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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Baader Off-Axis Guider for RCC Coma Corrector
Baader Off-Axis Guider for RCC Coma Corrector
Baader Off-Axis Guider for RCC Coma Corrector
Baader Off-Axis Guider for RCC Coma Corrector
Baader Off-Axis Guider for RCC Coma Corrector
Baader Off-Axis Guider for RCC Coma Corrector
Baader Off-Axis Guider for RCC Coma Corrector

Baader Off-Axis Guider for RCC Coma Corrector

by Baader Planetarium
SKU BAA-2956950
$253.00 - $253.00
$253.00
$253.00 - $253.00
$253.00
Price Match Policy!
  • Tunable pick-off prism for guide star centering
  • Designed for the Baader RCC Newtonian Coma Corrector
  • Accepts standard 1 1/4" guide cameras and eyepieces
  • Eliminates differential flexure from separate guidescopes
  • Maintains a rigid, co-axial optical train
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader Off-Axis Guider for RCC Coma Corrector

    The Baader Off-Axis Guider for the RCC Coma Corrector is the only OAG designed for this system with a fully tunable pick-off prism, allowing you to precisely center a guide star on your sensor using a standard 1 1/4" eyepiece holder without ever rotating your camera.

    Precision Guiding: The Tunable Pick-Off Prism

    The core challenge of any off-axis guider is finding a suitable guide star in the corrected field. This Baader OAG solves the problem with an adjustable pick-off prism. Instead of being forced to rotate your entire imaging assembly to hunt for a star, you can tune the prism's position independently, actively centering a guide star on your autoguider's chip. This capability dramatically speeds up your setup time and ensures you can guide on the best possible star in the field.

    Designed Exclusively for the Baader RCC Coma Corrector

    This off-axis guider is not a universal-fit accessory; it is engineered specifically to integrate with the Baader Rowe Coma Corrector (RCC). This ensures correct spacing, a rigid connection, and optimal placement of the pick-off prism within the RCC's corrected light cone. The result is a solid, flexure-free guiding solution that becomes a seamless part of your Newtonian imaging train, preserving the optical corrections of the RCC for both your main camera and your guider.

    Baader RCC OAG vs. Fixed-Prism Designs: The Advantage of Adjustment

    Many off-axis guiders use a fixed-stalk or helical-only focusing mechanism, which limits your guide star selection to a narrow annulus at the edge of the field. The Baader RCC OAG provides a distinct advantage.

    • Fixed-Prism OAGs: These often force a compromise. If no bright star falls exactly where the prism sits, you must rotate the entire camera and OAG, ruining your framing. You are often left with a faint, suboptimal guide star.
    • Baader's Tunable Prism: This design lets you decouple framing from guide star selection. Once your main camera is framed on the target, you can move the prism to find and center the brightest, most stable guide star available. This leads to tighter guiding, sharper main images, and less time wasted in the field.

  • What makes the Baader RCC Off-Axis Guider's prism unique?

    Its key feature is the tunable pick-off prism. Unlike fixed-prism OAGs, this design allows you to adjust the prism's position to actively find and center a suitable guide star on your autoguider's sensor without rotating your primary camera, which saves significant setup time and improves guiding accuracy.

    What size guide camera does the Baader RCC OAG accept?

    The Baader RCC Off-Axis Guider is equipped with a standard 1 1/4" eyepiece holder. This allows it to accept any autoguider or guiding eyepiece with a 1.25" nosepiece.

    Is the Baader RCC OAG compatible with other coma correctors?

    No, this Off-Axis Guider is specifically designed for a seamless mechanical and optical fit with the Baader Planetarium RCC (Rowe Coma Corrector) for Newtonian telescopes. Its spacing and threading are optimized for that specific corrector and it is not intended for universal use.

    Why use the Baader RCC OAG instead of a separate guidescope?

    An off-axis guider uses the same light path as your main imaging camera, which completely eliminates the problem of differential flexure. This is where the main telescope and a separate guidescope physically shift slightly relative to each other, causing guiding errors and elongated stars. The RCC OAG ensures your guiding is based on the exact same motion your main sensor sees.

    Is the Baader RCC OAG a good choice for an 8" f/4 Newtonian astrograph?

    Yes, it's an excellent choice. An 8" f/4 astrograph is precisely the type of instrument the Baader RCC Coma Corrector is designed for. Pairing it with this dedicated OAG creates a rigid, high-performance imaging train that corrects for coma while providing the most accurate guiding possible by eliminating guidescope flexure.

    How does the Baader RCC OAG help when imaging a target like the galaxy cluster Abell 2151 where guide stars are sparse?

    In star-poor regions like the field around the Hercules Cluster (Abell 2151), a fixed-prism OAG might not find any usable guide star at all. The tunable prism of the Baader RCC OAG allows you to scan a much wider area for a potential guide star after you've framed your target. This significantly increases your chances of finding a star bright enough for reliable guiding, a task that would be nearly impossible with a fixed-prism design.

  • Net weight (kg) 0.17
    Barrel Size (in) 1¼"
    Optical Design Guider
    Optical length (mm) 36.5
    Outer Connection (eyepiece/-camera-sided) M42 x 0.75 (T-2)
    Inner Connection (lens sided) M42 x 0.75 (T-2)
    Pivoting Range 140°
  • Baader Planetarium Warranty