Seduced by the idea of replacing three lenses for my Canon EOS 5D/III with just one, a Sigma 18-250mm zoom, at the bargain price of just £120, I responded to the Facebook Marketplace ad., and enquired as to whether it was an EF mount or EF-S mount, making it clear that the latter is unsuitable for the 5D’s full-frame sensor. I was assured that it was an EF mount, so a meeting was arranged at Beaumaris. On arrival, the lens was fitted and tested with a couple of quick shots. All seemed fine. Cash was handed over and we parted company.
I took the lens for a spin in town, only to discover that the lens is, in fact, for an EF-S mount, with extreme vignetting at the bottom end of the zoom range. The test shots I had taken were at the long end of the range, as that’s where image quality drops off the most. Foolishly, I hadn’t tested the wider angles.
No matter, I messaged the seller immediately. He’s always slow to respond, so I wasn’t unduly concerned. When he did so, he acknowledged that it was unsuitable, not having tested the lens on a full-frame camera. He said he was on his way to Holyhead, but asked what I wanted to do. I suggested meeting up again to return the lens today, only 24 hours later. His response (so far)? Silence.
I’m beginning to suspect that the lens is going to remain my property. I may be able to sell it on, I suppose, but there’s no guarantee that I’ll get my money back. Lesson learned.