Now what would a solar observer do with a moon filter? The PST (or any other solar hydrogen alpha telescope) is totally unsuitable for viewing anything bar the Sun. One of the biggest problems I have with imaging the Sun using simple digital photography is that the image is often overexposed. The use of a moon filter (this one lets through 18% of the light) overcomes that difficulty, although there is often an accompanying loss of definition, unfortunately (Figure 2.50).
Now, I am one of those irritating customers who spend hours browsing in shops and, after careful consideration, end up buying something by mail order! Just every now and then, I do make a purchase and I found this for $13 in a shopping mall in Atlanta while on a business trip to the United States.
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