Midwest Optical Systems SU40.5-49

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Midwest Optical Systems SU40.5-49 Step-Up Adapter M40.5-M49 Step Adapters - Step-Up Step adapter part numbers are made up of the lens thread size in mm and the filter size in mm. E x: SU25.5-27; M25.5 (lens thread), M27 (filter thread) Step-Up Rings Use larger diameter filters on lenses with smaller diameter filter threads Often mandatory for shorter focal length lenses in order to prevent vignetting Available sizes: SU22.5-25.5 – SU77-105 Step-Down Rings Use smaller diameter filters on lenses with larger diameter filter threads The diameter of the filter or lighting to which step-down rings are coupled will be much smaller than the diameter of the lens (often resulting in vignetting) Show more