query: "Lens not attached" error with Sigma lens on Nikon D3100
positive_passages.docid: 81881
positive_passages.text: Why does my Nikon D3100 give the error "Lens not attached" with a Vivitar 200 telephoto lens?
negative_passages.docid: 67822
negative_passages.text: How to determine lens undistortion values for motion tracking?
negative_passages.docid: 128028
negative_passages.text: Why can't my dSLR take close-up photos?
negative_passages.docid: 137089
negative_passages.text: Front element shattered, can I have my lens repaired?
negative_passages.docid: 87632
negative_passages.text: How do I find the thread diameter of my lens?
negative_passages.docid: 26448
negative_passages.text: How does a DX-format sensor support FX lenses?
negative_passages.docid: 71754
negative_passages.text: Why do two zoom lenses set to 200mm on the same camera produce different fields of view?
negative_passages.docid: 144558
negative_passages.text: Lens with small scratches on the front element - how do they affect IQ?
negative_passages.docid: 61989
negative_passages.text: How can I intentionally include lens flare in my photographs?
negative_passages.docid: 125591
negative_passages.text: What the heck is the sigma (f0) 600?
negative_passages.docid: 11625
negative_passages.text: Canon 50mm f1.4 no longer focuses reliably
negative_passages.docid: 143902
negative_passages.text: Can I adapt a Sigma SLR lens made for Pentax K mount to a Nikon DSLR camera?
negative_passages.docid: 66456
negative_passages.text: Why am I getting black photos when I use the Manual feature on my DSLR?
negative_passages.docid: 21984
negative_passages.text: Is there a DSLR fixed lens camera?
negative_passages.docid: 77063
negative_passages.text: Err 80 appears when I turn on my Canon EOS 5D Mark II
negative_passages.docid: 62822
negative_passages.text: How can lens cause consistent front or back focus?
negative_passages.docid: 46148
negative_passages.text: Yongnuo YN-685 underexposure issue in bounce mode at longer focal length