No, not every Canon lens fits on every Canon body. Canon has two main types of lens mounts: EF and EF-S. EF lenses can be used on both full-frame and crop sensor Canon bodies, while EF-S lenses are designed specifically for crop sensor bodies. Additionally, Canon has recently introduced the RF mount for their mirrorless cameras, and while EF lenses can be used on RF bodies with an adapter, RF lenses are not compatible with EF or EF-S bodies. Therefore, it's important to ensure compatibility between the lens mount and the camera body before purchasing or using a lens. **

For Twitch streaming with the Canon EOS M50, a wide-angle lens with a large aperture would be suitable. This would allow for a wider field of view and better low-light performance, which is important for streaming. A popular choice for this purpose is the Canon EF-M 22mm f/2 STM lens, which provides a wide angle of view and a large aperture for good low-light performance. Additionally, it is a compact and lightweight lens, which is convenient for streaming setups. **

No, the Canon lens is not necessarily defective just because it cannot be adjusted. Some lenses are designed to have fixed focal lengths and cannot be adjusted, such as prime lenses. However, if the lens is supposed to have adjustable focal lengths and it cannot be adjusted, then it may be defective and in need of repair or replacement. It is important to refer to the specific specifications and capabilities of the lens to determine if it is functioning properly. **

The Canon 18-135mm lens is generally not considered to be blurry. It is a versatile lens that offers a good balance of zoom range and image quality. However, like any lens, the sharpness of the images it produces can be affected by factors such as aperture setting, shutter speed, and the photographer's technique. With proper settings and technique, the Canon 18-135mm lens is capable of producing sharp and clear images. **

It can be worth repairing a Canon lens depending on the extent of the damage and the cost of the repair. If the lens is a high-quality and expensive model, it may be worth investing in the repair to maintain its performance and value. However, if the repair cost is close to or exceeds the cost of a new lens, it may be more economical to replace the lens instead. It's important to weigh the repair cost against the value and usefulness of the lens before making a decision. **

The Canon EOS lens 2 is a high-quality lens designed for use with Canon EOS cameras. It is part of Canon's EF lens series, which means it is compatible with both full-frame and APS-C sensor cameras. The lens features advanced optical technology to deliver sharp, clear images with minimal distortion and aberrations. It is a versatile lens suitable for a wide range of photography applications, including portraits, landscapes, and action shots. **

The Canon R6 is compatible with Canon's RF lenses, which are specifically designed for the RF mount on the R6. Some popular RF lenses for the Canon R6 include the Canon RF 24-70mm f/2.8L IS USM, Canon RF 50mm f/1.2L USM, and Canon RF 70-200mm f/2.8L IS USM. These lenses offer excellent image quality, fast autofocus performance, and overall great usability with the Canon R6. **

The Canon EF 75-300mm f/4-5.6 III is a popular and affordable telephoto lens suitable for Canon cameras. It offers a good range for capturing distant subjects and is a great option for amateur photographers looking to explore telephoto photography without breaking the bank. While it may not have the same image quality or build as more expensive lenses, it still provides decent performance for its price point. **