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Finding sensor dirt with a pinhole lens
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PostPosted: Mon Aug 26, 2013 7:46 pm    Post subject: Finding sensor dirt with a pinhole lens Reply with quote

http://youtu.be/Hb6ljsoYNw0

All you need is a pinhole lens body cap, which is about $1 to make.


PostPosted: Mon Aug 26, 2013 10:25 pm    Post subject: Reply with quote

I use a normal lens, fully stopped down, pointing at the sky - cost $0


PostPosted: Mon Aug 26, 2013 10:38 pm    Post subject: Reply with quote

kds315* wrote:
I use a normal lens, fully stopped down, pointing at the sky - cost $0


+1, this is exactly what I do to find sensor dust.


PostPosted: Mon Aug 26, 2013 11:10 pm    Post subject: Reply with quote

koji wrote:
kds315* wrote:
I use a normal lens, fully stopped down, pointing at the sky - cost $0


+1, this is exactly what I do to find sensor dust.


I just find it when I'm not looking for it at f16


PostPosted: Tue Aug 27, 2013 2:19 pm    Post subject: Reply with quote

A lens stopped down to f16 and smaller will find most of the dirt, yes. I had my sensor cleaned to the point that no dust showed at f16. Then I checked again with the pinhole and found just as much dirt as I'd just cleaned off.