Which type of filter can be used for lens protection and to filter excessive blue from the sky?

A UV filter, haze filter, and 1A filter all serve the purpose of lens protection and can help in filtering excessive blue from the sky, making the selection of "all of the above" a suitable answer.

A UV filter is primarily used to protect the lens from scratches, dust, and moisture, while it can also reduce the intensity of ultraviolet light, which can sometimes create a bluish cast in photographs.

Similarly, a haze filter functions to minimize the blue hues that can occur in landscapes due to atmospheric haze. It acts as a protective barrier for the lens and improves clarity in outdoor photography.

The 1A filter is a specific type of UV filter that provides the same lens protection and is particularly effective in reducing blue tones in certain lighting conditions.

Therefore, all three filters are applicable for the purposes stated in the question, reinforcing the correctness of the answer.