This 49mm-Nik(Ai) mount Macro Lens Reverse Adapter Rings is threaded on one side to fit the filter thread of your lens, the other side is mounted onto the for Nikon F mount DSLR camera body.With the lens being reversed, it greatly increases the lens macro reproduction range capabilities, this saves your cost of buying an expensive macro lens for macro photography.

Steps of use:

1.Take out your lens from your camera body.

2.Mount the adapter ring to your camera body.

3.Reverse your lens with 49mm thread and screw it to the adapter ring until it is tight.

Note: Autofocus, automatic diaphragm (AE metering), and other functions dependent on communication between camera body and lens will be disrupted with this reverse ring mounting on the camera body.

To properly use this lens reverse adapter ring, you have to meet the below two conditions:

a.You have a for Nikon F mount DSLR camera,below are some of the Nikon F mount DSLR cameras for your reference:

Compatible with for Nikon D1,D1H,D1X,D2H,D2X,D2Hs,D2Xs,D3,D3X,D3s,D4,D100,D200,D300,D300S,D700,D800,D800E,D40,D50,D60,D70,D70S,D80,D40X,D90,D3000,D3100,D3200,D5000,D5100,D7000,Fuji S1,S2,S3,S5

b.You have a lens with 49mm filter thread,below are some of the lens 

Compatible with for 49mm filter thread for your reference: 

For Sony 49mm Lens:

FE 28mmf/2.0(SEL28F 20)

FE35mm/2.8ZA(SEL35F28Z)

E30mmf/3.5(SEL30M 35)

E24mmf/1.8ZA(SEL24F18Z)

28mmf/2.8(SAL28F 28)

DT30mmf/2.8SAM(SAL30M 28)

E16mmf/2.8(SEL16F 28)

E 18-55mmf/3.5-5.6OSS(SEL 1855)

E20mmf/2.8(SEL20F 28)

DT50mmf/1.8SAM(SAL50F 18)

FE55mmf/1.8ZA(SEL55F18Z)

E 55-210mmf/4.5-6.3OSS(SEL 55210)

FE50mmf/1.8(SEL50F18F)

E35mmf/1.8OSS(SEL35F 18)

E50mmf/1.8OSS(SEL50F 18)

For PENTAX 49mm Lens:

DFA100mm/2.8Macro

DA 10-17mmf/3.5-4.5ED

DA15mmf/4EDAL Limited

DA21mmf/3.2AL Limited

DA35mmf/2.8Macro Limited

DA40mmf/2.8 Limited

DA70mmf/2.4 Limited

DA15mmf/ 4 Limited

DA40mmf/2.8 Limited

DA 50-200mmf/4-5.6EDWR

For Canon 49mm Lens:

EF-M 15-45mmf/3.5-6.3ISSTM

EF-S35mmf/2.8ISSTM

EF50mmf/1.8STM

For Sigma 49mm Lens:

70mmf/2.8DGMacroArt

Package:

49mm-Nik(Ai) Reverse Mount Ring x 1pcs

(Original Manufactory Package)