FLI Research Grade 65mm Square UBVRI Filter Set
FLI's Research Grade 65mm Square H-Alpha Filter's are of the highest quality, made to the highest standards with the finest production methods. Each and every one is coated in a durable AR coating on both of the filter's surfaces, ensuring that they are highly durable to scratches and dents- with a scratch/dig resistance rating of 60/40. These coatings are of course applied with extreme, exacting precision to make sure they do not impair the filter's performance of their primary intended function. Transmitted wavefront is better than .25 wave/inch at 635nm. Research grade filters are 5 +/- 0.05mm, par focal +/- 0.2mm, (filters start par focal +/- 0.1mm per recipe). Parfocal to f/4.5.
This set contains five filters meant to be used layered together to create a combination of false color and color images. The included filters are as follows; Ultraviolet, Blue, Visual, Red, and Infared. This kind of filter setup is often used as an alternative to the more traditional LGRB filter set, producing full color images of similar quality, but with a focus that brings out different elements more, and other's less- enhancing different wavelengths of the spectrum from the LRGB set. The UBVRI set mixes Narrowband and Broadband filters. Unmounted, this filter will fit into filter wheels made to accept 65mm filters.