So in our previous entry we talked about what not to do when cleaning sensitive optics such as telescope lenses and binoculars. Now it is time for a better explanation of how to properly clean those optical lenses. Note that everything mentioned here can be applied to binocular lenses, telescope lenses, and even camera lenses.
Before we discuss specific cleaning methods let me state the first rule of lens cleaning, similar to Hypocratic Oath:
DO NO HARM!
If your lenses are not dirty, don’t clean them for the sake of cleaning them. If a tiny smudge is on your lens but isn’t showing any effect on viewing, just let it be. All too many lenses have been damaged or destroyed by unneeded cleaning. So consider carefully before starting the cleaning process.
We are going to discuss two methods of cleaning optics: using a cleaner and lens tissue and using a Lens Cleaning Pen. Let’s start with the latter.
Method 1: Lens Cleaning Pen
Lens cleaning pens are sold under a variety of names but they mostly have the same features: A soft dusting brush and a flat cleaning end. The first thing you will do is brush the lens gently with the brush end.