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【Interface】 metal alloy material [Interface] Canon Canon EOS bayonet - 49mm screw Alloy material， solid and secure. Mating thread accurate， smooth installation. The so-called inverted ring， is the reverse installation of the lens to the body of the accessories， mainly based on the reverse lens refraction for macro photography， the effect is quite good. Generally the default maximum aperture， iris can not be adjusted， the need to adjust their own use of the camera to achieve a clear focus distance.   Use this anti-ring， you can make your coke lens micro-lens. Can take the lens upside down to receive the body， in order to achieve the purpose of using ordinary lens macro photography， the general for the SLR digital camera reverse the lens for macro shooting. Reverse the lens is the front end of the lens (filter side) through the bayonet - screw anti-reverse ring on the camera body for macro photography. The principle is: General 85mm lens back focal length is shorter than the front focal length， the effective focal length after the reverse becomes shorter， so as to achieve the effect of close-up. Such as: 50mm standard lens reverse connection can reach 1: 1 image ratio. Canon eos bayonet reverse mount 49mm lens counter ring for 49mm aperture reverse， super macro effect， the lens can be turned over to the body， in order to achieve the purpose of using ordinary lens macro photography， The advantage is: 1， to further increase the distance between the lens and the focal plane; 2， when shooting three-dimensional scenery to achieve good results; 3， simple and cheap. Note: In addition to this caliber， but also through the transfer ring， into the other caliber you need. In addition， this bayonet lens can be connected to any bayonet. Inverted there is another advantage: as long as the inverted ring and the body is the same bayonet， body and the lens can be a different bayonet， such as cheap Russian ultra-wide-angle lens can be inverted in any body， access to great magnification However， after the dog head inverted or dog head Oh! weakness is: 1， reverse， the lens focus ring role is very small， mainly by moving the camera and the distance between the subject to focus; 2， the camera aperture linkage system no longer works; 3， short depth of field， focusing difficulties; 4， can only use the focal length between 20mm to 85mm lens; 5， the original lens bayonet lens completely exposed， shooting will produce glare glare phenomenon. Note: 1. After connecting， the lens can not be AF， the aperture full manual (before buying make sure your lens has no manual aperture control) 2.Please turn off the fuselage after the replacement ring， in violation of the norms of the consequences caused by this shop is not responsible! 3. Due to large magnification after the inverted， co-focal range is very short， you need to move the camera back and forth to find the focus， so this ring is suitable for more patient players to use， the other best with the micro-frame together， it will be convenient Focus. <img style="max-width: 750.0px;" src="https://img.alicdn.com/imgextra/i1/1999898931/TB2zSj3XtyHJuJjSZFIXXXQTVXa_!!1999898931.png" align="absmiddle">

For Canon 49mm lens back ring inverted ring EOS-49MM back-up ring macro assistant