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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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.