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I use my GSO 9mm,(Thanks Darren),and a 7mm UO orthoscopic,very often in my ED80,with NO problems at all.
BUT,these shorter focal lengths may cause brightness loss during DAYTIME.
I really dont know,as I leave daytime viewing to Binoculars.
I use these at night,mainly on planets,Saturn,for eg,is stunning,even with the 7mm Barlowed,giving about 170x Magnification.
Best Regards.
John
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