Optolong LRGB 1.25 "is a set of four professional astrophotographic filters dedicated to cooperation with monochrome cameras.

All filters are characterized by high efficiency, exceeding 95%, in the maximum transmission band, and thanks to the use of a very good glass substrate and covering the surface with a full multilayer coating, the resulting image is extremely vivid and contrasting.

The separation of the transmission maximums for the G and R filters was selected in such a way as to effectively eliminate the signal coming from the spectral lines of sodium lamps, which constitute the main part of the light pollution.

The most important features of Optolong LRGB 1.25 "filters

• substrate made of high quality optical glass
• very good elimination of the main emission line of sodium lamps (589 nm)
• scratch-resistant multi-layer anti-reflective coating

Technical parameters

• filter type: bandpass filter
• filter diameter: 1.25 "
• filter thickness: 2 mm
• filter material: optical glass
• maximum transmission:> 95%
• type of coating: full multilayer coating (FMC)
• RGB channels weight: about 1: 1: 1
• frame material: black anodised aluminum

Elements of the set

• Optolong LRGB 1.25 "B filter (blue, OIII)
• Optolong LRGB filter 1.25 "G (green, O III)
• Optolong LRGB 1.25 "R filter (red, Hα)
• Optolong LRGB 1.25 "L filter (luminance, UV / IR cut)