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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 MakeSONY
Camera ModelILCE-6000
Camera SoftwareAdobe Photoshop Lightroom 6.5 (Windows)
Maximum Lens Aperturef/5.6
Focal Length (35mm Equiv)58 mm
Image-Specific Properties:
Horizontal Resolution300 dpi
Vertical Resolution300 dpi
Image Created2016:03:30 15:46:07
Exposure Time1/60 sec
Exposure ProgramNormal Program
ISO Speed Rating200
Lens Aperturef/5.6
Brightness5.2 EV
Exposure Bias0 EV
Metering ModePattern
Light SourceUnknown
FlashNo Flash, Compulsory
Focal Length39.00 mm
Color Space InformationsRGB
Exposure ModeAuto
White BalanceAuto
Scene Capture TypeStandard
M 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.
In addition to what these guys said: >>3492247 >>3492249

Usually 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).
It really depends on the situation. Like >>3492249
said, 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.

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