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ATTENTION: I will be unable to ship orders from 6/18/2022 - 7/4/2022. Orders placed during this time will be shipped starting 7/5/2022 in the order they were received. Thanks for your patience and your business!

Filter Centering Masks for Filter Wheels

Now being used in the Condor Array Telescope in Chile, a project by Stony Brook University and funded by the National Science Foundation!

These Filter Centering Masks will make it easy to center your filters in a filter wheel, and will block any potential light leak due to the filters being off-center in the filter disk seat.   Simply place your filter in the filter wheel disk, place the Filter Centering Mask over the filter and fasten with screws.   Sold in sets of 7, 8 or 9 depending on the filter mask size. 

Available for ZWO, QHY, Atik and QSI filter wheels.

Installation note: make sure the two flat sides of the mask point toward the center.   


2-3 day Priority shipping available also. International shipping calculated at checkout. Please see the shipping tab for more info.

Printed in durable, temperature tolerant PETG filament. 

ZWO-50mm (7) - $16
All Filter Brands - 50mm Round Filters
QHY-50mm-3mm (7) - $16
50mm Round, 3mm Thick Filters
ZWO-49.7mm (7) - $16
Astrodon 49.7mm Round Filters
QHY-49.7mm (7) - $16
Astrodon 49.7mm Round Filters
ZWO-36mm (7) - $16
All Filter Brands - 36mm Round
QHY-36mm-3mm (7) - $16
36mm Round, 3mm Thick Filters
ZWO-31mm (8) - $16
All Filter Brands - 31mm Round
QHY-36mm-2mm (7) - $16
36mm Round, 2mm Thick Filters
Atik-EFW2-36mm (7) - $16
All Filter Brands - 36mm Round, EFW2 Wheel
QHY-31mm-3mm (7) - $16
31mm Round, 3mm Thick Filters
Atik-EFW3-50mm (7) - $16
All Filter Brands - 50mm Round, EFW3 Wheel
QHY-31mm-2mm (7) - $16
31mm Round, 2mm Thick Filters
Atik-EFW3-36mm (7) - $16
All Filter Brands - 36mm Round, EFW3 Wheel
QHY-50mm-5mm (9) - $17
50mm Round, 5mm Thick Fitlers
QSI-50mm-3mm (8) - $17
50mm Round, 3mm Thick Filters
QHY-50mmSQ (7) - $16
All Filter Brands - 50mm Square Filters
QSI-50mm-2mm (8) - $17
50mm Round, 2mm Thick Filters
(QHY-50mm-2mm (7) - $16)
Older 50mm Round, 2mm Thick Filters
QSI-49.7mm (8) - $17              
Astrodon 49.7mm Round Filters