DOUG66 Posted May 30, 2011 Share #21 Posted May 30, 2011 Advertisement (gone after registration) I have found that the best way of detecting dirt on a sensot is to photograph a grey sky at F22 with the lens focussed at 0.7m or its shortest distance with the shutter of the M8 set to auto. Search the image at a high magnification, the dirt will show up as sharp spots. Doug. Link to post Share on other sites More sharing options...
Advertisement Posted May 30, 2011 Posted May 30, 2011 Hi DOUG66, Take a look here dirty sensor?. I'm sure you'll find what you were looking for!
lct Posted May 30, 2011 Share #22 Posted May 30, 2011 Best way to catch a ccd* if you ask me. A sensor is never clean at f/22, even after a fresh cleaning. Dirts are only a problem when we see them at working apertures imho. *compulsive cleaning disorder Link to post Share on other sites More sharing options...
jevidon Posted June 16, 2011 Share #23 Posted June 16, 2011 Arctic Butterfly works very well. Use squeeze blower first and then use theButterfly. Link to post Share on other sites More sharing options...
biswasg Posted June 17, 2011 Share #24 Posted June 17, 2011 I have wondered about the physics involved in this phenomenon. While I can understand the visibility of the dust located in the path of light at the lens or outside the camera being affected by the aperture, have not figured out why the image of the dust on the sensor should be affected be the lens aperture. Link to post Share on other sites More sharing options...
mjh Posted June 17, 2011 Share #25 Posted June 17, 2011 The cone of light hitting a point on the sensor is small and slender when the aperture (the exit pupil to be exact) is small, but broader when the aperture is large. The outer rays of a broad cone may still manage to sneak past some dust particle while all the light rays of the slender cone get blocked. Link to post Share on other sites More sharing options...
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