What lens filters could I use to shoot the stars and the clear blue night sky?

Because I kept getting these purple like night sky, do I need to switch the white balance or should I buy a blue blue permissive filter or a red restrictive one?What lens filters could I use to shoot the stars and the clear blue night sky?
The purple light could be due to artificial lighting (are you near a city?) or your camera being sensitive to infrared. What I do when shooting the night sky, use a low magnification shot of the sky to set the custom white balance.What lens filters could I use to shoot the stars and the clear blue night sky?
The purple light cannot be avoided unless and until you correct for it in post processing





Since you seem to be serious about astrophotography, with- out having said so, I suggest you go thru this web site:


http://www.astropix.com/HTML/I_ASTROP/TO鈥?/a>





Hope that helps