0.5X 0.37X 0.75X Camera AdapterTo couple camera to microscopeThrough microscope or telescope or eyepieces tubeAdjustable (Focusable) or fixed lens insideDifferent reduction lenses for different sensor sizeParfocal with different microscope and telescope objective lensesDiffraction limited MTF performanceAperture totally coupled with your microscope or telescope's exit pupilSpecificationAMA0371> Fit to 1/4" 1/3" sensor2> 0.37X magnification3> Manually focusable4> Parfocal with the eyepiece5> C-mount to Dia.23.2mm eye tubeAMA0501> Fit to 1/2" 2/3" sensor2> 0.50X magnification3> Manually focusable4> Parfocal with the myepiece5> C-mount to Dia.23.2mm eye tubeAMA0751> Fit to 1/1.8" 1" sensor2> 0.75X magnification3> Manually focusable4> Parfocal with the myepiece5> C-mount to Dia.23.2mm eye tubePackage incluede:1 x C mount adapter lens