How many times does it take to select a long exposure device with B-door?

When using a camera with a B-door (bulb mode) for a long exposure, you need to press the shutter twice.

In B-door mode, pressing the shutter button once will open the shutter and keep it open until pressing the shutter button for the second time or releasing the shutter button. When the shutter is pressed for the first time, the camera starts to expose. When the shutter or release button is pressed for the second time, the camera will close the shutter and end the exposure.

So for a long exposure, you need to press the shutter button twice. When the shutter is pressed for the first time, the shutter opens and the exposure begins. Then, you can use the remote control, cable shutter or timer to control the required exposure time. When the required exposure time is reached, press the shutter button or release button again, the shutter will close and the exposure process will end.

This operation mode allows you to flexibly control the duration of long exposure, and at the same time reduce the camera shake that may be caused by manually holding down the shutter button.

When we talk about exposure devices, we usually refer to tools used to control exposure time, such as cable releaser, remote controller or timer. These devices can help photographers to control the exposure time more accurately during long exposure and reduce camera shake that may be caused by manual operation.

Cable release (also called trigger wire) is the cable that connects the camera and the shutter button. By pressing the button on the shutter line, you can remotely control the opening and closing of the shutter, thus achieving accurate exposure time control.

The remote control is a wireless device paired with a camera. By pressing the button on the remote control, you can remotely control the shutter behavior of the camera, including opening and closing the shutter to achieve the required exposure time.

Timer is a kind of equipment with complex functions, which is usually used with cameras. In addition to remote shutter control, timer can also provide more functions, such as timed exposure, delayed shooting, interval shooting and so on. , so that photographers can control the exposure process more flexibly.

These exposure devices are designed to help photographers control the exposure time more conveniently and accurately during long-term exposure. You can choose the right equipment according to your own needs and operate according to your own needs.