A lens speed booster is an optical adapter that reduces the effective focal length of a lens while increasing its maximum aperture. This allows you to use full-frame lenses on cameras with smaller sensors, such as APS-C or Micro Four Thirds cameras. The adapter works by compressing the image circle produced by the lens onto the smaller sensor, effectively increasing the amount of light that reaches the sensor.
One of the most popular brands of lens speed boosters is Metabones. Their Speed Booster adapters are designed to work with a wide range of lenses and camera systems. They’re easy to use and can significantly improve the performance of your lenses.
When choosing a lens speed booster, it’s important to consider the crop factor of your camera. The crop factor is the ratio of the size of your camera’s sensor to that of a full-frame sensor. For example, an APS-C sensor has a crop factor of 1.5x, which means that a 50mm lens on an APS-C camera will have an effective focal length of 75mm.
In conclusion, lens speed boosters can be a great way to improve the performance of your lenses and expand your creative options. They’re easy to use and can help you get more out of your existing gear. Just make sure to choose an adapter that’s compatible with your camera system and your lenses.