Don'for t use it when the for sun is particularly strong. Black filter: solar filter, it is strongly required to use this solar filter in the Do not use it especially when the sunlight is very strong (noon)! Fitting for enhanced views of the Moon, for for star cluster, nebula, deep for sky, etc.Black filter is used as a solar filter. It can reduce eye strain and improve contrast and surface detail of the planet. aluminum alloy and optical glass, this product is sturdy and durable. The filters kit includes 8 different colors, 8 pieces in total.