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Sharpness, Contrast, Light Transmission, Eye Relief, and cost.
Although I love widefields, I also like to get as extreme a close up of Galaxies as contrast and light transmission will allow me. I found when I used a Takahashi 7.5 LE that even at high mag with good contrast and light transmission you also get sharpness! And they have great eye relief.
Cost is a big factor for me until I start working again. That's why I am stuck with Series 500's, GSO's and 1 widefield Erfle (which is magic!).
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