Apochromatic refractors


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Takahashi TOA-130NFB refractor




Version Nfb Has Focuser 4" "Similar To That Used On Fsq106Ed.

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

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8 895,00 €

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Takahashi TOA-130NFB refractor

Version NFB has focuser 4" "similar to that used on FSQ106ED!

The refractor Takahashi TOA-130NFB, Apochromatic Triplet Ortho, offers' ultra high optical and mechanical for the scrupulous observer looking for a tool with a good portability. It 'great to observe and photograph the solar system, the images of the elusive details of the moon and planets are crisp, realistic colors, highly saturated and free from chromatic aberrations. The multi-layer coating of last generation and the number of internal baffles ensure the greatest possible contrast.
This tool 130mm thanks to generous openness and the absence of effects of diffraction has excellent performance even in the most of the observations of deep sky objects. The double stars and globular clusters are well resolved and bright, contrasting colors of binary systems appear clearly. The bright nebulae and galaxies stand out against a black sky background.
Apochromatic means "" free from false color "," an optical design that dramatically reduces the halo of purple light-focus that can be observed around the planets, to the edge of the moon and all 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 geometrical aberrations significant.
The series of telescopes TOA I am all effects of real 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.
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 two lenses crown to provide the highest quality images. All optical 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 brand and 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 4 "" 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 4 "" allow the photographer to average format using the superb photographic field of 5.3 ° and the image circle of 92mm of course the photograph with a 35mm camera is completely free of vignetting.
The standard is expected rotator camera, visually and photographically useful: you can rotate the entire camera system to reach the perfect angle to make the photography without losing the correct position of focus (knob lock).
Thanks to the generous extraction fire almost 250mm back from the cell, you can use a wide variety of cameras, CCD cameras, filter wheels, focusers electrical towers 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 possible theoretical value (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, smaller CCDs 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.

Data sheet in PDF format. "

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