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
$ 385.00
ready for shipping in 24
h
Optolong
Filters Clear Sky Filter 82mm
$ 268.00
ready for shipping in 24
h
Baader
Filters D-ERF 75mm energy rejection filter, IR blocking, dielectric coated
$ 368.00
ready for shipping in 1-2
weeks
Baader
Filters C-ERF energy guard filter 180mm, IR CUT, dielectrically coats
$ 1,940.00
ready for shipping in 24
h
Baader
Filters C-ERF energy guard filter 90mm, IR CUT, dielectrically coats
$ 540.00
ready for shipping in 1-2
weeks
Baader
Filters C-ERF energy guard filter 160mm, IR CUT, dielectrically coats
$ 1,310.00
ready for shipping in 1-2
weeks
Baader
Filters C-ERF energy guard filter 135mm, IR CUT, dielectrically coats
$ 1,060.00
ready for shipping in 1-2
weeks
Baader
Filters C-ERF energy guard filter 110mm, IR CUT, dielectrically coats
$ 660.00
ready for shipping in 1-2
weeks
Optolong
Filters Clear Sky Filter 77mm
$ 221.00
Product can be shipped as of 15.05.2026
Gerd Neumann jr.
ND 0.9 neutral density filter for 100mm and 160mm Aurora flat-field panels
$ 17.90
ready for shipping in 24
h
Gerd Neumann jr.
ND 0.6 neutral density filter for 100mm and 160mm Aurora flat-field panels
$ 18.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND 1.2 neutral density filter for 220mm Aurora flat-field panel
$ 23.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND 0.6 neutral density filter for 315mm Aurora flat-field panel
$ 31.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND 1.2 neutral density filter for 100mm and 160mm Aurora flat-field panels
$ 17.90
ready for shipping in 24
h
Gerd Neumann jr.
ND 0.6 neutral density filter for 220mm Aurora flat-field panel
$ 23.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND 0.9 neutral density filter for 220mm Aurora flat-field panel
$ 23.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND1.2 neutral density filter for 420mm Aurora flat-field panel
$ 36.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND 0.9 neutral density filter for 315mm Aurora flat-field panel
$ 27.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
Neutral density filter ND0.9 for 750mm Aurora flat-field fluorescent lamp
$ 89.00
ready for shipping in 3-5
weeks
Gerd Neumann jr.
Neutral density filter ND0.6 for 750mm Aurora Flatfield light emitting film
$ 89.00
ready for shipping in 3-5
weeks
Gerd Neumann jr.
Neutral density filters ND1.2 for 750mm Aurora flat-field light emitting film
$ 89.00
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND1.2 neutral density filter for 315mm Aurora flat-field panel
$ 31.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND0.9 neutral density filter for 420mm Aurora flat-field panel
$ 36.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
ND0.6 neutral density filter for 420mm Aurora flat-field panel
$ 36.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
Neutral density filter ND0.9 for 590mm Aurora flat-field fluorescent lamp
$ 47.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
Neutral density filter ND0.6 for 590mm Aurora flat-field light emitting film
$ 47.90
ready for shipping in 3-5
weeks
Gerd Neumann jr.
Neutral density filter ND1.2 for 590mm Aurora flatfield light emitting diode
$ 47.90
ready for shipping in 3-5
weeks