OPTOLONG L-Synergy FILTER GEOPTIK25 the symmetrical model lacks the

the symmetrical model lacks the mechanical shutter

The maximum transmission of the Sulphur II line (671

at 113mm long and 240 grams

Optical length 15 - 18 mm Clear aperture 38 mm Outer diameter 56 mm Connection side A

5 kg (head) + 5

OPTOLONG L-Synergy FILTER GEOPTIK25 the symmetrical model lacks theThe Optolong L Synergy filter is a light pollution dual band filter designed to drastically reduce the effect of light pollution. Its two passing bands isolate the nebulae emissions in OIII (green blue) and SII (red). Differently from the Optolong L eNhance filter which is a tri band (transmits H beta, H Alpha, and OIII), the L Synergy filter has a narrower band pass of 7nm for each band. This filter is designed for modified DSLR's and astronomical