This is the new Redcat 250mm f/4.9 lens
William Optics has launched a new Redcat 250mm f/4. 9 lens on Kickstarter. The lens can be used on Sony E-mount cameras too: From the beginning, the goal was to create the best possible design for an affordable, small, lightweight, and fast Apochromatic refractor for astrophotography needs. sonyalpharumors.com »