The first FC-100 was released in 1981, and 38 years passed, but the Fluorite that was revolutionary at that time The F8 systems is the forerunner of photovisual refractive telescopes. Even in the current era of digital astrophotography, it is widely adopted by astronomical telescope manufacturers around the world. Combining a photography objective such as a reducer with a fluorite objective lens with little chromatic aberration Astro camera, you can enjoy both visual and photographic The idea of the founder, former Chairman Kiichiro Takahashi, is also ideal for modern astronomical users I think it looks like an astronomical telescope.

The fluorite objective lens, which was the target of 38 years ago, is now very easy to handle. It is cheaper than a triplet ED, and you can make a compact and lightweight refracting telescope. The problem is that the chromatic aberration performance is much higher in the current era of digital photography than in the era of film photography. Advanced chromatic aberration correction is required. The drawback of the doublet fluorite objective is that the spherical aberration varies widely with wavelength. In the case of a bright objective lens, especially on the short wavelength side from blue to purple. There is an increase in halo.

To optimize the balance of chromatic aberrations, including spherical aberration, in the visible range. Subtle high-order aberration to spherical aberration for each wavelength to reduce the halo on the short wavelength side, It led to an optical design that also improved the streak strength required for high magnification performance. In addition, high-refractive-index glass with good compatibility with partial dispersion is also used for the other ball of Florite. We succeeded in reducing the chromatic aberration by combining them. Thereby, the Strere intensity is 90% or more over the entire visible light region of 460 nm to 670 nm, 97.6% in Strehl ratio with visual intensity, long focus, visual performance over FC-100DL of F9 in aperture ratio of F8. It has been realized. Also, the blue-purple short-wavelength halo, which is important in digital photography, is also compared to FC-100D. It is reduced to about half. Also, with FC-35 Reducer 0.66X, it becomes an Astro camera covering the full size of 530mm F / 5.3 and if you attach the multi flatner l.04 X, 820 mm F / 8.2, A flat-field long-focus image can be obtained.

In addition, because FC-100DZ uses a slide hood, it has a more compact appeal. If you store the hood, it will be about 760 mm in length, about 3.8 kg in weight, and it is a 10 cm aperture class refractor. It is unbelievably compact, and it is an easy-carry telescopes. Thus, the FC-100DZ is the best product as a refractive telescope that can be used in various applications. It will be a standard model that will be used forever over the next 20 years and 30 years.

The first FC-100 was released in 1981, and 38 years passed, but the Fluorite that was revolutionary at that time The F8 systems is the forerunner of photovisual refractive telescopes. Even in the current era of digital astrophotography, it is widely adopted by astronomical telescope manufacturers around the world. Combining a photography objective such as a reducer with a fluorite objective lens with little chromatic aberration Astro camera, you can enjoy both visual and photographic The idea of the founder, former Chairman Kiichiro Takahashi, is also ideal for modern astronomical users I think it looks like an astronomical telescope.

The fluorite objective lens, which was the target of 38 years ago, is now very easy to handle. It is cheaper than a triplet ED, and you can make a compact and lightweight refracting telescope. The problem is that the chromatic aberration performance is much higher in the current era of digital photography than in the era of film photography. Advanced chromatic aberration correction is required. The drawback of the doublet fluorite objective is that the spherical aberration varies widely with wavelength. In the case of a bright objective lens, especially on the short wavelength side from blue to purple. There is an increase in halo.

To optimize the balance of chromatic aberrations, including spherical aberration, in the visible range. Subtle high-order aberration to spherical aberration for each wavelength to reduce the halo on the short wavelength side, It led to an optical design that also improved the streak strength required for high magnification performance. In addition, high-refractive-index glass with good compatibility with partial dispersion is also used for the other ball of Florite. We succeeded in reducing the chromatic aberration by combining them. Thereby, the Strere intensity is 90% or more over the entire visible light region of 460 nm to 670 nm, 97.6% in Strehl ratio with visual intensity, long focus, visual performance over FC-IOODL of F9 in aperture ratio of F8. It has been realized. Also, the blue-purple short-wavelength halo, which is important in digital photography, is also compared to FC-100D. It is reduced to about half. Also, with FC-35 Reducer 0.66X, it becomes an Astro camera covering the full size of 530mm F / 5.3 and if you attach the multi flatner l.04 X, 820 mm F / 8.2, A flat-field long-focus image can be obtained.

In addition, because FC-100DZ uses a slide hood, it has a more compact appeal. If you store the hood, it will be about 760 mm in length, about 3.8 kg in weight, and it is a 10 cm aperture class refractor. It is unbelievably compact, and it is an easy-carry telescopes. Thus, the FC-100DZ is the best product as a refractive telescope that can be used in various applications. It will be a standard model that will be used forever over the next 20 years and 30 years.