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Grey dots in view finder, help

briantilley

Paignton, UK
30235 posts

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"RE: Grey dots in view finder, help"

briantilley Gold Member Deep knowledge of bodies and lens; high level photography skills Donor Ribbon awarded for his support to the Fundraising Campaign 2014 Nikonian since 26th Jan 2003
Sun 08-Jul-12 09:23 AM

In a DSLR, the imaging sensor is located at the rear of the camera behind the reflex mirror and mechanical shutter. When you're looking through the viewfinder, you see the scene as projected onto a focusing screen above the mirror - the sensor is not in the light path at that point so it's not possible for spots on the sensor to be seen in the viewfinder. When you press the shutter, the mirror lifts (thus blocking the viewfinder instantaneously) and the shutter opens, exposing the sensor to the light.

Any spots you see in the viewfinder will be on either the mirror or the focusing screen (they are unlikely to be inside the prism housing if they moved when you used your blower).

Brian
Welsh Nikonian

A general, generic topic Grey dots in view finder, help [View all] , wgregww1 , Sat 07-Jul-12 05:41 PM
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