TS-Optics Newtonian Coma Corrector 1.0x TSGPU Superflat - 4-element - 2" connection Reviews

Wrote by Thomas R. on 05.05.2021

"Feine Sternpunkte bis in die Bildecken am GSO-4""-f/4-Newton bei APS-C-Sensoren. Bei der ZWO ASI 183 MC Pro hatte ich mit dem alten Korrektor immer Geister im Bild, weswegen ich ihn an dieser Kamera wegließ. Dieses Problem ist mit dem GPU nicht mehr existent."

Wrote by Guest on 29.04.2021

Optical performance
I am very satisfied with the results. Perfect distance needs some fine-tuning especially when filters are involved. Mine performed better close to 57mm distance. I believe that it needs a UV/IR filter to have perfect star colors.
One very positive thing I saw is that it has minimal distortions across the field of an APS-C sensor. When using the Annotation feature of PixInsight, all stars are where they are supposed to. In the extreme corners, stars are off just by a couple of pixels. Something that my older Baader MPCC never could match. With MPCC some stars were a several pixels further than their correct position, showing a strange "moustache" distortion. I do not believe that there would be any perceptible distortion in a M4/3 sized sensor or smaller.
Finally it has 10-15% more vignetting than a Baader MPCC, tested in a 8" F/5 GSO, with 62mm secondary and APS-C sensor.

Mechanical performance
Mechanically it hides some surprises. It is slightly thinner than a normal 2" barrel, so it may "wiggle" a little bit inside a focuser. This is probably by design, to aid screwing the corrector inside the focuser. Now if the focuser supports this you have to go this way. Using the 2" clamp, may slightly tilt the corrector, destroying a perfect collimation.

Wrote by Florin K. on 01.01.2021

"Durch Empfehlung gekauft ! Sehr sehr gut ! Ich benutze für ein 200mm Durchmesser F/4,5 Newton "

Wrote by Johann S. on 17.11.2020

"Tolles Produkt, mein Tipp... Abstandringe nicht vergessen "

Wrote by Thomas S. on 11.11.2020

"Der GPU Krrektor hat gegenüber der günstigeren Variante von TS eindeutig die Nase vorn. Günstigere Modell zeigen bei Aufnahmen mit hellen Sternen schon mal deutliche Reflexe, das habe ich hier noch nicht feststellen können. Die Sternabbildung ist selbst bei Vollformat (Canon 5D IV Canon EOS R) bis an den Rand perfekt."

Wrote by Goffin B. on 06.10.2020

"Excellent optical quality, very good correction. "