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Hi Tony
I am away from home at the moment but I can refer you to this thread I started on Cloudy Nights which may help. Rather than me post a long complicated link please do a search.
It is in the ATM, Optics and DIY forum, titled Using wide field eyepiece in f5 refractor, 17/12/2009. My user name on CN is Plyscope.
Let me know if you can't find it I will try another way to get you the info.
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