I want to experiment taking photos in which the sun appears. I'm afraid of what might happen if I take one with a narrower angle (where sun would be bigger). Can the lens act as a magnifying glass and burn the CCD or CMOS sensor?
Under which circumstances (zoom, exposure, aperture, etc...), can the sensor be damaged by the sun?
Answer
Taking direct photos of the sun can destroy your camera, not to mention your eyes. It's exactly as you are afraid, the lens will act as a magnifier and multiply the suns intensity right on your cameras internals. What this effects can vary. Long exposures against the sun can cause permanent damage to your camera's sensor, but besides that, your camera's shutter curtains, and af sensors are also at risk when shooting right at the sun.
Now, taking photos of sunset and sunrises is okay, as is taking photos in direct sunlight (though this does require some finesse to get a good exposure), but pointing your lens right at the sun is not recommended (especially for long exposures).
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