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Tony raises a very good point. I was thinking that scope was F5 but I now realise it is F4.5. I have an 18"/F4.5 a 17mm Nagler, a 13mm Ethos and a TV Paracorr.
In my scope I feel a greater need to use the Paracorr with the 17mm Nagler than I do with the 13mm Ethos. In fact the 17mm Nagler really needs the Paracorr to deliver its best views in an F4.5 scope. The Ethos while improved slightly by a Paracorr in the F4.5 scope, still does very well without the Paracorr and the view without the Paracorr is still very good. You may want to try the Ethos and with any luck you won't need a Paracorr with it. If you go with the 17mm Nagler, in all likelihood you will also be buying a Paracorr.
Cheers,
John B
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