any way to see the lens contain any fungus or not?
This is wat i do, but i can be wrong. This is how i check a lens.
1) Inspect exterior of the lens (condition, signs of drop), note of any shaky parts especially.
2) Inspect the front and rear glass of the lens first.
3) Open the aperture to the largest (if that lens can do so) and hold the lens into a light source to see if it is clear.
4) Close the aperture to the smallest and make use of the contrast of the black colored blades to look for possible spots of fungus. Tilt it at various angles to see. Do the same to the other side (rear and front) of the lens. Check for suspicious things on the wall of the lens also.
5) Use a torchlight to help u. Small 1 bulb LED pocket lights are gd enough. Tilt the light at diff angles and u can see the scratches, dust and fungus easier.
6) Mount it on the camera, take a few shots at various aperture settings, etc. Review the image on the LCD and randomly zoom into some places to check for whatever u want.
if it contain fungus will it harm the camera itself?
If the fungus is on the exterior elements just clean it with a gd cloth and some lens solution. If it is not on the exposed area, then i don think it will harm the camera, as it will have a hard time going into ur camera then. Again, I can be wrong. This is just my opinion.
how to remove it?
If on outside just clean it. If inside, i recommend our dear friend nick fatigue. He's good. He got one of my fave cleaned in less than an hour. Taught me tips and tricks as well.
I am not sure if u know how to differentiate dust and fungus. Dust usually won't affect ur images. Fungus is the more problematic one as it can grow. They look something like a "halo" and some look like they have "mycelia" (like roots). My vocab is limited.
There are tons of reason why someone wanna sell something in the B&S. Some ppl can be lying as well, no surprise. Just take this as a lesson. Don't brood over it. Enjoy photography, that is the most impt thing. :thumbsup: