EUR 190,00
Telescope side connection: | 2" with M48 filter thread |
Camera side connection: | T2 and M48 thread |
Working distance: | 91.5 mm from T2 and 94.5 mm from M48 thread |
Length: | 73 mm - can be countersunk in 2" focusers |
Diameter: | 50.8 mm / 2" |
Lens: | Triplet Lens Design |
User report to the Rowe coma corrector RCC1 - by Detlef Hartmann It works very well, the focal point is only laid 5mm outside. The focal length of the telescope is extended by 2.6%. Visually, the stars are tack-sharp, even at high magnification (400x). In the edge of the ST-10 field (9mm off-axis) the star are pinpoints although my telescope has not matched the ideal corrector conditions (f/4.5 instead of f/4, back focus 96.6 instead of 91.5mm). I have compared the star´s diameters in the middle and in the edges of the field - no degration is visible. Center FWHM is 2.59" and 2.5" in the edges. Even the sensor´s sesivity in the infra red (950nm) does not lead to unsharp stars. Without the coma corrector, the image quality is significantly degraded in the edges (picture 1). A little bit problematic is the vignetting: 9mm off-axis there is a light loss of 12%. But this can be easily corrected with flat fields; additionally, the effect of vignetting will be less if the correct distance between RCC1 and sensor plane is kept. Both unprocessed photos show the field edge 9mm off axis at 300%. You can see at the hot pixel´s position that the same sensor position has been exposed both times. Due to weather conditions, both images do not show the same object but nevertheless a gread quality improvement is obvious. Picture 1 - Star image @ f/4.5 without coma corrector, 9mm off-axis. Picture 2 - Star image @ f/4.5 with Baader RCC1 coma corrector, 9mm off-axis. |
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Reviews
Written by Martin Haslehner
on 2022-12-01
*****
Written by Georg Nyman
on 2022-07-21
"Ein toller Korrektor - sehr solid gebaut, dafür 5 Sterne. Die optische Qualität in Verbindung mit meinem Refraktor kann ich erst nach Testaufnahmen beurteilen"
Written by Antoniel Silva
on 2015-12-02
großartig