ExclusiveOn The Trail With a Nikon 300mm f/4 My Blog TrueToad - July 9, 2015 Its been a full two weeks and I now have been able to get out on the trail with this jewel of a lens - the Nikkor 300mm f/4 Phase Fresnel lens. A better 200mm in every way. This week I take this lens out on a spin through the wild and put it to the test in the outdoor environment