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I used to use kellners but never again. Erfles give a wide field cheaply but i found the one i had lacked good coatings so the image always looked washed out. I like the baader hyperions on my 12 inch f5. Orion stratus I think is the same design. They are bulky and heavy but reasonably priced. They have a 68 degree field too. They come up secondhand regularly and I think andrews sells them.
Rod.
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