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I would be using it for planetary, the moon, and binary separation in my scopes from f/4 through f/10.
At this moment I am contemplating either an Orion 5.2mm MIJ Lanthenum or the Orion 5mm Planetary eyepiece, both used and at around the same price. I have a 10mm Radian that I can use with a 2x Meade #140 triplet Barlow. Should I just stick with that? I am thinking it would be easier to just insert a 5mm eyepiece into the focuser. Which eyepiece would give a sharper view with the most contrast? Any recommendations?
Thanks!
Bruce
Refractors: Meade AR-5 127mm f/9.3, Meade ST-80 f/5 and Meade 60mm f/12, Jason 60mm f/15 #313, Jason 60mm f/12 #306 S7, Bushnell Sky Chief III 60mm f/15. Reflectors/Catadioptrics: Meade 10" F/4 Schmidt-Newtonian, Galileo 120mm f/8.3 Newtonian, Meade 2045D 4" f/10 SCT, Meade ETX-90EC f/13.8 & Sarblue 60mm f/12.5 Maksutov-Cassegrains. Mounts: Skywatcher EQ6-R Pro & Meade LXD55 Equatorial mounts, ES Twilight II and Meade 2102 ALT/AZ mounts, a modified 10" SkyQuest Dobsonian mount, various 60mm EQ mounts. Misc: Celestron 20x80mm binoculars, Revolution II Imager/accessories, & lots of optical accessories/eyepieces. Projects: 8" f/2.9 and 65mm f/10 reflectors, Dobson-style binocular mirror mount.
I think any eyepiece that you would buy, in the focal length range you are talking about, with anything but a small amount of eye relief, will be a longer focal length eyepiece with its own Barlow or some equivalent built into it. The only difference between what you are using and that new eyepiece will be that the new one will have a Barlow custom designed for that particular set of lenses. Most likely, the difference in the quality of the image, or the amount of information you can get out of the view, will be marginal and possibly not detectible.
Bill Steen
Many small scopes, plus a Lightbridge 12, LX 70-8R,6R,6M
Many eyepieces, just not really expensive ones.