Extension tube

With any lens, the longer the extension tube, the greater the close-up effect. The 12mm EF 12 II is often used with wide-angle lenses, while the longer EF 25 II is a better choice for normal or telephoto lenses. Auto exposure continues to work reliably, but manual focus is recommended in most instances.

www.teds.com.au

A wide-angle lens has a focal length of 35mm or shorter, which gives you a wide field of view.

www.adobe.com

There will be some light loss when we use extension tube and it will make the shutter speed get slower and the ISO gets higher. Do not hesitate to increase the ISO to get wider opening of the aperture and narrow depth of field. But it will be a different case altogether if the subject is still. You will need a tripod that will be very useful to drag the shutter speed and lowers the ISO. The best way of using extension tube is to set manual focus.

oneslidephotography.com

Extension tubes do not affect the image quality or the light transmission of your lens, and they are relatively inexpensive to buy. However, they also reduce the depth of field and the focusing range of your lens, so you may need to use a smaller aperture and a tripod to get sharp images

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