I believe everyone should have a good quality barlow or focal extender (powemate) in their EP
case. It is such a useful tool. Saying that one still need to have a good EP
to barlow. Barlowing 15mm Plossl or 6mm BCO will get you nice high power views but the eye relief and FOV
will still be tight.
I had quite a few barlows over the years. My favorites are Baader Q barlow and Televue 2x and 3x. At the end I sold TV barlows and have two Baader Q barlows now, not because I did not like the views, but because TV barlows were colliding with prisms in my diagonals due to the length.
For the EPs you will see 'for' and 'against' opinions for ES
82, Delos, Morpheus and Naglers, but Delites seems to be universally loved. In my personal experience I have tried and moved away from ES
82, Morpheus and Delos, but Delites are keepers.
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: Orion: Binoviewers, Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs, XL & 2xXFs; TeleVue: Delites, Panoptic & Plossls; ES: 68, 62; Vixen: 2xSLVs; Baader: 2xBCOs, Aspherics, Mark IV, Meade: Plossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: Positive lock prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2293 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1817, S110: 77). Doubles: 1452, Comets: 19, Asteroids: 97