Hi Jeff,
Myself next on my shopping list is an observing chair. I actually purchace new lenses first but in all realism I should have gone for the chair.
Lense need extra careful considering and would time a long time to make the consideration. I based my descision on my future of astronomy. So my lenses where good wide field but not over price as some can be. My new lenses are Baader Hyperion but I intend to do more Astro photography so I didn't spend the money on Ethos, Nagler or Pentax lenses. Even though Baader are not as good as Ethos etc they still a big step up from the standard Plossls.
First though if you want to look after your back get a obs chair.
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