The lens is firmly in place, but with the Nikon 5100 I have the problem that "no lens" is displayed as an error from time to time. Then it's time to screw it on and off again. 

Lens suitable for Nikon SLR with F-mount. Mount Type ‎Nikon F With AF/MF switch on lens. ‎35mm Fixed Focal Length Lens Specification: Yongnuo's fast EF 35mm wide-angle lens with its fast F/2 aperture captures every moment even in the lowest light conditions. It has a minimum focusing distance of only 0. 25 cm tall. Even when you're close, you can still get the natural wide-angle effect. It's affordable and ideal for anything that requires excellent optical performance and a moderate wide focal length. Features: Supports Auto Focus (AF) and Manual Focus (MF) modes. 2. The aperture blades up to 7 pieces, which allow you to shoot the near-circular diffused plaques, correspondingly narrow the apertures can shoot the 14 astral effect. 3. Features a high-precision chrome bayonet mount bayonet mount, effectively improving the quality of the camera body and improving the bayonet strength, wear resistance and corrosion resistance for durable use. 4. Full line of products are glass lenses. 5. Support full-frame cameras and APS-C format, support M/AV/TV/P and other camera shooting modes, and can display the aperture data in the EXIF information. 6. Multi-coated lenses, effectively improve transmittance and suppress ghosting and flare in backlit shooting. 7. Gold plated for the metal contacts, effectively improve signal conductivity and corrosion resistance. Package Contents: 1 x YN35mm F2 Prime Lens for Nikon, 1 x Front & Rear Lens Cap, 1 x 52mm Lens Cap, 1 x User Manual and 1 x Original Box. see less Amazon Best Sellers Rank: #6,529 in Camera & Photo ( See Top 100 in Camera & Photo) #182 in SLR Lenses 

Yes, if it is the variant with a Nikon connection. It is capable of small screens. 

hello ， the AI to EOS adapter ring i ssuitable for nikkon AI Mount lens and canon camera body. so you need to confirm your sigma lens specific mount . We care about our customers, any questions, you can ask us directly at customer@kentfaith.com. All emails would be replied in 24 hours, no exception. 

Yes it will fit, the lens will become completely manual though. Not familiar with that lens, but hopefully it has a aperture adjustment ring, otherwise you have to use the ring on the adapter which isn't very accurate and doesn't have any number markings. But to answer your question, yes, and good quality.