品名 Pentax 100 SDUF II 平場APO折射鏡
口徑 100mm、焦距 400mm (焦比 F4)
調焦 旋進式，最小讀數20微米、最小調焦精確度10微米
先上圖片其餘細節稍後發報，包括目視報告、像場星點比較等，例如：
- 與頂級三枚玉APM-TMB APO折射鏡目視對比
- 全口徑及收細光圈下的星點表現
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厰方公佈資料：
The Pentax 100 SDUF II is an ultra fast flat field APO refractor that is designed for wide field imaging with large format CCD and film camera's.
Features SDP 4-lens/two group design with integrated corrector which offers excellent image quality over the entire field of view and very good colour correction for such a fast instrument.
Precision helical focuser with scale.
Clear aperture of focuser is 83mm, which easily covers a large 6 X 4.5 film format.
The 4-element, 2-group design of the Pentax 100 SDUF II was created to produce excellent image quality over the entire field of view. The front element in the first doublet is made of SD glass, and a two-lens integrated corrector contributes to a flat field that is especially noticed (and appreciated!) when used photographically. This configuration, along with the addition of state-of-the-art internal baffling, yields images of excellent contrast and detail, with great color correction, even at high magnifications. Special multi-coatings designed to increase the transmission of astronomical wave lengths are used on all Pentax APO telescopes.
The drawtube has an inside diameter of 88mm, and fully illuminates 6 X 4.5 format with ease. The helical focuser includes a scale that allows precision focus to 0.02mm or better with a large knurled ring that fits the hand comfortably.
Telescope Type: SDUF II Apochromatic Refractor Lens Design: 4 elements, 2 Groups Coatings: SMC Multi-Coatings Aperture: 3.9" (100mm) Focal Length: 15.7" (400mm) F/Ratio: 4 Image Circle: 88mm Drawtube Inside Diameter: 3.3" (83mm) Resolution: 1.16 seconds Visual Limiting Magnitude: 11.7 Light-Gathering Power: 204× Tube Diameter: 4.5" (115mm) Tube Length: 19.37" (492mm)
Optional Accessory: Pentax 100 SDUFII Tube Bracket
