Take out your lens from your camera body. | Mount the adapter ring to your camera body. | Reverse your lens with filter 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 Fujifilm FX X mount camera,below are some of the FX X mount cameras for your reference: Compatible with for Fujifilm FX X Mount X-A5 X-A20 X-A10 X-A3 X-A2 X-A1 X-T2 X-E3 X-E2S X-E2 X-E1 X-T100 X-T10 X-T1IR X-T1 X-T20 X-H1 X-M1 X-Pro1 X-Pro2 | b.You have a lens with 49mm filter thread, below are some of the lens(Mounts Any lenses with Ø 49mm filter thread to a FX X-Series Camera) | Compatible with For Sony 49mm Lens: FE28mmf/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), | Compatible with For PENTAX 49mm Lens: DFA100mm/2.8Macro, DFAMACRO100mmf/2.8WR, 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, FA28mmf/2.8, FA43mmf/1.9 Limited, FA50mmf/1.4, FA77mmf/1.8 Limited, DA15mmf/ 4 Limited, DA40mmf/2.8 Limited, FA35mmF/ 2, DA35mmf/2.4AL, DA 50-200mmf/4-5.6EDWR | Compatible with For Canon EF 49mm Lens: EF-M 15-45mmf/3.5-6.3ISSTM, EF-S35mmf/2.8ISSTM, EF50mmf/1.8STM,