Introduction: The bad attitude
In the past, when I was working in a photo store, the aversion towards other than original lenses (especially Sigma) was really overwhelming. A common malady of these lenses was that the same lens types differed from piece to piece and sometimes fell apart after half year of usage. An internal joke was that every Sigma lens purchase should include some free instant glue. These lenses also had issues with back-focus. Not to mention the fact that older Sigma lenses had to be re-chipped to work with newer digital SLRs. I have seen a lot of frustrated customers so you can imagine my attitude towards this specific brand. This was ten years ago.
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