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As far as Pentax eyepieces are concerned which I use for short focal length refractors -I have various - XL, Zoom XL + Zoom XF. When seeing is excellent I use a 2.25 times baader barlow which screws into the bottom of the eyepiece -last week I pushed my 4 inch F5 and 5 inch F5 scopes up to 80 per inch on Jupiter - using the baader as well- the views were fantastic on the Pentax eyepieces I preferred the views to on these versus other eyepieces -Tak + Televue radians which I have
To be fair I don't have eg Ethos eyepieces so I cannot compare to eyepieces such as these but I am extremely satisfied with Pentax
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