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Don't know much about the Dioptrix, but the 13mm Nagler is a great choice. It is my main EP now and I love it! And great value at current prices. If you get the GSO dob that I got, it will come with 5 EPS, the 32mm, the 25mm and the Nagler 13mm will givce you heaps of views. Only ever use the others for some planetary stuff, but very rarely. Don't forget, aperture rules so try for the biggest scope you can afford and handle, then see if you can afford the Nagler!
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