What if Nikon D90 viewfinder can see dust photos and dust lenses? No customer service!

Time = The gray seen in the viewfinder usually exists between the focusing screen or pentaprism and the focusing screen. These ashes are only seen in the viewfinder and will not exist in the photo. The pentaprism in the viewfinder of the D90 will not be grayed out, and only those who use the roof mirror like the D60 will be grayed out. There is no need to pay attention to the dust seen in the viewfinder if it is too big. I can't bear to blow on the focal screen again. Never wipe it. My 40-day focal screen will be scratched, leaving a big scratch ... Fortunately, I can change it myself ... The dust in the lens can't be seen in the viewfinder or photos, they will only affect the brightness and imaging quality of the lens. But it won't show spots. If the dust on the mirror is not very big, it won't be visible in the viewfinder. If there are spots on the photo, it should be just that the image sensor is stained with dust. To observe the dust environment on the image sensor, you can use the smallest aperture, such as f32, and you can see it after shooting in a bright place. You can test the dust removal function of the camera itself first. If dust or mechanical foundation does not support it, manual dust removal can be used. After locking the mirror, the mechanical bayonet opens downwards and is blown by air ... but it may blow in more dust ... so pay attention to whether the environment is clean enough. View original post >>