The Viltrox DG-L is an automatic macro extension tube set that transforms standard lenses into macro lenses by physically extending them from the camera sensor. 

Key functions include:

Macro Photography: The primary function is to shorten the lens's minimum focusing distance, enabling high-magnification close-up shots of small subjects (e.g., insects, flowers, product details).

No Image Quality Loss: As the tubes contain no optical elements, they do not degrade the image quality of the lens they are used with.

Full Electronic Communication: The built-in electronic contacts maintain communication between the camera and lens, supporting essential features:

Autofocus (AF).

Automatic Exposure (AE).

TTL (Through-The-Lens) metering.

EXIF data transmission (recording aperture, shutter speed, ISO, etc., in the image file).

Lens stabilization (if applicable to the lens).

Versatility: The set typically includes 12mm and 24mm tubes, which can be used individually or combined (for a total of 36mm) to achieve different levels of magnification.

Cost-Effective Solution: It provides an affordable alternative to purchasing a dedicated macro lens for close-up photography.