This Takahashi refractor optical tube has:
• 130mm f/7.7 Ortho-Apochromat ED triplet optics
• 4” rack and pinion focuser with 2” and 1.25” eyepiece adapters
• retractable dew shield
• camera angle adjuster
• 250mm of back focus for CCD and medium format film imaging
• state-of-the-art optical performance, exceeding even fluorite scopes
• 5-year warranty
The Takahashi TOA-130F refractor provides exceptionally high optical
and mechanical quality for the serious visual and photographic observer
who needs optics of reasonable portability. The TOA-130 is exceptional
for observing and imaging within the solar system. Its images of subtle
lunar and planetary details are sharp, with realistic and highly
saturated color. They are free from chromatic aberration’s violet haze
of spurious color, thanks to the scope’s ED triplet optics. The latest
antireflection multicoatings and numerous knife-edge internal baffles
assure the maximum image contrast possible.
This 5.1” Takahashi has a
large aperture and diffraction-free images that make it surprisingly
good for much deep space observing, as well. Binary stars and globular
star clusters are particularly well-resolved and vivid, with the
contrasting colors of many binary systems showing nicely. The brighter
nebulas and galaxies stand out against a very dark sky background. Its
4” focuser permits medium format imaging of a huge 5.3° swath of the sky
with pinpoint images when using an optional focal reducer.
TOA-130’s f/7.7 focal ratio and 1000mm focal length is long enough,
using a Takahashi 2.8mm ED eyepiece to provide 357x, for high
magnification observations of the Moon and planets, yet it will also
produce a huge 2.5° field at 20x, using a 2” Takahashi 50mm eyepiece.
This Telescope’s Optical and Mechanical Systems . . .
- Apochromatic triplet ED refractor optics: .1”
(130mm) aperture, 1000mm focal length, f/7.7 Ortho-Apochromatic triplet
lens using an FPL-53 ED (Extra-low Dispersion) glass element between
two crown glass elements for images that are free from spurious color
(chromatic aberration). For more details, click on the “Takahashi triplet lens” icon above.
- Multicoated optics: Fully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.
- Retractable dew shield: Slows
the formation of dew on the lens to extend your undisturbed observing
time. Also improves visual and photographic contrast by shielding the
lens from off-axis ambient light (the neighbor’s yard light, moonlight,
etc.) For transport, the retractable lens shade keeps the overall length
of the optical tube to a manageable 32” when it is retracted and the
visual extension tube removed.
- Rack and pinion focuser: 4”
focuser, with a 2” eyepiece/accessory holder that threads into the
camera angle adjuster attached to the focuser drawtube. A 1.25”
compression ring eyepiece/star diagonal holder is also supplied. The
non-marring soft nylon compression ring of the 1.25” eyepiece holder
won’t scratch the barrels of your accessories or star diagonal, as
ordinary thumbscrews can. Dual focusing knobs provide precise image
control with either hand. The large focus knobs are easy to operate,
even while wearing gloves or mittens in cold weather.
focuser yields a 92mm image circle for medium format prime focus
photography with a Mamiya 645 or Pentax 6x7 camera. Needless to say, the
92mm image circle also allows absolutely unvignetted imaging with 35mm
film cameras and the new 35mm-size and larger CCD chips. A large
thumbscrew locks the focuser tube in place without image shift at the
correct photographic focus.
The built-in camera angle adjuster
allows the photographic accessory train to be rotated to the most
appropriate angle to frame the object being photographed (a landscape
format, portrait, or any angle in between) without having to loosen the
camera adapter and perhaps lose the correct focus. Once the camera is
oriented correctly, a large knob on the side of the adjuster can be
tightened to hold the camera in place during the exposure.
- Finderscope mounting point: No
finderscope is supplied, but a flat boss with two mounting bolt holes
is provided on the top of the focuser body for mounting an optional
finderscope. The Takahashi 7x50mm 6.2° field finder and bracket shown
below are recommended.
- Long back focus: Back
focus is a very good 250mm, allowing the stacking of a wide variety of
CCD cameras, color filter wheels, electric focusers, and film cameras.
- Optional photographic accessories: Three
accessories are available to provide a variety of image scales and sky
coverage: a field flattener, a focal reducer, and an extender. The field
flattener reduces the focal ratio slightly (to f/7.68) and gives
pinpoint stars to the very edges of the 92mm (5.3° field) image circle
for unvignetted medium format (6x7cm) and 35mm images. The central 70mm
of the field is fully illuminated, with a gradual falloff to 85%
illumination at the edges of the field. The focal reducer effectively
cuts the focal length to 750mm and the focal ratio to f/5.76. The
photographic field is now 3.8°, spread over a 50mm image circle for
totally non-vignetted 35mm photography. A 1.6x extender (which can also
be used visually) effectively increases the focal length to 1600mm and
the focal ratio to f/12.3. The photographic field is 1.4° with this
extender in use. A variety of photographic coupling attachments and
eyepiece projection photography adapters are also available.
- Mounting rings: No
mounting rings are supplied for the 155mm diameter optical tube. Two
options are available. One is the Takahashi tube holder (#130TH) shown
below that is designed specifically for mounting the TOA-130 on a
Takahashi EM-200 or larger equatorial mount. The second option is a pair
of Parallax split mounting rings (#PFS152), also shown below, for
mounting on a non-Takahashi mount, such as a Losmandy G-11.
image above shows the scope with an optional 7 x 50mm finderscope and
finder bracket. The feature image below shows the rear cell of the 4”
focuser scope as supplied, with its attached standard equipment camera
angle adjuster and without the optional finderscope.
Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .