When you look through the viewfinder of a DSLR, you always see a certain amount of dust. This is inevitable and quite natural. This is dust on the mirror and it will not affect the photo in any way. The mirror, of course, can be cleaned, but the silver coating on it is quite sensitive, so if you really take it on, then only understand the technique well. But what you should not do is to try to clean the mirror with a pear – in this way you can drive dust from the mirror onto the matrix, but in this case, the photo will already be at risk.
As for lovers of night photography and https://www.artlook.us/service/elopement-wedding-photography/, users of telescopes, etc. – try not to examine the lenses and optics for contamination with colored lights, as not everything will be displayed at all.
One last thing to note is that you can clean both the lens and the camera with a tissue and a special cleaner. The digital contacts that connect the lens and camera need to be cleaned occasionally too. Do not forget that you do not need to use the same napkin that is used to work with glass, since very small metal particles can also get on the fabric and subsequently scratch the coating.