TS-Optics RC 0,8x Korrektor Reducer für Ritchey Chretien mit Adapter Bewertungen

Geschrieben von Sandor A. am 27.05.2026

"High quality, perfect image."

Geschrieben von Masami Y. am 19.01.2024

"large aperture for my APS-C CMOS camera"

Geschrieben von Federico C. am 07.04.2023

"Ich habe dieses Produkt zurückgegeben und mich für ein anderes Produkt von Teleskop-Service entschieden (Explore-Scientific 152mm Maksutov Newtonian Telescope). Beide Transaktionen verliefen schnell und vollkommen problemlos."

Geschrieben von Karel K. am 21.02.2023

"Getestet mit RC 406/3250 in der Sternwarte Zdanice (Tschechien). Tolles Produkt, die Aufnahmen sehen sehr gut aus. "

Geschrieben von langlois s. am 29.04.2022

"superbe article la qualitée est au rendez vous je le conseil"

Geschrieben von Gast am 09.09.2020

I first need to say that this reducer is very good, before I say that it isn´t perfect :) Reducers for large sensors are tough to design (looking at the strong curvature of the front element you get the idea), especially when they´re close to the focal plane.
- Mechanics: Built like a tank, solid, no rattle, excellent surface finish, both covers are metal, the lenses seem to have blackened edges and good AR coatings.
- Optics: On a full frame sensor the stars are pretty tight up to roughly 36mm diameter (sensor wider side), outside of this range (corners) curvature/aberrations become noticeable but still minor. Field illumination is consistent. Sample CCDInspector report from my test (focusing at image center): min. FWHM: 2.50´´, max. FWHM: 3.25´´, curvature: 25%. Tested only on short (30sec ISO3200) exposures on my custom made 250mm f/8 (f/3 primary) RC and Canon 5D MkII.
- Notes: For optimal performance it is crucial to match the stated 82mm back working distance. I conducted a test to confirm this distance (match to my particular OTA) and it turned out very consistent - exactly 82mm. Recommended tolerance for full frame sensors is ±1mm, exceeding ±2mm will start to degrade the corners noticeably.
- My conclusion so far: Pretty good, minor issues in extreme corners, about what I expected. I never tested the general purpose Astro-Physics 27TVPH & CCDT67 alternatives, but judging by the images from the Net I believe this reducer would be far superior on APS-C and larger sensors. I still haven´t tested it on a monochrome camera with filters and long exposure, so I cannot yet tell if there are any hidden issues at extreme wavelengths (on a visual range DSLR it looks OK).