How to filter out the brightness of the moon in iPhone? Read more please?

I have purchased one these little telescope that can be attached to my iPhone 6. You can see real far with it, without attaching it to the iPhone i can look through the telescope and actually see the surface of the moon but when i attach to the iPhone and target moon, the glowing brightness of the moon doesnt allow for the image to focus on the detail of the surface, how can i add some filter bring down the brightness of the moon on my phone if there is anyway at all.

Read more: How to filter out the brightness of the moon in iPhone? Read more please?