Step-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 lens).
Smaller diameter thread is male, larger diameter thread is female.
|Manufacturer||Midwest Optical Systems|
Step-Up Ring Downloads