Lately I myself perceived the presence of dark spot on several photographic cliches realized that I had with my SLR I made myself in a photographic store it s turned out that these spots were due to dust on the presence of my DSLR sensor and is my advise to clean this one for a price of 30E after a search on the net (forum and website specialized) I have order this kit: the pear is convenient and power allowed me to come to the end of the dust with a can measure in the job the optic paper cleans the front optical targets I haven not currently use optical liquid
ALTHOUGH it is the price of what the results are perfect kit I recommend more particularly the pear and the optical paper