70.. apart from the obvious 4mm??
 
westley byford said:
i dont know what way to turn now, as im new to photography i dont understand the full in's and out's, and dont know why but was under the assumtion that f2.8 would be sharp?? as well as good in low light.
but then again from reading other peoples views on other thread that the higher the f number (f8) the more IQ there is.. is IQ sharpness??

after all i might just purchase another 28-135, as it did serve me well and funds wont allow a L lens.. :shrug:
Click to expand...

Basically lenses get sharper when they are stopped down, to a point (usually around f/8 - f/16 ish). When a lens is at f/2.8, it's operating right on the edge of what it can achieve. This means image quality is always going to suffer a little. On the very expensive lenses, stopping down will make much less difference than on cheaper ones, but I think I'm right in saying that a lens will almost always require to be stopped down to get maximal sharpness/image quality.

Whether you can actually notice these differences is another matter, and usually depends on whether you check every shot at 100% or not....

Chris
 
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