ZWO Filter Masks
- Securely Mounts 36mm Unmounted Filters
- Compatible with All 7-Position ZWO 36mm EFWs
- Includes M2 Mounting Screws
- Prevents Internal Light Leaks
This ZWO Filter Mask set provides the essential hardware for securely installing unmounted 36mm filters into any generation of the ZWO 7-position electronic filter wheel. The kit includes 10 individual masks and all necessary M2 screws, ensuring a firm, light-tight fit that prevents stray light from bypassing the filter and reflecting within the optical train. These masks are direct replacements, identical to the hardware included with the original filter wheel.
Replacing or installing filters with these masks is a straightforward process. You only need to remove the filter wheel's back cover, place your 36mm filters into their respective slots, and then use the included masks and M2 screws to lock them into position. This design ensures the filters remain perfectly seated and centered in the light path during rotation.
These filter masks are confirmed to be compatible with every version of the 7-position, 36mm ZWO Electronic Filter Wheel. Whether you have the first generation, the EFW II, or the current 2025 revision, this mask set will fit perfectly. This universal compatibility makes it the correct choice for any user needing to replace lost parts or wanting a spare set on hand for quick filter changes in the field.
The primary purpose of these masks is to securely hold 36mm unmounted filters inside the ZWO 7-position electronic filter wheel. They press the filter against the carousel, preventing it from shifting or tilting, and block stray light from leaking around the edges of the filter, which is critical for maintaining high-contrast images.
No. This mask set is specifically designed for the ZWO 7x36 EFW (7-position, 36mm) models only. They will not fit the carousels for 5-position wheels or wheels designed for different filter sizes like 1.25" or 2".
The package includes enough masks and M2 screws to install a full carousel of seven filters in your ZWO 7x36 EFW, with spares left over. This is useful in case a screw or mask is lost during installation.
Yes, this kit includes a full set of the M2 screws required to attach the masks to the filter wheel carousel. You will not need to source any additional hardware.
You do not need new masks if your original ones are in good condition. However, having this spare set is highly recommended. It allows you to pre-mount your narrowband filters on the spare masks, making the physical swap much faster and reducing the risk of dropping a tiny screw in the dark while working on your imaging rig.
Yes, as long as the filters are standard 36mm unmounted filters, these masks will provide a secure fit regardless of the filter manufacturer. They are designed to hold the filter by its edge, accommodating minor thickness variations between brands.
| SKU Number | ZWO-EFW-7-MASKS |
| MPN | ZWO EFW-7-MASKS |
| Product Type | Filter Wheel Adapter |
| Compatibility | ZWO 7x36mm Electronic Filter Wheels (All Generations) |
| Warranty | ZWO - 2 Years |
ZWO 7-Position 36 mm EFW Filter Masks
M2 Screws