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Refractor Toa-130Ns

Refractor Toa-130Ns

The Refractor Takahashi Toa-130Ns, Apochromatic Triplet Ortho, Offers A Very High Optical And Mechanical Quality For The Scrupulous Observer Looking For A Tool With A Good Portability.

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Refractor Toa-130Ns



New product

The Refractor Takahashi Toa-130Ns, Apochromatic Triplet Ortho, Offers A Very High Optical And Mechanical Quality For The Scrupulous Observer Looking For A Tool With A Good Portability.

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6 489,00 €

-379,00 €

6 868,00 €

Ordered upon request

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The refractor Takahashi TOA-130NS, Apochromatic Triplet Ortho, offers a very high optical and mechanical quality for the scrupulous observer looking for a tool with a good portability. It 'great to observe and photograph the solar system : images of the elusive details of the moon and planets are crisp, realistic colors and very saturated. The multi-layer coating of last generation and the number of internal baffles ensure the greatest possible contrast.
Thanks to the generous opening (130mm) and the absence of effects of diffraction has excellent performance even in the observations of deep sky objects. The double stars and globular clusters are well resolved and bright, contrasting colors of binary systems are shown clearly. The bright nebulae and galaxies set against a black sky background.
Apochromatic means "" free from false color "," an optical design that dramatically reduces the halo of purple light a fire that you can not look around the planets, the moon and the stars brighter with an achromatic refractor. Orthoscopico means "" optically correct "" and is a term usually associated with a particular type of eye notoriously known to be free from significant geometric aberrations. The series of telescopes TOA are in effect true apochromatic optical systems, with a perfect correction of false colors. Added to this is the almost total absence of optical distortions: why they are called Ortho-Apochromat to distinguish them from ordinary apochromatic refractors.
The prestigious Japanese company has developed a new triplet (3 lenses in 3 groups) spaced air , consisting of a lens ED (S-FPL53) positioned between the two lenses crown to provide very high quality images. All lens surfaces are fully multi-treated to perfection with anti-reflective material for maximum light transmission.
The color correction and contrast of refractors Takahashi matching, or exceeding, those of other systems triplet, regardless of the brand and the price, even compared to expensive systems spaced oil. The light loss is only 0.5% on each treated surface of this system air-spaced, against almost 2% on each surface of the systems spaced oil. Furthermore, maintenance is less than that required by the latter, since there is the presence of the oil that may leak or become turbid with the passage of time.
This optic allows, thanks to the particular intubation of the cell, excellent stability of the optical-mechanical in the face of setbacks and regular transport to temperature changes during use.
The cell is collimated using a collimation eyepiece type Cheshire (optional) thanks to the collimation screws placed on it. The design of the cell, combined with minimum space between the optical elements, the optics allows you to quickly reach thermal equilibrium to change the outside temperature.

E 'equipped with a focuser 2.7 "" for focusing particularly stable that used to connect heavy CCD or turrets binEyepiece. 50.8mm from the eyepiece is screwed directly to the focuser and also comes an adapter for eye / accessories 31.8mm the special locking system on the eyepiece collar chuck allows you to keep focused any accessory you mountains and avoid damaging the fittings as with the screw systems. The two large knobs for adjusting focus are easy to use even when wearing gloves and a tripod screw allows to lock the focuser in the correct firing position.
The focuser 2.7 "" ensures a circle d ' picture of 40mm allowing the photograph to direct fire with 35mm virtually free from vignetting. For those who use the medium format is a version with a new focuser 4 "" (TOA-130NFB). A tripod screw locks the focuser in the correct firing position.
A useful accessory is the photographic and visual rotator camera that is screwed to the focuser instead of the eyepiece from 50.8mm: allows you to rotate the entire system shooting up to the perfect angle to take the picture without losing the correct position of focus.
Thanks to the generous extraction fire almost 250mm back from the cell, you can use a wide variety of cameras, cameras CCDs, filter wheels, electric focusers, turrets binEyepiece.

The Strehl ratio of a telescope is a numeric value that represents the percentage of light of a star image that falls inside the Airy disk, compared to the maximum theoretical value possible (100%). A Strehl ratio of 0.95 is generally considered excellent and corresponds to an optical correction of 1 / 8lambda. A Strehl ratio of 0.978 corresponds to an optical correction of 1 / 12lambda the Strehl ratio of this optical pattern is 0.992 .

The apochromatic previous systems were optimized photographically taking into account the technologies available on the market at that time: 35mm type Kodak Technical Pan, CCD sensors smaller and less sensitive in the blue that still just beginning to enter the market. The faint bluish residual halo around the brightest stars at high magnifications also present in refractors best was not a problem.
Today the scenario of the photographic market has completely changed: the Technical Pan has all but disappeared, the CCD and DSLRs sensors have larger and larger with smaller pixels that require more stars point, either on axis or off-axis, to obtain images more realistic and accurate. The increase of sensitivity in the blue of modern CCD sensors and digital SLRs requires a drastic reduction of the residual chromatic blue around bright stars which, though invisible to the naked eye, appears very clearly when you make a shot with these systems .
The triplet Takahashi reduces deviation from green to blue to 1/3 compared to previous systems apochromatic (also fluorite). The maximum deviation of all colors to focus on the same level is not greater than +/- 0.01mm from the blue line in the H-alpha line at 436nm to 656nm. The purple glow fades chromatic aberration, and the faint remnant blue around bright stars at high magnifications essentially disappears. The stars are point-like, with diameters of 12μ in axis (within 20μ at the edges of the 35mm format). The CCD images are realistic, sharp, visual observation is extremely bright and sharp.

View the data sheet for more information. "

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