I've had the 500PF since its introduction. At the time of purchase I had a choice between a used (but unused) 500mm f/4G, new Sigma 500 f/4 S, and the 500PF. At the time of purchase I had the 200-400mm f/4G and 300PF, so I thought I'd buy the new Nikon for its low weight and portability. As many have stated, it is much more than a lightweight lens. It has the potential to revolutionize the way you take pictures because of its diminutive size. I am a traditionalist and have followed the "John Shaw School of Photography." For those too new to the field of Nature and Wildlife, John Shaw was a huge advocate of shoot it from a tripod ALWAYS. As one who has spent most of his photographic life shooting with a large and bulky tripod, it took the better part of a year to liberate myself from my 3-legged friend. While I still shoot much of my work (85%) with a tripod (even my PF lenses), I am now quick to release the lens from its bondage and shoot handheld when the situation requires it.
Optically, I find it as sharp as the 500 f/4G that others have mentioned, and too close to call when compared to the 500E lens. It's primary weakness is its depth of field. When the subject to lens is close and background distance is significant, it is no big deal... when the subject to lens distance is moderate and background to subject is close, you will miss the benefits of an f/4 maximum aperture. Finally, while the D500 is a great body to pair with the lens, the DX crop serves magnify the bokeh dilemma that I just described.
Someone mentioned strange bokeh... this is something that I rarely see (only once) and should not be a reason disregard the lens. If you shoot straight into the sun, you will see the fresnel lens bokeh, but the 500PF is much better at handling this artifact than is the 300PF (I have one of these too). The bokeh is smooth and pleasing so long as the background is not cluttered
I am not a bird photographer, but this lens has allowed me the liberty to chase birds while photographing other (mostly mammalian) subjects... samples below
regards,
bruce
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