Takahashi TKA31587S: TOA-645 correction kit for TOA-130
TOA-645 Correction Kit for TOA-130NS. Check the connections and alignment according to the optical train.
CHF 529.03
Takahashi TOA-130NS telescope with a 130 mm ED triplet, native focal length of 1,000 mm at F/D 7.7, and a 2.7-inch rack. Part number TOK13010, tube only.
CHF 5'194.30incl. Swiss VAT
Reference TOK13010
Will be ordered for you
Delivery time: 5 to 7 business days
Estimated shipping: Between November 23 and 24, 2026
The Takahashi TOA-130NS combines a 130-mm objective with a native focal length of 1,000 mm, resulting in an F/D ratio of 7.7. Its wide-air-gap triplet includes two S-FPL53 ED glass lenses. This optical design corrects chromatic aberrations to preserve sharpness and contrast in both astronomical observation and photography.
The 2.7-inch rack provides focusing. The TKA31430 counterbalance collar included with the tube helps counterbalance the weight of the lens. The native back focus is 222.5 mm. The retractable dew shield reduces the space required for storage.
The TOA-35FL corrector and the TOA-35RD reducer are available as options. To assemble the photographic train, follow the diagram for the TOA-130NS version and the selected accessory: it specifies the adapters and distances to the sensor.
TOA-130NS tube with TKA31430 balancing clamp. The probe, its mount, and the mounting clamp must be ordered separately; the balancing clamp serves a distinct purpose.
Choose a frame and mount that are compatible with the assembled unit, then check the balance and tightness.
Takahashi TOA-130NS Documentation
The Takahashi TOA-130NS is an apochromatic triplet refractor with two ED lenses, featuring a 130 mm aperture and a 1000 mm focal length (f/7.7), designed primarily for deep-sky astrophotography. Its focal length is ideal for observing galaxies (M51, M101, the Leo Triplet), planetary nebulae such as M27, and globular clusters, with a good level of detail. At f/7.7, which is rather slow for deep-sky imaging, it benefits from being used with a focal reducer.
With an APS-C camera featuring 3.76 µm pixels (Sony IMX571 sensor), you get approximately 0.78″ per pixel for a field of view of 1.3° × 0.9°. This is a fine resolution: under moderate turbulence, 2×2 pixel binning or a 0.7× reducer will produce rounder stars. With the 0.7× reducer, the resolution increases to 1.11″ per pixel and a field of view of 1.9° × 1.3°.
Yes, whenever you're using an APS-C or full-frame sensor: like any uncorrected triplet lens, it has a slight field curvature that stretches the stars in the corners. Dedicated correctors: Takahashi TKA31587S: TOA-645 correction kit for TOA-130 ; Takahashi TOA-35 - 0.7× focal reducer for TSA/TOA (focal length equivalent to 700 mm, f/5.4); Takahashi 35FL: 50.8 mm field corrector for TSA/TOA.
222.5 mm (metal back); 117.5 mm with TOA-35FL; 56.2 mm with TOA-645FL; 65.5 mm with TOA-35RD 0.7×. This focal length is measured from the thread to the sensor, including rings, filter wheel, and filter drawer: adhering to this measurement down to the millimeter ensures that stars remain round in the corners.
The tube weighs about 9.9 kg; with the camera, filter wheel, and guiding system, expect a total weight of around 11.4 kg: aim for an EQ6-R Pro-class mount. A refractor requires no collimation: once balanced, it’s ready to use as soon as it reaches operating temperature. At 101.2 cm long, it requires a decent-sized storage space.
Yes, as a bonus: with an angled mirror and an eyepiece, it provides high-contrast, color-accurate images of the Moon, the planets, and double stars, up to about 260×.
Here are a few accessories we've selected for this model, depending on your needs.
TOA-645 Correction Kit for TOA-130NS. Check the connections and alignment according to the optical train.
1.5× ED extender to increase the focal length. For photography, Takahashi recommends the TOA-35 corrector; check the connections and do not place a filter on the eyepiece end of the extender.
190-mm motorized flat panel for a 180-mm anti-fog screen. Check the mounting, alignment, travel, cables, and ensure the control unit is compatible with your system.
Takahashi 156WM double collars for TOA-130NS or NFB, as an alternative to the 156WT. Top plate included; separate bottom plate. Check the attachment to the mount, the load, and the balance.
Takahashi 156WT double collars for TOA-130NS or NFB, as an alternative to the 156WM. Upper plate included; separate L-shaped lower plate. Check the attachment to the mount, the load, and the balance.
Takahashi 156S-GT symmetrical one-piece mount, an alternative to the 156WM or 156WT double mounts; separate lower plate. Check the mounting, load, and balance.
The CAA-M TKA23200N rotator is sold separately to adjust the camera’s orientation on the TOA-130NS. It is different from the balancing collar already included with the tube; check the assembly, connections, and focus according to the optics.
Recommended diameter: 200 mm. Check the measurement and the mounting.
Pro V2 may be possible, depending on the corrector; check the rings and the draw.
