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Most people will go for the larger telescope. but I would suggest the 8-inch scope. With the longer F ratio, the scope will be less troubled by coma, which is an annoying optical issue that degrades images. Also, any modern EP will work well at F6, but not necessary at F4.9.
The 8inch will also weight less, which means that it will probably be used more often. Use the money that U save to buy some good EPs, as the ones supplied with these scopes are somewhat basic.
U will probably be happy with whichever one that U buy, as the Dobs are outstanding value for money.
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