Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What % is the moon filter in this set?
Document: The 32mm is the best in the set, and probably the one you'll use the most.The 2X Barlow is of average quality, but can be very useful -- it'll turn the 32mm into a 16mm without cutting eye-relief (good, if you wear glasses).The Moon filter is a necessity if you want to do any lunar observing.
The results are mixed and I expect to continue to experiment on different objects. The moon filter helps, but I plan on adding a variable polarizing filter to cut out more light. It would have been nice if it came with a UHC filter.If you are starting out this is a nice set to start with. Glad I got it and would purchase it again. The case is nice and keeps things organized.
My daughter loves her kit & case. She tried the filter for the moon and was just amazed how it turned out! Great buy! !
This made a great telescope better, and enabled better enjoyment of objects other than the moon. The lunar filter wasn't a bad throw along either.
Case is sturdy, eyepieces are crisp and clear in my Celestron 127EQ, moon filter is excellent and other filters for planets are very useful. 5 out of 5!
This is a awesome product. High contrast and variety of eyepieces and the moon filter provide you a great experience. The other filter are good only but I rarely use the filters..
All lenses were as advertised. I have enjoyed using the different filters to enhance viewing of Saturn and the moon. Only item I would add to the kit would be a solar filter.
I don't care for the moon filter. It is better than nothing, but I prefer using polarizing filter for the moon.So buy it for the case and the eyepieces and if you get any use out of the rest that is just frosting on the cake!
First time I tried to see the moon, it almost burn my eye :). The moon filter was excellent. I am still ways away to explore with the other filters but the moon filter makes the view much cleaner.
You can always replace the more often used EPs once you get a better idea of what you want.Filters - I have messed around with these a bit and honestly the only thing they did for me was change the color of the object being looked at and didn't seem to really show any more detail. The exception here is the ND Moon Filter. The moon is so bright when you look at it through your scope it can be blinding.
Answer: Celestron ReportsAperture: 21 mmTransmission: 18%