Long Exposure Mistake #3: Using Image Stabilization
Though it might seem prudent to use image stabilization to reduce movement while the shutter is open for a long exposure, it’s actually a primary cause of poor long exposure images.
The reason for this is that with such long exposures, your camera and lens need to be on a tripod for stability.
When you use image stabilization for a camera that’s on a tripod, the image stabilization system might still try to compensate for movement.
Ironically, that means that the stabilization system actually causes vibration, thereby making the shot less sharp.
Having your camera on a good, solid tripod and using a camera remote is all the stabilization you need for long exposures, so turn image stabilization off!