Best fοr mе defined іѕ: Best Detail (Moon, Jupiter, Saturn, ect.)
I know thіѕ isn’t thе ideal scope fοr planetary viewing, hοwеνеr, іf money wаѕ nο obstacle, whаt wουld bе thе best eyepiece fοr thіѕ dob. Alѕο, a lower budget eyepiece suggestion wουld bе nice tοο.
I hаνе looked аt 6mm Radian, 7mm Nagler, 7mm Pentax XW, Orion Edge οn 6mm, University HD 6mm,.. I don’t wear glasses whеn viewing ѕο I’m nοt sure іf eye relief іѕ οf importance… hοwеνеr I don’t want tο gеt a University HD wіth small eye relief аnd look аt thе sky іn dead winter аnd worry аbουt eye heat… Yου mау see mу concerns… Someone hеlр plz!
The ones you are looking at are all fine for what you want to do. One thing that you can do for lunar observing is to add an aperture stop that lowers the glare, but also adds focal length. Also think about a variable polarizer for adjusting brightness.
Another thing to consider is your local weather. Atmospheric turbulence will do more to reduce seeing detail than anything else. Next, make sure your optical train is in as perfect collimation as you can make it. A more radical thing to do is have your primary checked and reground and recoated for a better figure.
Eye heat is less of a concern than eye relief. You don’t want to have your eyelashes getting grease on the optics. Depending on your location, you may need to add an eyepiece dew heater because of the moisture coming off you body may condense on exterior optics.
Lastly, depending on your type of dob, is to look for internal reflections and flock the tube and black out anything that may reflect light.
http://www. raclub. org/Documents/Programs/Collimating%20Newtonian%20Reflectors. pdf
http://www. astronomics. com/main/definition. asp/catalog_name/Astronomics/category_name/tegugu99×3m6f9lghe8/Page/1
http://www. cleardarksky. com/csk/coverage. html
http://www. cloudynights. com/documents/planetaryeyepieces. pdf
http://www. fpi-protostar. com/flock. htm
Of the eyepieces you mention only the University Optics is a planetary eyepiece: the others are more for DSOs. Use on the Moon and planets will result in a certain amount of scattering and lateral colour. Planetary eyepieces tend to be simpler designs with fewer elements and narrower fields of view but, critically, much higher contrast.
The best eyepiece would be a TMB Monocentric but those are now out of production and go for hefty prices even on the used market. The vanilla TMB Planetary eyepieces are a good second choice. The Baader Genuine Orthos are very well regarded too (essentially similar to the University you are looking at). Even more general designs such as a good Plossl will outperform the eyepieces you are looking at for planetary work – say a Meade Series 5000 for example.
Finally, think about your magnification. 207x is quite high power and often the seeing isn’t good enough to warrant it. I wouldn’t put all your eggs in one basket but make sure you have good lower power options, at perhaps 100 and 150x.
Almost forgot: I put up a comparison of a few planaetary eyepieces a couple of years ago: http://members. multimania. co. uk/astrofiona/Saturn/