Takahashi TSA-120 120mm (4.7") Triplet Apochromat Optical Tube Assembly with FT Focuser

Description

The TSA series is a member of Takahashi’s line of triplet refractors. In the TSA design, an ED glass lens is placed between two lenses, with air spacing in between. The resulting system achieves a high level of apochromatic performance for both visual observation and imaging.

TSA-120

The TSA-120 is a 120 mm apochromatic f/7.5 refractor with a focal length of 900 mm. It features a retractable lens hood and a 2.7 inch rack and pinion focuser. The TSA is compatible with several flatteners, reducers and extenders, including the TOA-35 Reducer, which converts the telescope to a f/5.3 imaging platform with a 44 mm image circle.

Optical Tube Assembly only (mount, tripod, tube holder and finder sold separately).

Tube Weight of the OTA is only 12.5lbs!

Second TSA triplet apochromat
Very high order of color correction
Compact design only 28” long collapsed
Long back focus 227mm [8.93”] to accommodate bino viewers and any 2” diagonal
Supplied with 2” and 1/1/4” accessories and extension tubes
Quick release finder bracket included
Knife edge baffles are standard for highest contrast

The TSA-120 is the second triplet apochromat in the TSA Series. Its superb color correction will provide high contrast images with pin point stars across the field.

The compact size of 28” allows the TSA-120 to be easily transported to remote sites.

The TSA-120 is a great scope for imaging. The TOA 35 flattener converts the 120 into an f/7.3 882mm flat field 2.6º instrument and the reducer changes it to an f/5.6 672mm

Specifications

Aperture	120mmø
Focal Length	900mm
Focal Ratio	F/7.5
Optical Design	Triplet ED apo
Coating	Broad band multi-layer anti-reflection

Mechanical Specs

Diameter of main tube:	125mmø
Diameter of dew shield [sliding]:	713mm <-->[28”]
Weight of OTA	7 kgs/15.4 lbs
Back focus:	227.5mm [8.93”]

TOA-35 Flattener

Focal Length	882mm
Focal Ratio	f/7.3
Optical performance	7 micron RMS-spot to 20mm off-axist
Image Circle:	40mmø
Image Field:	2.6ºø diameter

TOA-35 Reducer

Focal Length	672mm
Focal Ratio	f/5.6
Optical performance	4 microns RMS-spot on axis 6 microns 10mm off-axis 13 microns 20mm off-axis 40mmø/3.4º field

TSA-120 System Chart In the Box Tube assembly MEF fine focuser Finder quick release bracket 2” compression ring ocular adapter 1 ¼” compression ring adapter w/ coupling 2 ea. 72mm extension tubes Metal focuser rear cover and 2” sleeve Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .
Terrestrial Observation: Observing terrestrial objects (nature studies, birding, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial observing. Scopes with apertures under 5" to 6" are generally most useful for terrestrial observing due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes.	No
Lunar Observation: Visual observation of the Moon is possible with any telescope. Larger aperture scopes will provide more detail than smaller scopes, thereby getting a higher score in this category, but may require an eyepiece filter to cut down the greater glare from the Moon's sunlit surface so small details can be seen more easily. Lunar observing is more rewarding when the Moon is waxing or waning as the changing sun angle casts constantly varying shadows to reveal craters and surface features by the hundreds.	Great
Planetary Observation:	Very Good
Binary and Star Cluster Observation:	Very Good
Galaxy and Nebula Observation:	Good
Photography:	Yes
Terrestrial Photography: Photographing terrestrial objects (wildlife, scenery, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial photography. Scopes with focal ratios of f/10 and faster and apertures under 5" to 6" are generally the most useful for terrestrial photography due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes.	No
Lunar Photography: Photography of the Moon is possible with virtually any telescope, using a 35mm camera, DSLR, or CCD-based webcam (planetary imager). While an equatorial mount with a motor drive is not strictly essential, as the exposure times will be very short, such a mount would be helpful to improve image sharpness, particularly with webcam-type cameras that take a series of exposures over time and stack them together. Reflectors may require a Barlow lens to let the camera reach focus.	Yes
Planetary Photography:	Yes
Star Cluster / Nebula / Galaxy Photography:	Yes

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Takahashi TSA-120 120mm (4.7") Triplet Apochromat Optical Tube Assembly with FT Focuser

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TSA-120 System Chart

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