The black stain is likely on the mirror, prism or the lens (if you only see it after lens is mounted). Depending on the size, and your comfort level, you might need to get it cleaned. If it doesn't affect the pictures, you might want to live with it.
Pls don't blow onto the sensor, more dust will accumulate and specks of black spots will appear in the pictures taken.
Does it appear in the pictures?
If yes = sensor cleaning
If no = general cleaning (prism, mirror)
You can look into the mirror, etc to locate the dirt. If it's on the mirror, it's easy to clean. Anywhere else would be more difficult. Do you know how to remove the focusing screen? Do you have a strong blower?
nope.. in tis case, i think i better bring to CSC to take alook? safer rather than i DIY?? too heartpain if i did something wrong...
Just get CSC to clean it with cost if the stain very annoying to you...
Dust is everywhere so soon or later it will come back again.... :bsmilie:
I agree.
I also had the same prob as you last time.
I went to 2nd hand camera shops, they told me if it's under warranty, then bring it to CSC.