OPTOLONG 3nm NARROWBAND SHO FILTER SET Size:2" This 20 kg counterweight is

This 20 kg counterweight is exclusively designed for GM3000 mounts

13 kg Dimensions - Upper assembly 345 x 200 mm

AZ-EQ6 Pro/GT and EQ6-R Pro mounts

Optical design Ritchey-Chrétien

This 15mm M68 extension tube features a male M68 x 1 thread on one end and a female M68 x 1 thread on the other

OPTOLONG 3nm NARROWBAND SHO FILTER SET Size:2" This 20 kg counterweight isThe NEW Optolong 3nm H Alpha, Oxygen III and Sulphur II narrow band filters boost the contrast of emission nebulae and supernova remnants for professional results, even under a bright sky affected by light pollution. This filter is used in combination with the OIII and SII filter to compose a narrowband colour image. The 3nm band pass is only 1% of the entire visible spectrum, increasing the signal to noise ratio and delivering high contrast images