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Canon General / Help with eBay/back focus situation plz!
« on: August 25, 2011, 05:07:21 PM »
Ok, so a friend of mine recently asked me to sell her Sigma 120-400mm lens on eBay. Which has already sold but the buyer just sent me an email saying that the lens has back focus issues at 400mm. Before I auctioned the lens, I did some tests of my own to make sure that it works properly and I also took my friend's word that the lens works in perfect order. Right now, I'm not sure if this is a case of nitpicking, buyer's remorse or maybe the buyer is just not used to working with 400mm on a DX (50D). Another thing that's worth noting is according to the UPS records he got the lens, tested it and emailed me all within 45 minutes. I'm sure that there are photographers out there than can test a lens completely in that short amount of time but I'm not sure this guy is one of them.
I've asked him to email me a picture at 400mm and I'm also getting in touch with my friend (the former owner of the lens) to see if she has any pictures taken at 400mm. My question is now that I don't have the lens anymore, how can I test the picture for back focus? Also if there is a back focus problem, wouldn't it be across the whole range of the lens and not just at 400mm? Can anybody tell me if 50D has a focus fine tuning and what menu do I get it from?
I've asked him to email me a picture at 400mm and I'm also getting in touch with my friend (the former owner of the lens) to see if she has any pictures taken at 400mm. My question is now that I don't have the lens anymore, how can I test the picture for back focus? Also if there is a back focus problem, wouldn't it be across the whole range of the lens and not just at 400mm? Can anybody tell me if 50D has a focus fine tuning and what menu do I get it from?