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貨號: T-C-91-BR-Refurbished

[整修品] Cat 91 WIFD

促銷價$1,888.00 USD 未含稅 原價$2,598.00 USD
省下 27% ⛟ 免運費 訂單超過 $498 即可免運費。不包含進口稅費。
Condition:

Near Mint – Almost Like New

Warranty:

One-Year Warranty with Official Warranty Card

商品簡介
商品簡介

Step up your astrophotography game with the William Optics RedCat 91, an advanced apochromatic refractor tailored for full-frame and medium-format cameras. This latest addition to the RedCat series combines portability with superior optical performance, making it a versatile tool for capturing breathtaking detail in deep-sky objects.

Highlights:

  • Petzval Design, No Backfocus Hassles: The 5-element Petzval design eliminates the need for backfocus adjustments, providing sharp, edge-to-edge images with pinpoint stars—ideal for wide-field and detailed astrophotography alike.
  • Full-Frame & Medium-Format Ready, No Extra Flattener Needed: With a large 50mm image circle, the RedCat 91 is perfect for both full-frame and medium-format cameras. Its advanced optics achieve flat-field images without requiring an additional flattener, giving astrophotographers the freedom to capture expansive views with unparalleled clarity.
  • Fast f/4.9 Focal Ratio: The RedCat 91's fast f/4.9 focal ratio is designed for bright, vivid captures of galaxies, nebulae, and beyond, ensuring excellent light-gathering power and sharp detail even on faint celestial objects.
  • Seamless WIFD Focusing: Equipped with William Optics' WIFD focuser, the RedCat 91 provides precise, stable focusing without additional adjustments, enhancing the ease of use for both seasoned astrophotographers and beginners.

The RedCat 91 blends the trusted RedCat heritage with William Optics’ innovative design, making it the ultimate choice for those ready to elevate their night-sky explorations.

購買須知
購買須知

Astrophotography Only
This telescope is specifically designed for astrophotography, and its optical design does not support visual observation.

Tension screw
When using the telescope with the motor, please ensure that the tension screw is not over-tightened. Over-tightening the tension screw may cause damage to the focuser.
Think of it like driving a car and pressing the gas pedal while also pressing the brake simultaneously. Just as this action could harm your car's systems, over-tightening the tension screw could compromise the functionality of your telescope's focuser.

Color:究極黑
[整修品] Cat 91 WIFD
[整修品] Cat 91 WIFD 促銷價$1,888.00 USD 未含稅 原價$2,598.00 USD

完整配備內容

主鏡本體

魚骨對焦罩

M48, M54
相機接環

Vixen 鳩尾板

筒箍環 & 導星握把

增高節

便攜軟袋

內六角扳手組

首款承載中片幅靈魂的貓

Cat 系列的新世代之作,結合輕量設計與旗艦級光學表現,為全片幅與中片幅攝影者開啟捕捉深空細節的全新境界。


進階 Petzval 光學設計

William Optics 研發的創新五片式 Petzval 光學系統,重新定義了望遠鏡的成像品質。此進階設計在中片幅影像圈內達到完美點像圖,確保邊緣至中心皆維持卓越銳利度與平場表現。

超低色散光學元件 (ED)

鏡組內含兩片 Super ED、 一片 ED 以及鑭系玻璃鏡片,並施以高階全多層鍍膜。此組合可有效抑制色差,呈現真實飽和的色彩與極致銳利度。

無需平場鏡

Petzval 結構天生具備平場特性,無須額外搭配平場鏡,即可獲得平整、無像差的影像,簡化拍攝流程並提升操作效率。

Never easier to capture deep sky objects

Loading Sky Viewer...
UC91 - California - Peter Zelinka

California Nebula

Peter Zelinka

UC91 - Clamshell - Jonathan

Sh2 119 - The Clamshell Nebula

Jonathan

UC91 - Corona - Daemon de Chaeney

Corona Australia Molecular Cloud & NGC 6723

Daemon de Chaeney

UC91 - HorseHead - Mehmet Ergün

M20 & M8 Wide Field

Mehmet Ergün

UC91 - Jellyfish - Peter Zelinka

Jellyfish Nebula

Peter Zelinka

UC91 - NGC2237 - Reynold Edwards

NGC 2237 Rosette

Reynold Edwards

UC91 - NGC224 - Reynold Edwards

Andromeda

Reynold Edwards

UC91 - Omega - Jakub Korbel

Omega Centauri

Jakub Korbel

UC91 - Ophiuchi - Jakub Korbel

Rho Ophiuchi Region

Jakub Korbel

UC91 - Sadr - Peter Zelinka

Sadr Region

Peter Zelinka

UC91 - Soul - Peter Zelinka

Soul Nebula

Peter Zelinka

支援電動對焦配件

使用內建機構輕鬆安裝,無需額外的支架套件。

領先市場

William Optics 原創專利設計

Cat 91 集結三項 William Optics 專利技術,實現流暢精準的對焦體驗與完美同軸成像,徹底消除光軸偏移導致的拉筒傾斜,展現專業級光學穩定性。

:

WIFD 中置式對焦設計

WIFD 將對焦系統置於鏡筒中央,以平衡結構徹底解決因相機與配件重量導致的傾斜現象,確保操作穩定與成像精準。

內建式魚骨對焦罩

採用高解析、穩定的光學級 PMMA 材質,經雷射雕刻而成,可快速、精準地完成對焦,讓天文攝影更輕鬆順暢。

CAT 導星提手握把

精心打造的鋁合金導桿手把兼具便攜性與多功能性,讓架設與移動更加便利。

筒箍環

以寬面接觸設計確保穩定性,同時維持輕巧靈活。創新的結構讓設備能快速拆裝,兼顧穩固與操作效率。

貼心設計,精準到位

高精度影像校正結構

像場傾斜調整器

內建像場傾斜調整機構,可輕鬆修正相機感光元件的傾斜問題,確保影像場平整一致。

像場旋轉環

可快速修正角度誤差,並靈活調整拍攝構圖,輕鬆獲得理想的取景方向。

成像展示

左右滑動,查看原始影像與處理後結果。

原始

處理後

使用左右箭頭鍵在 before 和 after 圖片之間導航。

▲ IC434 (APS-C)

Cat 91 + ZWO ASI 2600MC Duo
Mehmet Ergün 提供

  1. 疊圖結果(原始影像和處理後影像)
  2. 單張角落星點表現

▲ M45 (全片幅)

Cat 91 + ZWO ASI 6200MC Pro
由 賴小熊 提供

  1. 疊圖結果(原始影像和處理後影像)
  2. 單張角落星點表現

Reviews

William Optics RedCat 91 Review

I recently tested the William Optics RedCat 91 APO refractor. This is the fourth RedCat I’ve used in the RedCat series—five if you count the two versions of the RedCat 51 (version 1 and version 3).
With a healthy aperture, fast optics, and a super flat Peztval design, the William Optics RedCat 91 has a lot going for it. It includes several thoughtful features, such as a tilt adjuster, a camera angle rotator, and a robust WIFD focuser.
This telescope has two color options: the classic red and a new black version. William Optics sent me the black one and explained that it’s one of the best telescopes he’s ever produced.