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Buckeyestargazer Shop will be closed 12/25/2025 - 12/31/2025.  Orders placed during this time will be shipped in the order they were received starting 01/02/2026.

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, QSI, Moravian (GXCCD), Player One, Pegasus Indigo, SBIG AFW and ToupTek filter wheels.

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


FREE SHIPPING (USA 1st Class)

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-50mm-SQ (7) - $16
All Filter Brands - 50mm SQUARE Filters
QHY-49.7mm (7) - $16
Astrodon 49.7mm Round Filters
ZWO-49.7mm (7) - $16
Astrodon 49.7mm Round Filters
QHY-36mm-3mm (7) - $16
36mm Round, 3mm Thick Filters (CFW3 only)
ZWO-36mm (7) - $16
All Filter Brands - 36mm Round
QHY-36mm-2mm (7) - $16
36mm Round, 2mm Thick Filters (CFW3 only)
ZWO-31mm (8) - $16
All Filter Brands - 31mm Round NOTE:  will NOT work with ZWO Mini Filter Wheel
QHY-31mm-3mm (7) - $16
31mm Round, 3mm Thick Filters
Atik-EFW2-36mm (7) - $16
All Filter Brands - 36mm Round, EFW2 Wheel
QHY-31mm-2mm (7) - $16
31mm Round, 2mm Thick Filters
Atik-EFW2-50mm (7) - $16
All Filter Brands - 50mm
Round, EFW2 Wheel
QHY-50mm-5mm (9) - $17
50mm Round, 5mm Thick Fitlers
Atik-EFW3-36mm (7) - $16
All Filter Brands - 36mm Round, EFW2.2/3 Wheel
QHY-50mmSQ (7) - $16
All Filter Brands - 50mm Square Filters
Atik-EFW3-50mm (7) - $16
All Filter Brands - 50mm Round, EFW2.2/3 Wheel
(QHY-50mm-2mm (7) - $16)
Older 50mm Round, 2mm Thick Filters
QSI-50mm-3mm (8) - $17
50mm Round, 3mm Thick Filters
GXCCD-50mm (7) - $16
Moravian, All Filter Brands - 50mm Round Filters
QSI-50mm-2mm (8) - $17
50mm Round, 2mm Thick Filters
GXCCD-50mm-SQ (7) - $16
Moravian, All Filter Brands - 50mm SquareFilters
QSI-49.7mm (8) - $17              
Astrodon 49.7mm Round Filters
PEG-50mm-3mm (7) - $16
Pegasus Indigo, 50mm Round, 3mm Thick Filters
PlayOne-50mm-3mm (7) - $16
50mm Round, 3mm Thick Filters
PEG-50mm-2mm (7) - $16
Pegasus Indigo, 50mm Round, 2mm thick filters
PlayOne-50mm-2mm (7) - $16
50mm Round, 2mm Thick Filters
Toup-36mm-2mm (7) - $16
ToupTek and OGMA, 36mm Round, 2mm Thick Filters
PlayOne-36mm-3mm (7) - $16
36mm, 3mm Thick Filters
Toup-36mm-3mm (7) - $16
ToupTek and OGMA, 36mm Round, 3mm Thick Filters
PlayOne-36mm-2mm (7) - $16)
36mm, 2mm Thick Filters
Toup-50mm-2mm (7) - $16
ToupTek AFW-L, 50mm Round, 2mm thick filters
SBIGAFW-50SQ (10) - $20
SBIG AFW filter wheel, 50mm square filters (10)
Toup-50mm-3mm (7) - $16
ToupTek AFW-L, 50mm Round, 3mm thick filters