There are well over a hundred eagles there now and the daily activity depends on the wind and water flow. Yesterday (Friday) there was much activity with many opportunities to see eagles fishing and fighting for the catch. Unfortunately a lot of the action takes place too far from the viewing area to get good shots but there was enough close by for an exciting day.

20240322_Juvenile Eagle_Conowingo Dam_2586pr4 by Elliott Cobin, on Flickr

20240322_Juvenile Eagle_Conowingo Dam_2187pr4 by Elliott Cobin, on Flickr

I want that fish!
20240322_Juvenile Eagle_Conowingo Dam_1962pr4 by Elliott Cobin, on Flickr

20240322_Juvenile Eagle Catch Sequence_Conowingo Dam by Elliott Cobin, on Flickr

20240322_Juvenile Eagle_Conowingo Dam_1838pr4 by Elliott Cobin, on Flickr

20240322_Juvenile Eagle_Conowingo Dam_1819pr4 by Elliott Cobin, on Flickr

20240322_Eagle_Conowingo Dam_2327pr4 by Elliott Cobin, on Flickr

20240322_Eagle_Conowingo Dam_2068pr4 by Elliott Cobin, on Flickr

I have the OM-1 & Olympus 300mm f4 with both 1.4 & 2.0 TC’s, original 100-400mm Panasonic, Panasonic G9 & G9 II and many Pano Leica and Oly Pro lenses. I also have a Nikon D500 & Nikon 500mm PF f5.6 lens. I came to M43 for a travel camera system and I am so glad I did. It is much lighter than my past D750’s and full frame gear and I would not want to carry that weight again at age 79. But I also like to photograph birds, wildlife and bugs and the I can’t decide if I like the DSLR Nikon or OM-1 kit better despite all the mirrorless advantages and great stabilization of the Oly. You would not be unhappy with the Oly kit but you might want to try a Nikon 500mm PF lens on your D500 before changing or getting a new system as it weighs about 85 ozs and balances very well vs 73 ozs & 77 with the TC 1.4 for the Oly kit and the image quality is hard to beat. You can get the 500 PF for $2000 at MPB. I didn’t go with the Z8 or 9 because I wanted less weight. You can spend a lot of money changing to M43 system but at my age, for what I do it was the correct choice, I just can’t let go of the 500 PF yet. Good luck!

Sorry I was actually asking Jack who posted the strength's of that lens. You could make a very lightweight Nikon lens combo by buying a used 300mm PF lens which is about half the weight of the OM 300mm. And add a TC to that. It is quite a bit lighter than the Sigma 150-600mm. It is quite a change to go from a zoom to a prime lens, it might be good to try out a prime and see if you like it. Also the 300mm f/4 is great for low light photography (on your D7200 and D500) the 300mm f/4 will of course be 450mm. Do you know what focal length you use most? If 500-600mm, you might want to get the 1.4TC.
PS. A professional photographer can get great pics with any lens/camera.