What's the difference between taking a long exposure in M mode and using Bulb mode, besides the fact that you can press the button at any time to take the picture in Bulb mode?[EXIF data available. Click here to show/hide.]Camera-Specific Properties:Equipment MakeSONYCamera ModelILCE-6000Camera SoftwareAdobe Photoshop Lightroom 6.5 (Windows)Maximum Lens Aperturef/5.6Focal Length (35mm Equiv)58 mmImage-Specific Properties:Horizontal Resolution300 dpiVertical Resolution300 dpiImage Created2016:03:30 15:46:07Exposure Time1/60 secF-Numberf/5.6Exposure ProgramNormal ProgramISO Speed Rating200Lens Aperturef/5.6Brightness5.2 EVExposure Bias0 EVMetering ModePatternLight SourceUnknownFlashNo Flash, CompulsoryFocal Length39.00 mmColor Space InformationsRGBRenderingNormalExposure ModeAutoWhite BalanceAutoScene Capture TypeStandardContrastNormalSaturationNormalSharpnessNormal
>>3492245M you still set a shutter speed ahead of time. Bulb means the shutter will stay opened while you hold the button and close when you release it.
You're able to stop the exposure at any time.With fireworks, you can open the shutter with the effect and close the shutter again as soon as the effect is gone. Or, for another example, you can also stop the exposure if it was bright or a lot of fireworks and, conversely, expose longer if it was dark or little fireworks.
>>3492245In addition to what these guys said: >>3492247 >>3492249Usually M has a maximum time limit, whereas bulb mode will let you keep it open until your battery runs down (or at least will have a significantly higher max length).
>>3492245It really depends on the situation. Like >>3492249said, fireworks are a situation where it can make a difference. Also, most cameras these days have a minimum shutter speed of 30 seconds (or 8s on a lot of 35mm cameras), which can be passed by going into bulb mode. Or, if you're me, you use bulb because you're using an older shutter on something like a LF camera with a minimum speed of 1 second. Or if you're trying to capture motion blur you can make sure you get exactly the level of blur you want by manually depressing the shutter to end the exposure.It's another manual feature of the camera you may or may not use depending on your vision for a very specific situation.