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I use a cheap (70 pounds in London) 80mm f/5 refractor. Works fine with my QHY5 guider... however, it needs an extender tube since it is designed to have a prism in its normal configuration. Hence, it has a bit of flex at times. Otherwise, great guide scope and at a good price.
Last edited by Gem; 23-06-2012 at 08:22 AM.
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