The GSO polarizing filter in the 1.25 "luminaire provides a dimmer filter, and if you purchase two filters, it allows you to adjust the transmission in the 50-1% range. Both a single filter and two combined 50% polarizing filters are used in all telescopes, also large ones, it allows for optimal transmission conditions, and also when you want to combine color or specialized filters (SkyGlow, Contrast Booster, Semi-APO ...) with a filter that reduces transmission.
The filter is screwed into 1.25 inch glasses equipped with a filter thread or equipped with filter thread sleeves, angular connectors, Barlow lens.
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