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What's ya budget and what type of viewing are you looking for the EP to do?
Is your dob an f5?
Are those the Ep's you have now and are they all 11/4"
Are you after 2"EP's?
Do you have a barlow, if so what?
You will want to try the wide field of 2"Ep's , so you can go the cheaper way with the Andrews30mm 80deg or a 30mm GSO SV's.
40mm will be too large an exit pupil for F5 you want to stick to somthing <35mm.
Both of these EP's are resonable good for the money , but they do have limitations and it will depend on how fussy you are with certain aberations.
If you want to invest in the best for wide field and your budget allows , then Naglers .
Mark
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