When considering the purchase of a used 16-inch mirror that requires recoating and has chips, there are several factors to take into account.
Cost of Recoating: Research the cost of mirror recoating services to determine your additional investment. Recoating prices can vary based on the mirror’s size and the type of coating required. Ensure the company you choose has a good reputation and experience with astronomical mirrors if that’s the intended use.
Impact of Chips: Evaluate the severity and location of the chips. Small chips often do not significantly affect the mirror’s performance if they are at the edge. However, larger or centrally located chips can degrade image quality. Also, consider if these chips can be polished out or will remain part of the mirror’s surface.
Current Market Value: Compare the overall cost (including the mirror price and recoating services) with the price of a similar new or used mirror. This will help you assess if you’re getting a good deal or if you’re better off looking for an alternative in better condition.
Intended Use: Consider the purpose of your mirror. If it’s for high-precision tasks like astrophotography, the minor imperfections might be more problematic than if it’s for general observing.
Time Frame and Convenience: Factor in the time it will take for recoating and whether you can afford to wait. If there’s urgency in setting up your equipment, this delay might be a deterrent.
If the overall costs, time, and potential performance setbacks are minimal compared to getting a pristine mirror, and especially if you are on a budget, it could be a worthwhile investment. However, ensure thorough research and consultation with professionals if possible before making the final decision.