Note 1.The Shutter and the Shutter speed

The shutter on a camera does what it says on the box, it opens a hole, the aperture, to let the light in to register on the sensor to produce and image.
The shutter speed of a camera has a very wide range and if that is not enough the shutter can be set to operate on a manual setting or ‘Bulb’. On ‘Bulb’ setting the shutter can be open ‘all day long’ if need be. But there is a price to be paid for a straight forward long exposure. This is where a technique of using the cameras ISO setting comes in also the use of Filters, another technique.
Let us go back to the mechanics of the shutter.
There is such a thing as Camera Shake when you press the button. If not from the ‘jerk/press of the shutter button but internally a shake caused by the mirror opening and closing (this applies to a Single Lens Reflex Cameras). The reflex part being the, ‘moving out of the way of the mirror to let the light in’.
To alleviate or mitigate Camera Shake, which can happen with all cameras, you do not want it at all. Some incorrect settings can be put right with the appropriate software but a blurred image there is not much one can do about it.
Camera Shake can occur even if you are very careful with pressing the button/release. This is where the camera moves as you press the button and the shutter is, released. The camera needs to be rock steady. Some people can hold a camera steady enough at 1/30 of a second some cannot hold a camera steady at all on a ‘slow’ or even faster shutter speed. To overcome this put the camera on a tripod and use a cable release. Cable release come with remote or physically attached to the camera into one of the cameras ports. To mention here that also the longer the lens the easier it is to get Camera Shake which we will go into on the Technique Lenses No. X
So Camera Shake occurs when you press the release and also internally.
There is a co relation in obtaining an image from an optical instrument such as a camera. It is the magic triangle of Shutter – Aperture – ISO
Adjusting one component unbalances the other two. All three need to be in harmony.
We now need to talk about the Aperture, as it is next on the list. Note 2