by ʇolɐǝz ǝɥʇ qoq

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Could you please explain why I am getting white semi-transparent dots for night photography with flash on?

enter image description here

Original image here.

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Are you using the flash? If so, see Why does using flash sometimes create these white spots in the photo? – mattdm Apr 27 '12 at 12:34
That is dust. . – dpollitt Apr 27 '12 at 13:31
Your room is haunted: they're ghosts, spirits of the dead, etc. At least, that's what they told me on one of those ghostwalk tours near a cemetery. The guide asked the tour group to take pictures of the empty cemetery, and marveled at all the ghosts and spirits that appeared on the group's P&S cameras. Many people were amazed. – cjc Apr 28 '12 at 14:17
OMG, that's too funny cjc! – Paul Cezanne Feb 23 '13 at 0:20

Looks like there was some dust or watter droplets or whatever in the air and that they reflect the flash light. The effect is not very present but as your background is black you can see them. Furtehrmore as they are out of focus they appear as disc rather than dot (in fact you got nice bokeh)

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To me it looks like a dirty lens?

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You won't see the dirt on a lens like that, even at f/32. I mean, if you can't see the scratches from the lens in this image.... – nwcs Apr 27 '12 at 14:59
@nwcs but there are no light sources in the image posted on that lensrentals blog post. Take a picture of a streetlight at night with the same lens and you will definitely see the cracks (they'd act like a star filter in front of the lens). Sprinkle a few water droplets on your lens and take some pictures of bright things, and you'll see the water droplets, like this water spray on my lens: – drewbenn Apr 27 '12 at 17:20
You're not seeing the dirt (or in this case, most likely fingerprints). You're seeing high angle light that is refracted by the skin oil on the lens' surface. – Michael Clark Feb 23 '13 at 0:08

Fingerprints on the front lens (especially of a point and shoot) look exactly like this photo. The light from the flash bouncing back from the perimeter of the lens at high angles will emphasize them. You are not actually seeing the oil from the print itself, you are seeing the high angle light refracted by the shape of the oil on top of the lens. Since this light is grossly out of focus, the points look larger due to bokeh. The brighter the light, the larger the "spot".

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It certainly looks like dust in the air - one other thing to check is that your sensor is clean - you can buy kits to clean the sensor from probably all camera shops.


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