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.
Baader
Filters C-ERF energy guard filter 180mm, IR CUT, dielectrically coats
$ 1,760.00
ready for shipping in 1-2
weeks
Baader
Filters C-ERF energy guard filter 90mm, IR CUT, dielectrically coats
$ 482.00
ready for shipping in 1-2
weeks
Baader
Filters C-ERF energy guard filter 160mm, IR CUT, dielectrically coats
$ 1,190.00
ready for shipping in 1-2
weeks
Baader
Filters C-ERF energy guard filter 135mm, IR CUT, dielectrically coats
$ 960.00
ready for shipping in 1-2
weeks
Baader
Filters C-ERF energy guard filter 110mm, IR CUT, dielectrically coats
$ 600.00
ready for shipping in 1-2
weeks
Baader
Filters D-ERF 75mm energy rejection filter, IR blocking, dielectric coated
$ 334.00
ready for shipping in 1-2
weeks