As an AI language model, I don't have personal preferences or feelings. However, I can provide information and discuss topics related to High School Musical if you'd like. **

The main difference between the Sigma 30mm 1.4 DC HSM and the Sigma 30mm 1.4 DC HSM Art is that the Art version is part of Sigma's high-end Art series, known for its superior optical performance and build quality. The Art lens typically features better image quality, sharper details, and improved color rendition compared to the non-Art version. Additionally, the Art series lenses often have a more robust construction and enhanced features, making them a preferred choice for professional photographers or enthusiasts looking for top-notch performance. **

Yes, there is a Sigma 70-200mm f/2.8 HSM APO lens available for Nikon. This lens is designed for Nikon DSLR cameras and offers a fast maximum aperture of f/2.8, making it suitable for low-light photography and achieving a shallow depth of field. The HSM (Hyper Sonic Motor) ensures fast and quiet autofocus performance, while the APO (Apochromatic) design helps to minimize chromatic aberrations for improved image quality. This lens is a popular choice for professional photographers and is widely available for purchase. **

Yes, the Sigma 150-600mm F5-6.3 DG OS HSM Contemporary can be suitable for sports photography due to its long focal length range of 150-600mm, allowing photographers to capture action from a distance. The lens also features optical stabilization and a fast autofocus system, which are essential for capturing fast-moving subjects in sports. However, the variable aperture of F5-6.3 may not be ideal for low-light conditions or indoor sports where a faster lens would be more beneficial. **

Yes, the 50mm f/1.4 Sigma DG HSM Art lens will fit on an APS-C camera. The lens is designed for full-frame cameras, but it is also compatible with APS-C cameras. When mounted on an APS-C camera, the lens will have a focal length equivalent to around 75mm due to the crop factor, making it a great choice for portrait photography. **

Yes, the Sigma 150-500mm f/5-6.3 DG OS HSM lens is compatible with Nikon cameras, including the D80. The lens has a Nikon F mount, which is the same mount used by the Nikon D80, so it will fit perfectly on your camera. Just make sure to check the compatibility of the lens with your camera model before purchasing. **

Yes, the Sigma 150-500mm f/5-6.3 DG OS HSM lens is compatible with the Nikon D80 camera. The lens uses a Nikon F-mount, which is the same mount used by the Nikon D80. Therefore, you can attach the Sigma 150-500mm lens to your Nikon D80 camera and use it for capturing distant subjects. **

To use the Sigma 30mm f/1.4 DC HSM Art lens on the EOS 650D, you will need to ensure that the lens is compatible with the Canon EF mount. You can attach the lens to the camera body by aligning the red dot on the lens with the red dot on the camera mount and then twisting the lens clockwise until it locks into place. Once the lens is securely attached, you can start shooting with your EOS 650D using the Sigma 30mm f/1.4 DC HSM Art lens. **