how to clean af point?

is there someone knows how to clean the af point(i dnt know the name)? cause i think i have dust in it. i can see it by the viewfinder.

The etched point you can see in the viewfinder is not a physical point. It is just an indication of where the AF point is. The dust would be on your focus screen, Im not sure how to clean it, but be very careful. It wont affect your pictures.

Sinkrate wrote in post #4309845
The etched point you can see in the viewfinder is not a physical point. It is just an indication of where the AF point is. The dust would be on your focus screen, Im not sure how to clean it, but be very careful. It wont affect your pictures.

have you ever clean yours?

thrash_273 wrote in post #4309861
have you ever clean yours?

Never, the dust does not bother me. You will get used to it.

doesn't it affects the quality?

Do. Not. Touch. Your. Viewfinder.

You can cause irreparable damage to the very, very fragile mirror if you're not careful. If you have a rocket blower, gently, GENTLY, blow in their to try to dislodge the dust.

If that doesn't work, and the dust really, really bothers you, send it to a certified camera cleaning place.

thrash_273 wrote in post #4309924
doesn't it affects the quality?

No. Any dust in your viewfinder will not be visible on your shot. SLRs work by moving the mirror/viewfinder out of the way when you take a shot. Thus, dust on the AF point marker has no real impact on the AF of the shot.

AirBrontosaurus wrote in post #4309925
Do. Not. Touch. Your. Viewfinder.

You can cause irreparable damage to the very, very fragile mirror if you're not careful. If you have a rocket blower, gently, GENTLY, blow in their to try to dislodge the dust.

If that doesn't work, and the dust really, really bothers you, send it to a certified camera cleaning place.

i almost touch it. i did try to rocket blow but did'nt work. you guys are awesome.

AirBrontosaurus wrote in post #4309925
Do. Not. Touch. Your. Viewfinder.

You can cause irreparable damage to the very, very fragile mirror if you're not careful. If you have a rocket blower, gently, GENTLY, blow in their to try to dislodge the dust.

If that doesn't work, and the dust really, really bothers you, send it to a certified camera cleaning place.

AirBrontosaurus wrote in post #4309933
No. Any dust in your viewfinder will not be visible on your shot. SLRs work by moving the mirror/viewfinder out of the way when you take a shot. Thus, dust on the AF point marker has no real impact on the AF of the shot.

AirB is right - don't touch your mirror or your focusing screen (what you're calling the viewfinder). If you open your camera and look inside, you'll see a slanted mirror that directs light up into the viewfinder (which consist of a focusing screen, a pentaprism or pentamirror) and an eyepiece). Above the mirror you'll be able to see a flat piece of what looks like ground glass (this is the focusing screen).

If there is dust on your mirror, it won't be in focus and you won't be able to see it, but you will be able to see dust on the focusing screen, so this is likely what is dirty on your camera. These screens are, however, fairly fragile and easily marred, so don't touch or wipe them. You can gently blow them off with a rocket blower or bulb blower, but if the dust is on the upper side of the screen, it may not come off. In that case, you'll just need to live with it.

The mirror, is also fragile. It is front silvered, meaning the very thin reflective coating is on the front of the mirror, not the back. Touching that could damage the coating. This is important because this mirror passes some of the light through it to the focusing sub-mirrors.

Additionally, as AirB indicated, when you take a photo, the mirror lifts up against the focusing screen sealing light entering the camera from the eyepiece, then the shutter opens and the digital sensor is exposed. So there is no way that dust on the mirror of focusing screen will affect your image.

Mark

Mark_Cohran wrote in post #4310070
AirB is right - don't touch your mirror or your focusing screen (what you're calling the viewfinder). If you open your camera and look inside, you'll see a slanted mirror that directs light up into the viewfinder (which consist of a focusing screen, a pentaprism or pentamirror) and an eyepiece). Above the mirror you'll be able to see a flat piece of what looks like ground glass (this is the focusing screen).

If there is dust on your mirror, it won't be in focus and you won't be able to see it, but you will be able to see dust on the focusing screen, so this is likely what is dirty on your camera. These screens are, however, fairly fragile and easily marred, so don't touch or wipe them. You can gently blow them off with a rocket blower or bulb blower, but if the dust is on the upper side of the screen, it may not come off. In that case, you'll just need to live with it.

The mirror, is also fragile. It is front silvered, meaning the very thin reflective coating is on the front of the mirror, not the back. Touching that could damage the coating. This is important because this mirror passes some of the light through it to the focusing sub-mirrors.

Additionally, as AirB indicated, when you take a photo, the mirror lifts up against the focusing screen sealing light entering the camera from the eyepiece, then the shutter opens and the digital sensor is exposed. So there is no way that dust on the mirror of focusing screen will affect your image.

Mark

whewwww....... almost. really.