Photographing Venus with a phone through a telescope I took a picture of Venus through my telescope (Celestron Astromaster 130eq) using a 10mm lens with a Barlow lens.

The picture isn't really good since I took it with my phone and I still don't have a camera. 

Also, it isn't a matter of focus since I fiddled a lot with it.

I don't know what to do to clear the image and reduce the brightness. Should I use a filter? and which one?
Phone cameras just aren't designed to take good photographs of astronomical objects. The sensor is too small and the configuration options (like exposure time) are minimal.

For astronomical photography, a better option is to use (the body of) a DSLR (or the analog version); the lens is provided by your telescope. Another option is a specialized CCD camera.