When buying a new lens, it is important to make sure that the lens fits your specific camera. The exact measurements of lenses vary depending on the type and brand of camera you have, so it is essential to double-check these dimensions before making a purchase. Knowing the proper measurements for your camera will ensure that you get the best fit for your needs and avoid any potential compatibility issues. Additionally, be sure to check other necessary information such as filter size, image circle coverage and focal length range before making a final decision. Taking into account all of this data can help you find a lens that will work perfectly with your camera setup and produce top-notch results.