Hi phani, thanks!
Yes, I was working at an effective focal length of 800mm, whereas you'll be working at 500mm, so the Sun will be almost half the size on the frame - but it'll still look good, and will give you plenty of room to capture the corona and also to accommodate the Sun moving across the frame more so than mine. I had to adjust my tripod every few seconds, and every time I worried I would nudge it too far and lose the Sun! You will still need to make adjustments regularly though. Remember to switch IS off if you're using a tripod.
Note, do not use an ND filter for solar or eclipse photography.
If you want to take images before or after totality to show the partial eclipse, you WILL NEED a special solar filter. Anything else will damage your equipment and your eyes.
As soon as totality begins though, you can remove the filter. All of the the photos above were taken without a filter. But the instant totality ends, you need to fit a filter or put a lens cap on.
During totality I would recommend taking a series of shots at slower and slower shutter speeds, starting at approx 1/100 at 100 ISO and reducing half or 1/3 of a stop at a time. So you could try:
1/100, 1/80, 1/60, 1/50, 1/40, 1/30, 1/25, 1/20, 1/15, 1/13, 1/10, 1/8, 1/6, 1/5, 1/4, 0.3, 0.5 and so on.
I would recommend trying to do this now with any subject, pausing for a couple of seconds between each shot to see how long it takes and to make sure NONE have camera shake. Obviously you need to make sure you can do it all in time during totality.
And please do save a few seconds to watch it with your eyes, because it is an amazing sight! If anything goes wrong with your equipment, just forget it and watch it instead. If you try and fix your gear, you will lose the moment.