Fotodiox Pro Automatic Macro Extension Tube 35mm Section - for L-Mount Alliance Mirrorless Cameras for extreme close-up photography

• • Retains the lens's electronic functions, including autofocus and autoexposure
• • All-metal construction and smooth surface for effortless installation
• • No optical use – the optical quality of the lens is retained
• • Can combine tubes for different macro ratios
• • Limited 2-year manufacturer's warranty

Fotodiox Pro Auto Macro Extension Tube for Leica L-Mount Alliance mirrorless cameras are automatic tubes that transfer all electronic functions from the lens to the camera, including autofocus and autoexposure. Macro extension tubes are a wonderful alternative to expensive macro lenses. Macro extension tubes maintain the original optical quality and transform the normal lens into a macro lens. Increasing the distance between the camera body and the lens shortens the focusing distance and creates the effect of magnifying your subject. Because no optical components are added to this extension tube, the image retains the original optical properties of the lens.

This is far more desirable than the close-up lenses, which attach to the front of the lens via a filter thread and alter the optical quality, resulting in a blurry image full of artifacts. Adding an extension tube increases the effective aperture, reducing the amount of light entering the camera. This means you need to either use a slower shutter speed or a higher ISO to compensate for the loss of light. If your camera is set to an automatic exposure mode, it will do this automatically for you. Macro extension tubes are an inexpensive and easy way to convert any existing lens into a macro lens.

An extension tube is simply a hollow cylinder that fits between your camera and lens, allowing the lens to move further away from the sensor. This extra distance allows your lens to focus closer, which in turn provides greater magnification capability. Unlike most lens accessories, extension tubes do not add additional optics and are therefore relatively inexpensive, simple devices.

• • Extension tubes work best with short to medium focal lengths, but are less effective with telephoto lenses
• • Additional magnification also increases camera and subject shake, the use of a tripod is recommended
• • Make sure you use the smallest aperture (largest number) of your lens to achieve sufficient depth of field for better quality images
• • Each ring brings you closer to the subject by increasing the distance between the lens and the camera
• • Different lens lengths require different distances from the subject. If the subject is not in focus, move the camera closer to the subject or further away from the subject until the subject is in focus
• • The effectiveness of extension tubes decreases as the focal length increases. You need to be careful when working with extreme wide angle lenses because the focusing distance required may be closer to the lens than is physically possible (i.e. you would hit the front lens element before reaching focus).

Choose a magnification:	1:2 (0.5x)	1:1 (1.0x)
Note: The diagram assumes the lens is symmetrical (pupillary magnification = 1).

An extension tube increases the lens magnification by an amount equal to the extension distance divided by the lens focal length . For example, attaching a 25mm extension tube to a 50mm lens will give you a magnification of 0.5X. So if the original magnification of the lens was 0.15X, then the new magnification is 0.15X+0.5X=0.65X. The shortest focusing distance also decreases to ~210mm.

0.15x maximum magnification with a typical 50mm lens	0.65x maximum magnification after 25 mm extension tube
Note: Shown with a full frame camera and a Canon EF 50mm f/1.4 lens

All camera lenses have some natural extension that is used to focus on everyday objects. Lenses with shorter focusing distances typically have greater natural extension, but also benefit less from extension tubes. Experiment with different lenses to see how lengthening affects magnification.