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I'm not sure. I use all canon lenses. my old photography teacher told us that Sigma and Tamron do not make their lenses for either Canon or Nikon and therefore you will not get the same quality pictures as with a lens specifically designed for the equipment. It made sense at the time. I definitely want a quality lens.
Most brands have gems in their line up...and also some dogs. Canon makes some of the best lenses available, but also so pretty crappy ones.
Sigma & Tamron also have very good lenses and some pretty bad ones as well. So you have to make sure that you are comparing apples to apples, not apples to oranges.
At the top of the range, most will tell you that Canon's lenses are the best (for Canon cameras). The L series lenses are very very good...but you will pay a lot for them.
You can get lenses with very similar specs, from Sigma or Tamron, but at a price that is often half that of the Canon.
Specs don't often show image quality (or build quality) so there is the difference.
Just how much better the Canon lens's are...is up for debate. It might be 5% better or it might be 40% better. You have to decide for yourself, whether or not that extra bit of image (and often build) quality is worth double or triple the price. For some people, it is. For many, it's not.
So to sum up...you can get very good lenses from off-brand companies, at pretty good prices...but if you want the 'best' tool for the job...stick with top of the line lenses (and pay a lot for them).
I did sort of throw that out there. There are plenty of actual tests and numbers that do try to quantify lens performance...I'm not into all that. I go by what I see and what I hear from other photographers.You mention that the lens may be 5% better or maybe 40% better. It seems like you kinda threw that out there to say it might be a little better or a lot better. My question is, is there a quantitative way to analyze these lenses in a percent fashion like this?
I'm not sure. I use all canon lenses. my old photography teacher told us that Sigma and Tamron do not make their lenses for either Canon or Nikon and therefore you will not get the same quality pictures as with a lens specifically designed for the equipment.