Hay-med93 Posted December 27, 2020 Share Posted December 27, 2020 I own a 6 inch telescope with 750 mm focal length I have 20 mm eyepiece and a 2x barlow that came with the telescope, want to add more eyepieces for lunar and planetary details Which one of these should i get 4 mm or 6 mm eyepiece ?? Link to comment Share on other sites More sharing options...
KP82 Posted December 27, 2020 Share Posted December 27, 2020 5mm or 8mm BST starguiders are your best bet. Link to comment Share on other sites More sharing options...
Pixies Posted December 27, 2020 Share Posted December 27, 2020 This is a good place to start: Link to comment Share on other sites More sharing options...
RT65CB-SWL Posted December 27, 2020 Share Posted December 27, 2020 Here is the full range... https://www.firstlightoptics.com/bst-starguider-eyepieces.html Being 60deg., as opposed to 50deg. and long eye relief [16mm] will be an improvement. Link to comment Share on other sites More sharing options...
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