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Customer Education

In order to assist our customers in the successful completion of their projects, we provide the following information and software tools for your use - free of charge. Please feel free to contact us with any questions you may have.


Diagonal Calculator

We offer this software utility to calculate the correct size diagonal mirror for your Newtonian telescope project. The utility is intuitive to use and offers off-axis illumination calculations as well.

Download the install package here.

Youtube Videos

O.W.L. offers a number of instructional videos on subjects related to telescope optics. Topics range from how to clean your newtonian telescope mirror to how to pack large optics for shipping.

Our youtube site address is:



How to wrap optics:



How to box optics: