If the input to the autoencoder is normalized, do we need to use sigmoid on the last layer?

Question

According to: https://stackoverflow.com/questions/65307833/why-is-the-decoder-in-an-autoencoder-uses-a-sigmoid-on-the-last-layer

• The last layer activation function contains sigmoid in order to the output to be in range [0, 1].
• If the input to the autoencoder is normalized (each pixel between [0..1]), Can we change the activation function of the last layer from sigmoid to be something else ?
• Can we use no activation function at all ?