This field corrector is specific to the FOA-60 refractor. It provides a corrected image circle of 44 mm in diameter, covering the main photographic sensors on the market. It is composed of 2 lenses, in 2 groups, and causes a very slight reduction in focal length (0.93x), from 530 mm (F/8.8) to 495 mm (F/8.2). This focal length is ideal, for example, for photographing the sun's corona during total eclipses.
The flattener is equipped with a 2'' (50.8 mm) barrel. It can be mounted and dismounted at the focus of the telescope very quickly and allows you to switch easily from a photographic to a visual configuration.
Be careful! This field flattener must not be combined with the 1.7x extender (FS-60Q). If you use the extender, there is no need to add the field corrector.
| Characteristic | Takahashi FL0.93X (FOA-60) field corrector |
| Optical design | 2 lenses (2 groups) |
| Input mechanical interface | 2'' (50.8 mm) barrel |
| Output mechanical interface | M52x075 thread, female |
| Backfocus length | 42 mm |
| Mechanical diameter | 56 mm |
| Total length | 67 mm |
| Weight | 205 g |
Diagram of threads and focal point position of the Takahashi FL0.93X (FOA-60) field corrector
Spot-diagram of Takahashi FOA-60 refractor with FL0.93x (FOA-60) field corrector