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I think it depends on so many variables including telescope focal length, telescope quality, existing eye pieces, local observing conditions, preferred targets, age, experience, eye health, budget etc.
As a starting point, I would suggest building around a quality 10 mm eyepiece. For higher magnification, I think ~7mm would be reasonable. For medium to lower magnification, I think ~15-30mm (or somewhere in between around 20mm, or even both) would be reasonable. This advice would vary depending on the factors above.
Last edited by Pierre_C; 30-03-2025 at 08:25 PM.
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