Step-Up Adapter M35.5-M37Step Up Rings by Midwest Optical Systems (MidOpt) 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 Commonly referred to as a thread adapter Step Up Rings are most commonly used to adapt a larger diameter thread on items such as ring lights and filters to a smaller diameter thread (generally the thread on the

BN630-27 Narrow Light Red Bandpass Filter

0° Back Focal Length 18

81 mm Chief Ray Angle Not Specified Front Principle Point -1

Swivellink SLM-9

Dimensions (D x L): 51 x 55

Swivellink AFSB-3-4XS

smaller diameter thread is female

48 Flange Back (mm) 17

83 mm Rear Principle Point -8

3° Back Focal Length 21

Male Thread M77 Female Thread M67 Manufacturer Midwest Optical Systems

5 mm Angle of View @ 2/3″ 14