can anyone tell me how to do a len flare effect in flash mx plz?
Do you mean a static image or the Ray of Light effect? There’s a tutorial here on kirupa for the latter - Ray Of Light Tute. Otherwise, if it’s a static image, you can import a graphic from Photoshop, or try and make one yourself using gradient fills of different shades (white and yellow work quite well).
oh thanx, found the len flare i want in www.flashkit.com 
