Lens filters are attached or screwed onto the lens of the optic, on the side facing the object to be observed.
Especially in the case of solar filters, no damaging radiation is allowed into the optic from the outset. This protects the optic and is the safest method of reducing light.
Most lens filters can also be used for photographic lenses.

Optolong
Filters L-Pro Filter 77mm
RRP:
$ 376.00
Our price:
$ 301.00
ready for shipping in 24
h
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Optolong
Filters Clear Sky Filter 82mm
$ 230.00
ready for shipping in 3-5
weeks

Optolong
Filters Clear Sky Filter 77mm
$ 177.00
ready for shipping in 3-5
weeks