TAKAHASHI TOA-150B ORTHO-APO TRIPLET
Takahashi
Ortho-Apochromatic triplet
15.2 kg
TAKAHASHI TOA-150B ORTHO-APO TRIPLET - OTA Only is backordered and will ship as soon as it is back in stock.
In stock now!
The Takahashi TOA-150B is an Ortho-Apochromatic triplet refractor with the highest possible correction of any refractor on the market. The unique optical configuration based on a highly air-spaced triplet completely eliminates spherical aberration while having the best chromatic correction in the Takahashi range. With two S-FPL53 ED elements, the air-spaced triplet lens cell has a Strehl ratio of 99.8% at the optimal wavelengths of human vision.
The TOA-150B is equipped with an oversized 4" rack and pinion focuser with a precise 1:7 microfocuser, CAA camera angle adjuster for photographic framing, FQR-1 base for 7 x 50 finderscope (finder not included) and a retractable dew shield.
The TOA-150B has a native focal length of 1100mm and a focal ratio of f/7.3, making it the ideal instrument for capturing a wide range of deep sky objects such as planetary nebulae and galaxies. Due to its extraordinary correction, the TOA-150 also excels at high resolution planetary imaging.
Typical apochromatic refractors are corrected for chromatic aberration at the expense of increasing spherical aberration at certain wavelengths. The TOA's unique design eliminates this problem, with less than 0.01mm focal shift across the visible spectrum - 1/100th less aberration than typical apochromatic designs!
A selection of different field correctors are available to suit different applications (sold separately). With the optional TOA-35RD focal reducer, the telescope is transformed into a full-frame capable astrograph with a large 44mm image circle. For even larger sensors, the TOA-645 field flattener provides a corrected image circle of 90mm, making it suitable for use with the largest sensors available.
In addition, a 1.5x focal extender is available, also corrected for full-frame sensors with a 44mm image circle.
For serious imaging, the Prima Luce Lab Esatto 4" robotic microfocuser is compatible with an additional adapter. NOTE: Use of the optional focal reducers will likely require a custom adapter for the Esatto. Please contact us for more information.
Note: The OTA ONLY variant does not include tube rings or a dovetail bar. For the TOA-150B, you can use the PrimaLuceLab 180mm PLUS tube rings in combination with the PrimaLuceLab 350mm Losmandy bar.
Specifications
| Optical design | Ortho-apochromatic triplet with ED glass |
|---|---|
| Lens cell |
Highly air-spaced triplet with 3 lenses in 3 groups, 2 x S-FPL53 lenses |
| Coatings |
Hard multicoatings |
| Objective diameter |
150 mm |
| Focal length at prime focus |
1100 mm |
| Focal ratio at prime focus |
F/7.3 |
| Backfocus distance at prime focus |
275 mm |
| Dew shield diameter | 206 mm |
| Tube diameter | 179 mm |
| Tube length | 1270 mm with dew shield extended, 1110 mm with dew shield retracted |
| Tube weight | 15.2 kg |
| SKU | TOK15110 |
Measurements
| Prime focus focal length | 1100 mm |
|---|---|
| Prime focus focal ratio |
F/7.3 |
| Prime focus backfocus distance |
275 mm |
| TOA-35FL flattener focal length |
1080 mm |
| TOA-35FL flattener focal ratio |
F/7.2 |
| TOA-35FL flattener backfocus distance |
117.5 mm |
| TOA-35FL flattener image circle |
40 mm |
| TOA-645 flattener focal length | 1085 mm |
| TOA-645 flattener focal ratio | F/7.2 |
| TOA-645 flattener backfocus distance | 73.9 mm (from M72 x 1 thread), 56.2 mm (from CA35 ring with M54 x 0.75) |
| TOA-645 flattener image circle | 90 mm |
| TOA-35RD 0.7x reducer focal length |
775 mm |
| TOA-35RD 0.7x reducer focal ratio |
F/5.2 |
| TOA-35RD 0.7x reducer backfocus distance |
62.5 mm |
|
TOA-35RD 0.7x reducer image circle |
44 mm |
| EXT-ED 1.5x extender focal length | 1650 mm |
| EXT-ED 1.5x extender focal ratio | F/11 |
| EXT-ED 1.5x extender backfocus distance | 117.5 mm |
| EXT-ED 1.5x extender image circle | 44 mm |
Downloads
 TOA-150B instruction manual
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Optical design
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Aperture
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Focal length
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Focal ratio
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Weight
