2" Moon Filter (#58 - Dark Green)

Very Shallow treaths. It does not feel secure when attached to the diagonal.

Stellarvue comment: I was concerned when I read your review so I inspected the filter. It has between two and three threads which is shallow. I then used our laboratory scale and weighed the filter. It is 0.6 oz. 2 1/2 threads are sufficient to hold something this light securely. This filter would not be used for stacking so I will continue to sell these based on my review. They are a very inexpensive way to view the moon without completely destroying one's night vision.