William Optics Fluorostar 156 APO Red (AKA FLT 156, SKU: A-F156-RP37)

The William Optics Fluorostar 156 APO is a remarkable optical instrument specifically designed for astrophotography, delivering unparalleled image quality while minimizing chromatic aberration and distortion. With meticulous attention to detail and the use of premium materials, the engineers and designers at William Optics have created a refractor that sets a new standard for excellence, rivaling even the most sophisticated and expensive models available today.

At the core of this refractor lies an apochromatic triplet optical system, featuring lenses crafted from FPL-53 glass and lanthanum glass. The FPL-53 glass, produced by the renowned Japanese company Ohara, has established itself as the gold standard for top-tier optical materials, primarily due to its remarkable Abbe number of 94.49. By incorporating elements made of lanthanum glass, which works in tandem with FPL-53 glass, the Fluorostar 156 APO achieves even further reduction of chromatic aberrations. Additionally, every lens is coated with a multi-layer anti-reflective coating, ensuring sharp and high-contrast images.

The large diameter of the illumination disc makes this refractor perfectly suited for use with full-frame sensor cameras and APS-C matrix cameras.

Important Note: To compensate for temperature fluctuations, the Fluorostar series refractors are equipped with steel lens mounts. When preparing the telescope for storage, it is crucial to remove the lens hood and allow any moisture inside to evaporate. Subsequently, store the instrument in a dry room with a consistent room temperature to prevent potential corrosion on the lens mounts.

Key Features:

• Apochromatic triplet optics made from lanthanum glass and FPL-53 glass, coated with a multi-layer anti-reflective coating.

• CNC technology used for precision manufacturing of the fasteners.

• 3.7" rack & pinion focuser designed to work seamlessly with the 3" flattener.

• Innovative Bahtinov mask design and mount, patented by William Optics.

• Full illumination ring ensures complete coverage of the full-frame sensor.

• Losmandy rail 300mm mounting system, with adjustable spacing on the edges to facilitate repeated assembly with proper balance.

• Triple tube clamps for enhanced stability and user comfort.

• The guider foot on the tube clamps serves as a handle for easy transportation.

Technical Specifications:

• Optical system: ED-APO apochromatic triplet.

• Objective diameter: 156mm.

• Focal length: 1228mm.

• Aperture ratio: f/7.8.

• Resolving power: 0.88".

• Star range: 12.8 mag.

• Maximum useful magnification: 312x.

• Lens materials: FPL-53 glass (Ohara, Japan), lanthanum glass.

• Anti-reflective coating: Full multi-layer coating.

• Full illumination circle diameter: Compatible with full-frame sensors.

• Compatible sensor sizes: APS-C, full frame.

• Compatible photographic systems (via interchangeable T-rings): Canon EF, Nikon F, Sony E, Pentax, Micro 4/3, Fuji FX.

• Focuser: 3.7" rack & pinion.

• Recommended flatteners: WO Flat 68III 3", Flat 7A x0.8 3", Flat 8 x0.72 3".

• Finder foot: Vixen.

• Mounting for mounting: Losmandy standard rail.

• Folded tube length: 1120mm.

• Extended tube length: 1330mm.

• Tube weight: 17kg.

Kit Components:

• William Optics Fluorostar 156 APO refractor with R&P focuser.

• Lens hood.

• Bahtinov mask with fastening mechanism.

• Mounting bracket.

Warranty:

This product is backed by a 24-month warranty.