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Star Photography One on One
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<blockquote data-quote="Wahugg" data-source="post: 133910" data-attributes="member: 10685"><p>I don't think the 15 second interval in between shots would be a good idea. It could cause empty spots on the final picture so the the star streaks might look like mores code.</p><p></p><p>I personally think the sensor over heating thing is blown out of proportion. For single long exposures, such as 10 minutes or more, then yes a couple of pixels could turn 'hot'. This hot is not temperature hot, but just a term for describing noise. The longer a shot, the more likely noise can become apparent. Most of the time, we see noise as graininess since most shots we take are less then 30 seconds. However when our exposure time exceeds 5, 10, and sometimes even 15 minutes, then a pixel or two can have so much noise, that it will show a completely different color such as red, blue, white, or green. That's a hot pixel. These 'hot' pixels are not apparent on most camera screens or even computer screens, but if you were to zoom in on the picture, then you could see this single red dot, which is just a hot pixel. It won't be there the next picture even if you take it right away. There's no point in waiting 15 seconds for the sensor to cool down, as there is literally nothing to cool down.</p><p></p><p>-Wahugg</p><p></p><p>Edit: Just for the hell of it, I put my D5100 on bulb mode for the past 5 minutes and with a laser gun I took the temperature before and after. There was a .12 degree Fahrenheit temperature difference on the sensor from the beginning to the end of the shot. (63.24F to 63.36F) So your sensor is perfectly safe from heat.</p><p></p><p>And here is a time lapse that I did a while back. The clouds ruined it, but for our purposes it's a great example. 30 second exposures with NO down time in between for 576 pictures. That's almost 288 minutes of exposure! (minus the half a second it takes for the shutter to reset). And with all that sensor activity, there is no visible hot pixels, so your sensor will be safe with no down time in-between shots. </p><p></p><p>Make sure to watch in HD!!</p><p></p><p>[MEDIA=youtube]ehgqAsSBby</p><p>k[/MEDIA]</p></blockquote><p></p>
[QUOTE="Wahugg, post: 133910, member: 10685"] I don't think the 15 second interval in between shots would be a good idea. It could cause empty spots on the final picture so the the star streaks might look like mores code. I personally think the sensor over heating thing is blown out of proportion. For single long exposures, such as 10 minutes or more, then yes a couple of pixels could turn 'hot'. This hot is not temperature hot, but just a term for describing noise. The longer a shot, the more likely noise can become apparent. Most of the time, we see noise as graininess since most shots we take are less then 30 seconds. However when our exposure time exceeds 5, 10, and sometimes even 15 minutes, then a pixel or two can have so much noise, that it will show a completely different color such as red, blue, white, or green. That's a hot pixel. These 'hot' pixels are not apparent on most camera screens or even computer screens, but if you were to zoom in on the picture, then you could see this single red dot, which is just a hot pixel. It won't be there the next picture even if you take it right away. There's no point in waiting 15 seconds for the sensor to cool down, as there is literally nothing to cool down. -Wahugg Edit: Just for the hell of it, I put my D5100 on bulb mode for the past 5 minutes and with a laser gun I took the temperature before and after. There was a .12 degree Fahrenheit temperature difference on the sensor from the beginning to the end of the shot. (63.24F to 63.36F) So your sensor is perfectly safe from heat. And here is a time lapse that I did a while back. The clouds ruined it, but for our purposes it's a great example. 30 second exposures with NO down time in between for 576 pictures. That's almost 288 minutes of exposure! (minus the half a second it takes for the shutter to reset). And with all that sensor activity, there is no visible hot pixels, so your sensor will be safe with no down time in-between shots. Make sure to watch in HD!! [MEDIA=youtube]ehgqAsSBby k[/MEDIA] [/QUOTE]
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