I've shot many thousands of pan shots of Indy cars, sprint cars and midgets. Also I've shot panning shots of eagles, Ospreys, Cormorants and Killdeer. They require wildly different shutter speeds according to available light. Shooting sprint race in November with dark skys at F:4.5 @1/1000 at 400 ASA is different from shooting a flying Osprey or eagle where I would be at F:8 @ 1/1600 or 1/2500 at 1250 ISO. The attached shot was at 1/125 or 1/250. I used a Nikkor 180mm F:2.8. I focused on the wall directly in front of me and shot at F:11. I held the camera and panned until I was facing the wall only then did I fire the camera. In the second shot I was shooting a Nikon F2 with the 180mmF;2.8 and aperture of F:8 at 1/2000. The first shot I waited until the car reached my focus point and the second shot I had to follow focus.

Panning race cars is a high ISO is requirement. For 20 years I shot USAC sprinters with Kodak Tri-x ASA 400. I even push processed it at 1600 ASA. Bright sun and lower aperture (F:8 or F:11) Iso around 100 and higher shutter. Its all variable with existing weather condition. I've shot wide open at maximum aperture of F:4.5. ISO 400 Tri-x. Go out to a busy street and practice panning on passing cars at different shutter speeds.

Your shutter speed is too low. You should have used 1/250 or 1/320. When I shoot USAC sprint cars I used 1/1000 and Nostalgia Gasser drags I'm using 1/320.

I own the 600mmF:G VR also. I bought a baby buggy to carry the lens. Where I live it is all flat so I can walk miles pushing my runner type baby buggy. It holds lens, tripod, flash unit, extra 200-500len/camera and a small cooler. I've adapted my big golf umbrella to the buggy this year.

I have added two new sections to the previous PDF

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Its east of Toledo, Ohio on Route 2. The best times (depending on weather) mid April to 3rd week in May. If you come bring some cold weather gear as well as rain gear for your camera and yourself. I live in Toledo and its only a 30 miles drive for me.

Here are a few images that I got this year at Magee Marsh and something I wrote to help other to get more wall hangers in 2020, Just click (download) and read the 8 pages about setting up the camera and flash>

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I just downloaded the PDF into the photo gallery section but it does not show there. Why isn't this easier to accomplish?

I just downloaded the pdf but were did it go?

How do I get to "Birds in Flight" section?

I have created a article covering warbler photography. I go over the camera and strobe settings, showing examples and how I set up the camera and strobe. I've saved it in PDF format. So is there a place on this site for something like this?

Since climate change has ruined any chance of shooting shore birds this fall. We are 10" more rain this year than last year at this same time. So I drove 45 miles to a nostalgia gasser drag racing. I like the AMC pacer with a big chevy engine.

The Nikon 1.7 tele extender has a rather spotty reputation for sharpness. The 1.4 EII is quite good. With your 55~300 it is doubtful that either would autofocus because of your variable aperture lens, but it should focus manually. No Nikon extender will not fit on any Sigma lens and only Kenko extenders will work for you. But put a 2x on you 55~300 and you will be manual focusing and the variable aperture moving from 55mm to 100mm your lens will be closing down. Your camera needs to be able to focus at F:8 in order to use a 1.4EII extender.

You can download for free Nikon Transfer 2. I have used this since I went full Nikon digital in 2004. Also when you set up your presets thru the camera menus and shoot raw Transfer 2 applies those presets directly to the raw image.

I use a Kirk Enterprises G-1 gimbal. It holds my 600mm F:4G VR beautifully however it cost $625.00.