That's possible - but wouldn't the image still require multiple long exposures - say at least 20 or 30 seconds? If shooting multiple images that way, would the sensor still heat up? Do you know, Fred?
Astrophotograpy and Star Trackers
- Thread starter Moab Man
- Start date
That's possible - but wouldn't the image still require multiple long exposures - say at least 20 or 30 seconds? If shooting multiple images that way, would the sensor still heat up? Do you know, Fred?
TwistedThrottle
Senior Member
That's possible - but wouldn't the image still require multiple long exposures - say at least 20 or 30 seconds? If shooting multiple images that way, would the sensor still heat up? Do you know, Fred?
It is true that sensors will heat up if multiple long exposures are shot back to back. People who use a star tracker with with a computer aided auto aligners have the ability to shoot many minutes at a time back to back. Those are the ones who run into burning pixels out, hence the reason for cooled sensors on dedicated astro cameras, (the image is also cleaner when the sensor is cool). Shooting many 30 second shots don't really give a chance for the sensor to become critically hot unless your location is hot at night and then you could space your shots out a bit more or reduce the exposure a bit to allow the sensor time to cool before the next shot is taken. There is also a way to cancel out the hot pixels by taking many dark frames, (the same exposure time at the same focal length at the same temp) with the lens cap on after all your light frames are acquired. Doesn't fix dead pixels, just cancels them out.
Fred Kingston
Senior Member
A series of 20-30 sec. exposures shouldn't be outside the normal usage limits of a modern camera sensor. Those are, after all, regular settings...
Spottydumplings
Senior Member
Also don't forget the length of video that cameras can now take; that will also be heating the sensor. I know that the old D90 was limited to 5 minutes of video for that very reason but now roughly 30 minutes+.