Takahashi TOA-150B - 150 mm apochromatic telescope, tube only
Compatible scope sold separately. The 150 kit includes the M72 51S extension and the CA35 ring; check the diagram and adjust the sighting from the correct reference surface.
CHF 12'677.86
Takahashi TOA-645 Field Corrector Kit for the TOA-150, with a 60 mm corrected image circle and a back focus of 56.2 mm from the CA35 exit port.
CHF 618.09incl. Swiss VAT
Part Number TKA32587S
Will be ordered for you
Delivery time: 5 to 7 business days
Estimated shipping: Between November 23 and 24, 2026
The TOA-645 TKA32587S kit is designed for imaging with the TOA-150 telescope. The manufacturer specifies a corrected image circle of 60 mm. Field correction compensates for the field curvature of TOA telescopes; however, it does not eliminate the need to follow the specified mounting and spacing guidelines.
For the TOA-150, the manufacturer specifies a mechanical distance of 73.9 mm from the M72 output of the corrector, and 56.2 mm from the M54 output of the CA35. These distances use different reference planes: do not add them together. The table also specifies the focal length and F/D ratio obtained with this telescope.
The manufacturer's documentation specifies the M72 extension ring No. 51S for use with the TOA-150. The CA Ring35 photo ring provides an M54 output. The optical corrector is common to all TOA kits, but extension rings should not be interchanged without first verifying the assembly of the instrument in question.
| Features | Value |
|---|---|
| Resulting focal length (TOA-150) | 1,085 mm |
| Resulting F/D ratio (TOA-150) | 7,2 |
| Corrected Image Circle Diameter | 60 mm |
| MBD mechanical backfocus from the corrector (M72 output) | 73.9 mm |
| MBD mechanical backfocus starting with the CA35 (M54 mount) | 56.2 mm |
| Mechanical output interface (corrector) | M72x1 female thread |
| Mechanical output interface (CA35) | M54x0.75 female thread |
| Mechanical diameter | 78 mm |
| Mechanical length (fully assembled) | 60 mm |
| Weight (fully assembled) | 330 g |
| Reference | TKA32587S |
| Extension ring provided by the manufacturer | 51S |
Here are a few accessories we've selected for this model, depending on your needs.
Compatible scope sold separately. The 150 kit includes the M72 51S extension and the CA35 ring; check the diagram and adjust the sighting from the correct reference surface.
