Discovery Astrophotography with ZWO ASTRO

2”-1.25” Filter Adapter Ring


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The filter adapter ring that allows you to use the filter with a smaller filter thread size.

No need for buying another set of filter drawers, the 2”-1.25”filter adapter ring will help you directly fit the 1.25”filter onto 2” filter drawer or filter wheel.

Supported list:


ZWO 7×2” EFW

ZWO filter drawer series, including M42 filter drawer and M54 filter drawer

The effect when connecting 2”filter drawer:

The effect when connecting 2”EFW:

We recommend you use ASI533, ASI183, ASI294 and ASI1600 with this filter adapter ring since cameras with bigger sensors may lead to vignetting when matching the 1.25” filters.

Connecting drawing:

Mechanical drawing:


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2”-1.25” Filter Adapter Ring