Whats the longest "Bulb" exposure you have had?

Just wondering if there are any ill effects of long exposure times. I have heard of issues of the sensor heating up. I'd like to do some 5-6 hour exposures.

The sensor will probably heat up a little. CCD sensors will demonstrate this to a greater degree, I believe. Besides heating, expect to see more hot pixels in your picture and possibly increased levels of noise.

I've never needed to do a Bulb exposure using a DSLR in real life, but did try doing a 1 hour exposure with the 1D Classic with the body cap on just for the heck of it. I was surprised that it didn't take much power from the battery.

Here's a similar thread with a ton of replies...

https://photography-on-the.net/forum/showthre​ad.php?t=188963

Thanks,

Guess I should have done a better search, I feel like acomplete noob now

Are you doing star trails?

Sensor noise and power will be the issues taking a shot that long. Some astrophotograpers use a series of many shorter exposures and combine them to cut the noise levels.

Anyways, my avatar is a 10 minute wide-angle shot of the Milky Way I took with an XT.

I've done several 15-30 minute exposure but as mentioned the noise does tend to jump in there at that long even thought I have long exposure noise reduction turned on.