ZWO FILTER MASKS FOR EFW For EFW:EFW 7x36 it is designed to offer

it is designed to offer great rigidity but with a reasonable weight

The 3nm bandpass is only 1% of the entire visible spectrum increasing the signal to noise ratio delivering high contrast images and extremely dark backgrounds

for these instruments

two and three stars or brightest star alignment (alt-azimuth telescope need at least 2 stars for the alignment)

a precise 50mm hole offers a smooth movement on the shaft and facilitates the balancing operations while the stainless steel guarantees no corrosion

ZWO FILTER MASKS FOR EFW For EFW:EFW 7x36 it is designed to offerThe ZWO 0. 5mm thick filter masks allow you to securely install 31mm or 36mm unmounted filters into your EFW or EFW Mini electronic filter wheels. Includes M2 screws. Remove the screws securing the back cover and remove the back cover Place filters onto the filter positions. Use the included M2 screws with masks to secure the filters in place. Replace the back cover and tighten the screws. ZWO EFW Mini Filter Mask dimensions ZWO EFW 7 x 36mm Filter