Can this be used to clean the mirror of a Newtonian telescope?

Technically, you can clean the primary mirror of a Newtonian with the Celestron LensPen, specifically with the retractable brush. However, generally speaking you will want to clean a Newtonian primary as seldom as is practical. A few water spots on the primary, for example, do not degrade the image significantly enough to warrant attempting to clean its surface. Exposing a primary mirror to any kind of potentially abrasive treatment presents a risk of damage to the mirror. In most cases application of distilled water with air drying (possibly a burst of compressed air) to the surface is sufficient, but a primary typically can go for years without needing any kind of attention, unless you're working with a truss tube Newtonian, in which case a gentle brushing with the retractable brush may be periodically necessary--say once or twice a year at most frequent, depending on your dust conditions. For the most part, however, the optical surfaces of a Newtonian should be handled as little as possible to minimize the risk of scratching.

What kind of material is the brush? Is it camel hair??

Since I can't find anything that says what the brush is made of, I'm going to say "no" to the camel hair.

Doesn't the black stuff on the special cleaning element just smudge on the lens? I'm afraid to use it on my expensive camera lenses.

Greetings, Funny thing happened to me on the way to the forum. I lost my lens pen a week after purchasing and before I was even able to try it out! I imagine it will turn up eventually. But enough with my problem.Here is a quick YouTube demo using a lens cleaning pen:https://www.youtube.com/watch?v=KqRswANILMEI picked it because it lacked all the jibber jabber. Listen to the guy exhale on his lens and polish the lens surface for the final time. Between the two polishing sequences, the user put the polishing nub back into its cap, and gave it a twist to replenish the cleaning nub with more polish for the final sequence. You can look for a few other, longer and more talkative YouTube demos to get a clearer understanding.The polish is exceedingly fine and will not damage the lens coating. It IS important, however, to use the brush end FIRST to remove any dust and crud that may grind into the lens surface when using the cleaning nub.

Brand	Celestron
Manufacturer	Celestron
Model	93575-CGL
Model Name	LENSPEN OPTICS
Product Dimensions	10.16 x 20.32 x 10.16 cm; 31.75 g
Item model number	93575-CGL
Special Features	No liquids are used...nothing to spill or dry out
Mounting Hardware	Cleaning Too
Number of items	1
Standing screen display size	6 Inches
Batteries Included	No
Batteries Required	No
Material	Black Plastics
Does it contain liquid?	Yes
Has audio recording capabilities	No
Has Auto Focus	No
Includes Rechargeable Battery	No
Is there a timer?	No
Manufacturer	Celestron
Country of Origin	USA
Item Weight	31.8 g

Celestron Lenspen Optics Cleaning Tool

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