Takahashi FSQ-85EDX - 85 mm telescope tube only
FSQ-85EDX tube sold separately: This FL1.01X corrector is already included with the telescope. This product listing is for replacement purposes; please avoid purchasing a duplicate.
CHF 3'299.00
A corrector designed specifically for the FSQ-85EDX, with a corrected image circle of 44 mm and a backfocus of 56.2 mm. Magnification factor: 1.01x; M72x1 threaded mount on the input side.
CHF 195.94incl. Swiss VAT
Part Number TKA37582
Will be ordered for you
Delivery time: 5 to 7 business days
Estimated shipping: Between November 23 and 24, 2026
The Takahashi FL1.01X, part number TKA37582, is an additional corrector designed for the FSQ-85EDX refractor. Its purpose is to improve the edge-of-field correction of this Petzval refractor, particularly when used with large sensors. It should not be confused with a focal reducer intended for another Takahashi configuration.
According to the manufacturer, the corrected image circle measures 44 mm; this accessory is designed for full-frame coverage. The 1.01x optical factor slightly increases the focal length: Takahashi lists 455 mm and an F/D ratio of 5.4 for the FSQ-85EDX when equipped with this accessory. These values apply to the documented combination with this telescope, not to the corrector used on its own.
The corrector’s inlet uses an M72x1 male thread. The manufacturer’s specifications indicate an M54x0.75 outlet—female, according to the table—and a female threaded socket on the front for M58 filters. Before selecting fittings, check the direction and dimensions of the threads on each component; the diameter alone is not sufficient to define a complete assembly.
The required backfocus behind the corrector is 56.2 mm. The value of 36 mm corresponds to the mechanical extension shown separately in the French data sheet; it is not the distance to the sensor. With a mechanical diameter of 80 mm, a length of 41 mm, and a stated weight of 200 g, this accessory must be factored into the mounting calculation. Make sure to include the necessary adapters for your camera and verify that they are included: their presence cannot be inferred from the photograph of the corrector.
| Features | Value |
|---|---|
| Reference | TKA37582 |
| Corrected image circle | 44 mm |
| Mechanical backfocus | 56.2 mm |
| Mechanical Input Interface | M72x1 male thread |
| Mechanical Output Interface | M54x0.75; female |
| Circulation | 36 mm |
| Mechanical diameter | 80 mm |
| Mechanical Length | 41 mm |
| Weight | 200 g |
View the Takahashi product page for the FL1.01X Field Corrector (FSQ-85EDX).
Here are a few accessories we've selected for this model, depending on your needs.
FSQ-85EDX tube sold separately: This FL1.01X corrector is already included with the telescope. This product listing is for replacement purposes; please avoid purchasing a duplicate.
FSQ-85EDX with finder scope and mount, sold separately, as an alternative to the tube alone. The FL1.01X corrector is already included; this product listing is for a potential replacement.
