OPTOLONG H-ALPHA 7nm NARROWBAND FILTER Size:36mm In case of remote observatories

In case of remote observatories

Set of five fine adjustment spacer rings (optical thickness of 0

244 mm diameter

The SkyWatcher 300 Quattro is a Newtonian telescope with the super fast focal ratio of f/4

PL3304209 + PL3304209 + PL3304201 + PL3304200

OPTOLONG H-ALPHA 7nm NARROWBAND FILTER Size:36mm In case of remote observatoriesThe Optolong H Alpha 7nm narrowband filter boosts 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 7nm band pass is only 2% of the entire visible spectrum, increasing the signal to noise ratio and delivering high contrast images and extremely dark backgrounds.