Thank you

Higher ISO will allow you to select a faster shutter speed.

Example
iso = 100 shutter speed 1/60

iso = 200 your shutter speed will be 1/125

iso = 400 your shutter speed will be 1/250 and so on.
There is a price to pay with your image appearing more noisy.

Thank you

I use a Nikon D2X and for thes pictures the Nikkor 70 200 f2.8

I seriously love both! What shutter speeds were you using out of interest? I love the frozen in time look but also the more 'alive' look of the slower ones, fantastic!

Was it all cam in hand or were you using a tripod?

Thank you.

To freeze the action you need at least 1/800 (depends on the speed). Picture no. 5 it was 1/1500.

For the last picture it was 1/25. That is very slow. Normally 1/60 will do. (for running dogs)

It's the "panning" technique.

Here you can read more

In hand but you can use a tripod.

WOW WOW WOW!!!! I need to get me a new camera ... and some lessons on how to use it!!! Both these sets of pictures are amazing!!

I say fast, but i do like the last picture

what fantastic pictures!

Brilliant pics! I like the fast ones the best