i think that's usually the case. you might be able to use a dedicated filter [link] that will do the job well enough (if i read the article correctly). A camera specifically calibrated for IR would in theory render better and more accurate results, but i personally do not have that rather expensive option to add to my kit. Would still like to try this someday, since i love the surreal effects it produces.
Views like these make me so jealous! Being in a place with a significant amount of light polution, I've never seen the stars as beautiful as these in the night sky.
how long was the exposure on this one?