Midwest Optical PR120-49

Midwest Optical SU37-49, Step-Up Ring, from M37 x 0.75 To M49 x 0.75, 31.5 mm Outer Diameter, 33.2 mm Clear Aperture

Midwest Optical SU46-49, Step-Up Ring, from M46 x 0.75 To M49 x 0.75, 51 mm Outer Diameter, 43.5 mm Clear Aperture

Midwest Optical SD52-49, Step-Down Ring, from M52 x 0.75 To M49 x 0.75, 54 mm Outer Diameter, 48.3 mm Clear Aperture

Midwest Optical SD55-49, Step-Down Ring, from M55 x 0.75 To M49 x 0.75, 57.4 mm Outer Diameter, 48.3 mm Clear Aperture