What size screw-in filters do the lenses take?
Last Updated at Apr 29 by admin
The only RED lens with a viable front filter thread is the 18-50, which uses a 72mm diameter filter (inset in front lens barrel). The 50-150 and 300 do not have standard filter threads. The 300 does accept 43mm filters in a filter holder in the rear of the lens. The front diameter (for mounting pro shades or matte boxes) for the 18-50 and 50-150 is 114mm. The front diameter of the 300mm is 117mm.