Long exposure questions
Turn off long exposure noise reduction in the menu. It takes the same amount of time as the exposure to clean the image.
Same job can be done after in post if you need and your camera will be much faster
Oh yeah! True!
Yes as Chris said!
Nikkor 18-105mm f/3.5-5.6 G ED VR
Canon EOS 40D
Sigma 10-20mm f/4-5.6 EX
Canon EF 28-90mm f/4-5.6