The 365Astronomy 2" to 1.25" Filter Adapter lets you use 1.25" filter with 2" accessories.The 365Astronomy 2" to 1.25" Filter Adapter lets you use 1.25" filter with 2" accessories.
It converts a 2" filter holder into a 1.25" filter holder. 2" filters are only called 2" filters, because their outer diameter is 2", so these can be screwed into 2" accessories or into a nosepiece of a 2" eyepiece.
The thread sizes are: M48x0.75 male on the outside and M28.5x0.75 female on the inside.
Optical length is 1mm.
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