I just purchased my D 3000 this week and have been messing around with it. The longest exposure I can take is 25 seconds. Could someone please tell me how to take longer exposures. I was hoping to take one around 20 or 30 minutes. Thanks
Set the camera to manual exposure mode and select "bulb" for the shutter speed. The shutter will remain open as long as the shutter release is held down. Holding the shutter release with your finger will most likely cause camera movement, so a better way is to use a remote like the ML-L3 which will open the shutter on the first press and close it on the second.
As noted you need to use the 'bulb' setting. Without an external power supply, you battery will last about 30 minutes. You may also see discoloration of a section of the image due to the buildup of heat on the sensor from the electronics and this heat causing this 'noise'. Another approach would be to take a series of shorter images and then using software to stack the images. This may even provide a longer battery life besides reducing the heat buildup on the sensor. This would work best for star trails.
The D3000's battery will last only 30 minutes? I've done exposures longer than that with the D100, which uses a slightly older version of the same battery, and of course the D100 is also a 7-year-older camera. I would have thought that the D3000 was capable of going much longer than the D100...
The discoloration is called "amp noise" and it can be combated by turning on the Long Exposure Noise Reduction option. This causes a second exposure to be done immediately after the real one - the difference is that the shutter does not open for the second one. Anything that appears on the second exposure is spurious, and this is subtracted from the first one. Of course, this doubles battery consumption... and you don't want to turn it on all the time, since it cuts the multi-frame buffer in half.
Hmm... without looking it up, I'd guess that my 40-min exposures were done with Long Exp NR turned on, too...
_____ Brian... a bicoastal Nikonian and Team Member
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>I´m sure the battery of my D3000 last longer than 30 minutes. > > >But if you use "bulb" with the ML-L3 then the >shutter remains open for about 30 minutes.
Could someone please give me a step by step of how to do the long exposure in bulb mode with the ML-L3. I bought the ML-L3 on Friday and I have been experimenting with it, but I can still only get the exposure to last for 30 seconds. Thanks for all of your help!