2 inch (M48) Filter Ring with Retainer
This is an empty filter ring in the 2" or M48 standard size that
will hold 1.850" (47mm) diameter round glass up to 1/8" thick.
The retainer ring threads in to hold the glass. Black anodized
aluminum, outside diameter is ~1.996".
The ring has male threads on one side and female on the other,
so it can be used as a 0.3" spacer. It can also be used as a
99.99% transmission, near zero reflection, extremely wide band
Prices include shipping in the USA!