Item description: The Lensbaby Double Glass Optic was the standard look for the Lensbaby Muse. It has also been available individually since its introduction. It has a maximum aperture of F/2, which can be departed via a magnetic disc system and creates an image circle that is large enough for use with full -frame cameras. As the name suggests, Double Glass Optic is a lens with two elements and a focal length of 50 mm. With maximum aperture, it creates a very small sharp focus circuit that quickly turns into blurring. By inserting the optional panel disc f/2.8 or f/4, the sharpness area and the overall picture contrast are improved. Depending on which Lensbaby lens you use it, you can tend the lens to change this sweet spot of sharpness. All prices contain the statutory sales tax, but du.