As you know I have Celestron version of 6" F5. It is amazingly lightweight and compact. It is ideal for low to mid power wide field DSO
views. It is my to go instrument for open clusters and extended nebulae. I also enjoy splinting doubles at lower powers.
I would say that in 20-100x range CA
is not an issue. In this range stars are colorful and tight.
Bumping above 100x, CA
really kicks in. You could still do planets and Moon, but even with good amount of details resolved they look mushy. I have better instruments for that job, so I hardly use 150ST.
hunting useful range of EPs are from 36mm to 7mm. I know some users reported using EPs in 3.5-5mm range. But for me stars bloat below 7mm and I just don't enjoy resulting views. I think viewing conditions and quality of telescope sampling are definitely factors there.
In 20x-100x range the scope really shines. Sagittarius Milky Way, fitting M31 in 3 deg FOV
, Veils complex with OIII - mind changing views!
You need to watch for the field curvature though. To me it is more annoying than CA
. Ironically, 82 deg EPs praised for the field correction in DOBs exaggerate field curvature in 150ST, and 14mm and 20mm Pentax XWs bashed for the FC on forums correct FC of 150ST. So, much EP
to scope rule always applies.
Baader Aspheric 72 deg 36mm and 31mm and Pentax XWs 7mm to 20mm are the EPs of choice for my 150ST.
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 1805 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1377, S110: 77). Doubles: 1341, Comets: 15, Asteroids: 78