Sebastian Ś. | 09 Mar 2023, 09:59
Sebastian Ś. | 15 Lip 2023, 22:28
Człeko napisał(a):Takahashi wprowadza nową serię okularów - https://www.starbase.co.jp/SHOP/TS-A243.html
The TPL series is a standard eyepiece that succeeds the discontinued Abbe series and LE series. After repeated verification of various types of eyepieces, Takahashi's original Procell type eyepiece, which is the best in its class, was completed. Using high-refraction and low-dispersion glass, the chromatic aberration at the center is about half that of the Abbe series and about two-thirds that of the LE series. In addition, the entire surface of the lens is coated with a multilayer coating that transmits more than 99% of all visible light, and the metal construction prevents stray light from entering. . It is a high-performance eyepiece made in Japan that can bring out the performance of high-performance objective lenses.
Up to now, we have been selling standard eyepieces with an apparent field of view of about 50°, including the Abbe series with a 4-piece configuration and the LE series with a 5-piece configuration.
In launching these successors, which have been discontinued, we have worked on a new design, repeatedly verified afocal calculations with various types of eyepieces, and completed Takahashi's original Prossell type eyepiece, which is the best in its class. rice field. There are many eyepieces with the name "Procel" on the market, but they are a mixture of gems and stones, so unless you actually look into them, you can't judge them by the name "Procel". The newly released TPL series uses high-refraction and low-dispersion glass, and the chromatic aberration in the center is about half that of the Abbe series, and about 2/3 that of the LE series. I'm here.
In addition, the entire surface of the lens is coated with a multi-layer coating that transmits more than 99% of the entire visible light range, and the hardware structure prevents stray light from entering in here.
With this type of eyepiece without a Smyth lens, the Petzval sum cannot be corrected to zero, so the star image up to the field ring cannot be a perfect point image. Aberration and curvature of field are controlled. It is extremely sharp from the center to the half of the field of view, and the star image swells towards the periphery.
The peripheral star image is designed to bulge naturally, so it works well with a good barlow lens, and the entire field of view is almost flat field.
The TPL-12.5, TPL-18, and TPL-25 to be released this time also inherit the style of the Takahashi 31.7 eyepiece, so they are parfocal to the existing eyepieces, and also adopt a rubber eyepiece that can be folded back when wearing glasses. I'm here.
The Takahashi TPL series is a high-performance eyepiece made in Japan that brings out the performance of high-performance objective lenses. This is a gem that TOA and Mewlon-CRS users should definitely try.
Sebastian Ś. | 25 Lip 2023, 19:31
