You asked

Is the nikon af s 300mm f 4e pf ed vr weather sealed?

Here is what the site says about that.

From Nikon AF-S 300mm f/4E PF ED VR: Nikon AF-S 300mm f/4E PF ED VR: A prime lens by Nikon for Full frame cameras, 300mm f/4. A Phase Fresnel element makes this a small, light 300mm. Specs - Maker: Nikon - Focal length: 300mm (prime) - Maximum aperture: f/4 - Made for: Full frame sensors - Mounts: Nikon F - Stabilised: yes - Autofocus: yes What it frames like - On full frame (Nikon F): as marked, 300mm. - On APS-C (Nikon F): like 450mm ...

From Landscape: What matters: - Resolution and dynamic range. Landscapes are often printed big and include bright skies and dark foregrounds in one frame. A sensor with a lot of dynamic range keeps detail in both. Full-frame and high-resolution bodies shine here, but any modern sensor does well at base ISO. - Weather sealing. You'll be out in wind, spray and drizzle at dawn. A sealed body and lens survive it. - A tilting ...

Quoted from this site's pages.

From these pages