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Item number : [TOK15010]
Retractable dewshield, 4" rack-and-pinion focuser et CAA
| Optical design | Triplet Ortho Apochromatique |
| Optical mounting | Air spaced |
| Glass types | SD/ED |
| Optical coatings | Fully Multi-Coated |
| Aperture | 150mm |
| Resolution | 0.77" |
| Visual limiting magnitude | 12.7 |
| Light grasp | 459x |
| Standard | |
|---|---|
| Focal length | 1100mm |
| Focal ratio | F/7.3 |
| With TOA-FL35 flattener | |
| Focal length | 1080mm |
| Focal ratio | F/7.2 |
| Image circle | 40mm |
| With TOA-FL67 flattener | |
| Focal length | 1090mm |
| Focal ratio | F/7.3 |
| Image circle | 90mm (60% non-vignetted) |
| With TOA-RD reducer | |
| Focal length | 860mm |
| Focal ratio | F/5.7 |
| Image circle | 50mm (60% non-vignetted) |
| With Extender-TOA 1.6 | |
| Focal length | 1760mm |
| Focal ratio | F/11.7 |
| Image circle | 40mm |
| Spec. | TOA-150 |
|---|---|
| ***Retractable dew-shield | |
| Rack-and-pinion focuser diameter | 101.6mm |
| Tube length (mini/maxi) | 1100mm-1290mm (with standard accessories)*** |
| Tube diameter | 179mm |
| Tube weight | 14.6 kg (balancing couterweight cradle : 4.8 kg) |
The objective of TOA-150 (D=150mm, F=1100mm, F/D 7,3) is an air-spaced triplet of which two of the lenses consist of ED glass with very weak chromatic dispersion. Its optical design, that has gone through many years of R&D experiences, is a state-of-the-art. Due to its fast focal ratio, Takahashi engineers had to optimize the space between the lenses in order to minimize chromatic and geometric aberrations. The objective is assembled in a precise mechanical barrel, entirely adjustable. Collimation is easy to realize and makes it possible to adapt perfectly optical requirements to the conditions of observation or imaging. The tube has a retractable dew shield.
As on the TOA-130F, the rack-and-pinion focuser has been reinforced and oversized, first to take completely advantage of the field of full light (90mm with the #67 field corrector !), to ensure a perfect rigidity of all the assemblies attached at prime focus and also to balance the tube, taking into account the very important weight of the objective. A balancing cradle, equipped with a handle, has been added to fulfill this function. The focuser is equipped with a camera angle adjuster for photo framing. The focuser can be equipped, in option, with a microreducer.
The range of accessories for TOA-150 refractor is extremely large, for both optical (field flatteners, reducers or multipliers of focal length) or mechanical (extension tubes, photo adapters, etc…) purposes. No matter what end-users needs are, visual or photographic, this large range of accessories will satisfy them. Please refer to system-charts for
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