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Takahashi TSA-120 Apochromatic Refractor Telescope

Takahashi TSA-120 Apochromatic Refractor Telescope
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Takahashi TSA-120 Apochromatic Refractor TelescopeTakahashi TSA-120 Apochromatic Refractor TelescopeTakahashi TSA-120 Apochromatic Refractor Telescope
Takahashi TSA-120 Apochromatic Refractor TelescopeTakahashi TSA-120 Apochromatic Refractor TelescopeTakahashi TSA-120 Apochromatic Refractor Telescope
Price:  £3,836.00(Inc. 20% VAT)
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Product Code:  TTK12010
Manufacturer:  Takahashi


Optics
The TSA-120 is equipped with an apochromatic objective with triplet ED lenses of 120mm of diameter (F=900mm, F/7.7), set in a simple barrel. This barrel ensures a good stability of the opto-mechanics chain against the usual constraints of transport and against the important variations of temperature of use. The TSA-120 is proposed with a retractable dew shield.

Mechanics
The short tube of the TSA-120 facilitates its transport. It allows also the use of many kind of accessory assemblies, especially for those using important length (230mm of backfocus, see the Specifications section). The assemblies of screwed accessories, recommanded by Takahashi, are still possible (see System-charts section). However, the standard 50.8mm adapter universalizes the TSA-120 without option, even if the use of the optional camera angle adjuster (CAA) is highly recommended.

Accessories
The reading of the system-charts gives a good idea of the sphere of activities of the TSA-120. The addition of the optional field corrector allows imaging at prime focus with the F/7.5 default focal ratio. The TOA-RD reducer (F/5.6) gives to it more ease in wide field astrophotography. All the assemblies fulfill the requirements of rigidity and flexibility needed by the new imaging devices, such as the SLR/DSLR or CCD cameras.

Optical design and chromatic correction
Takahashi has developed an air-spaced ED triplet objective (3 lenses in 3 groups). This triplet consists of a lens of ED glass (S-FPL53) laid out between 2 crown lenses air-spaced by a mean chock. Alike the TOA objective, optics have been designed and calculated according to the high requirements of the current numerical imaging.

 

Configurations:

Takahashi TSA-120 (OTA) tube only, with 50.8mm and 31.75mm adapters
Item number : [TTK12010]

Takahashi TSA-120 (OTA) tube complete, with accessories

Item number : [TTK12000]
Delivered with :

    [TTK12010] - Takahashi TSA-120 (OTA) tube only, with 50.8mm and 31.75mm adapters
    [TKA00552] - 7x50 finder
    [TKA00563] - Finder bracket
    [TKA36420] - Tube holder

Spec. TSA-120
Optical design Triplet Super Apo
Optical mounting Air spaced
Glass types ED et Crown
Optical coatings Multicouche BBAR (BroadBand anti-reflection)
Aperture 120mm
Standard
Focal length 900mm
Focal ratio F/7.5
Resolution 0.97"
Visual limiting magnitude 12.1
Light grasp 293x
Image circle NA
Photo field NA
With TOA35-FL field flattener
Focal length 882mm
Focal ratio F/7.3
Image circle 40mm (60% non-vignetted)
Photo field 2.6° @ 40mm image circle
Spot sizes 7µm RMS @ center of field
7µm RMS @ 10mm off-axis
7µm RMS @ 20mm off-axis
With TOA35-RD reducer
Focal length 672mm
Focal ratio F/5.6
Image circle 40mm (60% non-vignetted)
Photo field 3.4° @ 40mm image circle
Spots size 4µm RMS @ center of field
6µm RMS @ 10mm off-axis
13µm RMS @ 20mm off-axis

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