Takahashi TOA 645 Flattener 0.99x for TOA-150 Refractor Telescopes
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- Provides excellent optical correction across a wide 60 mm image circle.
- Achieves extremely small RMS spot sizes (as low as ~1 micron on‑axis and only ~5 microns at the full 60 mm image circle).
- Includes an adapter ring that lets you use either an M54 or M72 camera connection with the correct backfocus distance.
Takahashi TOA 645 Flattener 0.99x for TOA‑150
The Takahashi 645 0.99x flattener utilizes a doublet lens design with fully multi-coated lenses to maintain well correct images on all compatible telescopes—up to a 60 mm image circle! Designed specifically for the Takahashi 150B refractors—whether you’re using a smaller, full-frame or medium-format sensor, this flattener delivers clean, well-corrected images from the center all the way to the edges. Even with modern cameras that use very small pixels, stars remain tight and well-defined across the entire frame.
This set includes the parts needed for an effortless attachment! The ring adapter has a male M72 threads on the telescope side, and M54 on the camera side. It can be used not only with the TOA-130NFB, but on the TOA-130NS as well! This adapter lets you connect your camera in two ways. With the adapter ring, it uses an M54 thread and positions the camera 56.2 mm from the focuser. Remove the ring, and it fits a female M72 thread, moving the camera slightly farther back to 73.9 mm, ensuring proper focus with different setups.
RMS Spot Diameter
-
On-axis (center of image): RMS spot diameter ~ 1 micron
-
30 mm image circle: RMS spot diameter ~ 2 microns
-
43 mm image circle: RMS spot diameter ~ 3 microns
-
Full 60 mm image circle: RMS spot diameter ~ 5 microns
-
Performance Note: These spot sizes produce nearly aberration-free images, even on the newest cameras with very small pixel sensors.
Train Connection Chart
Specifications
-
Type: Field flattener
-
Reduction Factor: 0.99x
-
Compatibility: Takahashi TOA‑150
-
Image Circle: Up to 60 mm
-
Optical Design: Two fully multi‑coated lens elements in two groups
-
Backfocus Distances:
• 73.9 mm from the M72 thread (no adapter ring)
• 56.2 mm from the M54 thread when using the included adapter ring -
Telescope Side Thread: M72x1 male
-
Camera Side Threads: M72x1 female OR M54x0.75 female (with adapter ring)
-
Mechanical Diameter: 3.1 in (78 mm)
-
Total Length: 2.7 in (70 mm)
-
Weight: 12.7 oz (360 g)
Other Information
- Country of Manufacture: Japan
Takahashi TOA 645 Flattener 0.99x for TOA‑150
The Takahashi 645 0.99x flattener utilizes a doublet lens design with fully multi-coated lenses to maintain well correct images on all compatible telescopes—up to a 60 mm image circle! Designed specifically for the Takahashi 150B refractors—whether you’re using a smaller, full-frame or medium-format sensor, this flattener delivers clean, well-corrected images from the center all the way to the edges. Even with modern cameras that use very small pixels, stars remain tight and well-defined across the entire frame.
This set includes the parts needed for an effortless attachment! The ring adapter has a male M72 threads on the telescope side, and M54 on the camera side. It can be used not only with the TOA-130NFB, but on the TOA-130NS as well! This adapter lets you connect your camera in two ways. With the adapter ring, it uses an M54 thread and positions the camera 56.2 mm from the focuser. Remove the ring, and it fits a female M72 thread, moving the camera slightly farther back to 73.9 mm, ensuring proper focus with different setups.
RMS Spot Diameter
-
On-axis (center of image): RMS spot diameter ~ 1 micron
-
30 mm image circle: RMS spot diameter ~ 2 microns
-
43 mm image circle: RMS spot diameter ~ 3 microns
-
Full 60 mm image circle: RMS spot diameter ~ 5 microns
-
Performance Note: These spot sizes produce nearly aberration-free images, even on the newest cameras with very small pixel sensors.
Train Connection Chart
Specifications
-
Type: Field flattener
-
Reduction Factor: 0.99x
-
Compatibility: Takahashi TOA‑150
-
Image Circle: Up to 60 mm
-
Optical Design: Two fully multi‑coated lens elements in two groups
-
Backfocus Distances:
• 73.9 mm from the M72 thread (no adapter ring)
• 56.2 mm from the M54 thread when using the included adapter ring -
Telescope Side Thread: M72x1 male
-
Camera Side Threads: M72x1 female OR M54x0.75 female (with adapter ring)
-
Mechanical Diameter: 3.1 in (78 mm)
-
Total Length: 2.7 in (70 mm)
-
Weight: 12.7 oz (360 g)
- 0.99x flattener
- M72 extension tube
- Adapter ring
- Provides excellent optical correction across a wide 60 mm image circle.
- Achieves extremely small RMS spot sizes (as low as ~1 micron on‑axis and only ~5 microns at the full 60 mm image circle).
- Includes an adapter ring that lets you use either an M54 or M72 camera connection with the correct backfocus distance.
Takahashi TOA 645 Flattener 0.99x for TOA‑150
The Takahashi 645 0.99x flattener utilizes a doublet lens design with fully multi-coated lenses to maintain well correct images on all compatible telescopes—up to a 60 mm image circle! Designed specifically for the Takahashi 150B refractors—whether you’re using a smaller, full-frame or medium-format sensor, this flattener delivers clean, well-corrected images from the center all the way to the edges. Even with modern cameras that use very small pixels, stars remain tight and well-defined across the entire frame.
This set includes the parts needed for an effortless attachment! The ring adapter has a male M72 threads on the telescope side, and M54 on the camera side. It can be used not only with the TOA-130NFB, but on the TOA-130NS as well! This adapter lets you connect your camera in two ways. With the adapter ring, it uses an M54 thread and positions the camera 56.2 mm from the focuser. Remove the ring, and it fits a female M72 thread, moving the camera slightly farther back to 73.9 mm, ensuring proper focus with different setups.
RMS Spot Diameter
-
On-axis (center of image): RMS spot diameter ~ 1 micron
-
30 mm image circle: RMS spot diameter ~ 2 microns
-
43 mm image circle: RMS spot diameter ~ 3 microns
-
Full 60 mm image circle: RMS spot diameter ~ 5 microns
-
Performance Note: These spot sizes produce nearly aberration-free images, even on the newest cameras with very small pixel sensors.
Train Connection Chart
Specifications
-
Type: Field flattener
-
Reduction Factor: 0.99x
-
Compatibility: Takahashi TOA‑150
-
Image Circle: Up to 60 mm
-
Optical Design: Two fully multi‑coated lens elements in two groups
-
Backfocus Distances:
• 73.9 mm from the M72 thread (no adapter ring)
• 56.2 mm from the M54 thread when using the included adapter ring -
Telescope Side Thread: M72x1 male
-
Camera Side Threads: M72x1 female OR M54x0.75 female (with adapter ring)
-
Mechanical Diameter: 3.1 in (78 mm)
-
Total Length: 2.7 in (70 mm)
-
Weight: 12.7 oz (360 g)
Other Information
- Country of Manufacture: Japan
- 0.99x flattener
- M72 extension tube
- Adapter ring
Takahashi TOA 645 Flattener 0.99x for TOA-150 Refractor Telescopes