Cleaning the focusing screen.

[tecboy]

Tweezers

Thanks.
What do you guys think of these? Visible Dust Focusing Screen Swab

 

[KmH]

Is there anything I can read about reflex mirror on the internet? How does it works?

You could look on Wikipedia and use an Internet search engine to discover other online resources.

Digital single-lens reflex camera - Wikipedia, the free encyclopedia

 

[Garbz]

Is there anything I can read about reflex mirror on the internet? How does it works?

The wikipedia page KmH linked to will give you half the story. Basically the mirror reflects light upwards to the viewfinder through a focusing screen. When you press the shutter it moves out of the way and the shutter goes off.

Here's an ultraslowmo:
https://www.youtube.com/watch?v=7Ovar4tjRSY&feature=fvwrel

Worth mentioning is the missing part of the information is that there's actually TWO mirrors. The main one you can see is semitransparent. Some light gets through this mirror and is reflected by a second mirror behind the main towards the BOTTOM of the camera. The bottom is where the autofocus system is installed.

 

[tecboy]

Is there anything I can read about reflex mirror on the internet? How does it works?

The wikipedia page KmH linked to will give you half the story. Basically the mirror reflects light upwards to the viewfinder through a focusing screen. When you press the shutter it moves out of the way and the shutter goes off.

Here's an ultraslowmo:
https://www.youtube.com/watch?v=7Ovar4tjRSY&feature=fvwrel

Worth mentioning is the missing part of the information is that there's actually TWO mirrors. The main one you can see is semitransparent. Some light gets through this mirror and is reflected by a second mirror behind the main towards the BOTTOM of the camera. The bottom is where the autofocus system is installed.

I always wonder what the 2 mirrors are for. Thanks