Thanks Peter and Jakov. As I get more familiar with StarTraX which works very well for a free software! I will probably figure my way around it. For now I just fill the gaps in Ps after stacking, After all, I have nothing else to do, right! LOL
What I have learnt is that with digital, many shorter (30 second) exposures stacked are a better method than a single long (1 hour?) exposure. It may reduce the tendency for the sensor getting too hot, therefore reducing the noise, it allows you to cut out interference from unwanted light sources and you can vary the length of the trails by increasing or reducing the number of exposures in the stack. It stops you having all the eggs in one basket and definitely gives you more control.
