Canon's Premium RF Lenses Along with the R cameras, we received samples of two of Canon's premium RF lenses made for the EOS R cameras and ideal for astrophotography. The RF 15-to-35 mm f/2.8 L This new zoom lens has a focal length range and speed perfect for nightscape photography. At 15 mm and wide-open at f/2.8, the lens was clean across the frame with low aberrations at the corners. Off-axis aberrations became more pronounced at the longer focal lengths but were still well-controlled at 35 mm. While vignetting was significant, that can be fixed in RAW processing with Lens Correction functions. The RF 85 mm f/1.2 L Razor-sharp on-axis, even wide open, this short telephoto showed very low off-axis aberrations even at f/1.2, allowing it to grab lots of nebulosity in short exposures and at low ISO speeds. This test shot is with the stock EOS R camera. This is one of the best 85-mm lenses on the market, providing a fine focal length for Milky Way star fields. RF 15-to35-mm lens at 15 mm, f/2.8. RF 15-to35-mm lens at 35 mm, f/2.8. RF 85-mm lens at f/1.4. sk yandtelescope.org * APRIL 2 02 0 67http://www.skyandtelescope.org