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BA2956800

Baader
in stock
Baader RCC Newton Coma Corrector - triplet lens - long distance


169,00 EUR
incl. 19 % Tax
excl. 6,00 EUR Shipping costs


Description
Baader RCC Coma Correktor for Newtonian telescopes with long working distance
recommended for Off-Axis-Guiders, Filter drawers etc. - up to 94.5 mm space for accessories #2956800
RCC1 coma corrector
RCC1- Coatings


RCC1 coma corrector
RCC 1 - side view


RCC 1 with off-axis-guider
RCC 1 with Off Axis Guider and LVI Autoguider


RCC 1 with DSLR
RCC 1 with spacers and DSLR camera		The RCC 1 (David Rowe Coma Correktor) is a new corrector for Newtonian telescopes with notably long working distance. Standard coma correctors only offer 55mm from their T2 threads - just and only enough for a T2 ring and a SLR camera.

The RCC 1 offers, due to its triplet lens design, 91.5mm from its T2 thread or eben 94.5mm from the M48 thread. The knurled ring can be taken off and the corrector therefore be countersunk in a 2" focuser.

The optical performance of the RCC is very similar to a WYNE Coma corrector. The correktor also works with very fast newtonians and gives a good illumination.

The RCC 1 advantages:

-- Very long working distance and space for e.g. off-axis-guiders and filters
-- Best coatings possible on all glass/air surfaces for high transmission
-- T2 and M48 connection on the camera side for a variety of options
-- Works with f/4 to f/7 Newtonians with good results
-- The RCC 1 can be countersunk in the focuser due to its removable ring

Technical details:

-- Telescope side connection: 2" with M48 filter thread
-- Camera side connection: T2 and M48 thread
-- Working distance: 91.5mm from T2 and 94.5mm from M48 thread
-- Length: 73mm - can be countersunk in 2" focusers
-- Diameter: 50.8mm / 2"
-- Lens: Triplet Lens Design

Application examples (the necessary adapters can be found in the "accessories" folder)

Use with a (D)SLR camera

You need:
-- RCC1 coma corrector: 37mm free space (before camera)
-- TSOAG27 - directly connected to the RCC1
-- TST2V10 - 10mm T2 extension ring between OAG and camera

Use with a CCD camera

You need:
-- RCC1 coma corrector: 94.5 mm space minus the camera's back focus
-- TSOAG27 - Off-Axis-Guider: screws directly into the RCC1
-- TS filter drawer for 2" and 1.25" filters: needs only 15mm optically

The rest of the distance can be bridged with T2 or M48 extension tubes.

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We recommend following products:

Adaptors:
14,90 EUR*


*  excl.Shipping costs


Baader T2 Extension Tube 7.5mm # 25C

 
15,90 EUR*


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Baader T2 Extension Tube 15mm # 25A

 
17,90 EUR*


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Baader T2 Extension Tube 40mm # 25B

 
14,00 EUR*


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T2 Extension Tube - 10mm Length

 
12,00 EUR*


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T2 Extension Tube 5mm

 
16,00 EUR*


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T2 Extension Tube - 20mm Length

 
29,00 EUR*


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TS Optics - variable T2 extension 20,5mm to 30mm

 
29,00 EUR*


*  excl.Shipping costs


Extension Tube - 2" - Filter thread - 30mm Length

 
25,00 EUR*


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Adapter M60 to 2" for Celestron and Skywatcher Newtonians

 
 
Photo Acessories:
169,00 EUR*


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TS Off Axis Guider - 27mm - 2" connection - for Astrophotography

 
99,00 EUR*


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Filter Quick Changer incl. 1x 2" filter drawer - low profile

 
25,00 EUR*


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Filter Drawer 2" - for TS Filter Quick Changer

 
 
upUser reports
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.

Stars without coma corrector @ f/4.5 - 9mm off-axis

Picture 2 - Star image @ f/4.5 with Baader RCC1 coma corrector, 9mm off-axis.

Star @ f/4.5, 9mm off-axis, with Baader RCC1

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