Vixen FL55SS fluorite doublet apochromatic refractor telescope with Flattener HD included

Kit composed by the Vixen FL55SS fluorite doublet apochromatic refractor and dedicated Flattener HD corrector that transform this telescope into a 55 mm F/5.7 (312 mm focal length) astrograph for wide field imaging. EX 66 extension tube included.

If you have a Canon EOS DSLR we highly reccomend the Canon EOS 60DX adapter (#VX-38751). Adapter must be mounted after EX 66 extension tube.

If you want to use a CCD or CMOS camera you can ask for a custom adapter. Metal back distance from the EX 66extension tube is 63.5 mm, thread M60x1.

Vixen FL55SS fluorite doublet apochromatic refractor telescope

The Vixen FL55 apochromatic refractor is completely made in Japan and delivers an high quality fluorite (CaF2) doublet lens with 55 mm of aperture and 303 mm focal length (focal ratio F/5.5). You will find the best optical quality as usually delivered by Vixen along a sturdy yet light optical tube. Weight of the optical tube is 1.5 Kg only!

A new apochromatic refractor with high-performance objective lens made of mineral fluorite crystal (CaF2) able to reproduce extremely clear and sharp image by extraordinary eliminating color aberration.

Optical tube is very compact (282 mm length) and light (1.5 Kg) but offers a sturdy focuser able to hold also big and bulky DSLR such as a Canon 5D Mark IV. Dedicated photographic accessories transforms the Vixen FL55SS in a fantastic astrograph corrected up to the full-frame image format (image circle 44 mm) with very high correction and limited vignetting.

Using the dedicated 1.04x Flattener HD the FL55SS transforms into a 55 mm F/5.7 astrograph (312 mm focal length). Adding also the dedicated 0.79x Reducer HD the system turns into a very wide field astrograph with F/4.3 focal ratio (237 mm focal lenght). Vignetting at the edge of the 44 mm corrected image circle is 96% and 86% respectively.

Features

• Optical Design: Apochromatic Refractor with fluorite lens doublet (CaF2)
• Aperture: 55 mm
• Focal Length: 303 mm
• Focal Ratio: F/5.5
• Coating: Multi Coating
• Resolving Power: 2.11 arc sec
• Limiting Magnitude: 10.5
• Light Gathering Power: 62x
• Astrophotography: optional Flattener HD and Reducer HD available
• Visual Back: 1.25"
• Optical Tube Length: 282 mm
• Optical Tube Diameter: 80 mm
• Outside Dew Shield Diameter: 80 mm
• Optical Tube Weight: 1.5 Kg
• Included Accessories: Dovetail Plate; Extension tube; M60 focuser; 1.25" eyepiece holder adapter;
• Made in Japan

System Chart

Spot diagrams Vixen FL55SS

Spot diagrams Vixen FL55SS + Dedicated Flattener HD

Spot diagrams Vixen FL55SS + dedicated Flattener HD + dedicated Reducer HD

Vixen Flattener HD Kit for Vixen FL55SS fluorite apochromatic refractor

The Vixen Flattener HD Kit for Vixen FL55SS apochromatic refractor includes the Flattener HD field flattener for FL55SS and the EX Tube 66 extension tube.

It is complete correcting lens system for Vixen FL55SS fluorite apochromatic refractor designed to work with digital cameras or CCD/CMOS up to full-frame format (24x36 mm). Transforms the Vixen FL55SS into a 4-lenses flat field astrograps capable to cover very large fields.

Using the Flattener HD on the Vixen FL55SS optics you will get a corrected image circle of 44 mm with the highest edge illumination possibile. The field flattener enlarge focal length by 1.04x delivering a focal lenght of 312 mm (focal ratio becomes around F/5.7), with an edge illumination up to 96%. A very high value indeed that testify the careful design Vixen optical engineers did on this marvellous optics.

Vixen AS Coating

All the new high performance correctors by Vixen include the highly renowned Vixen AS Coating that ensures over 99.9% light transmission for each optical surface. It is the same coating used also in the Vixen flagship VSD 5-lens astrograph. This advanced coating cuts down to a negligible effect any possibile loss of light and any ghost or flare image.

Flattener HD for FL55SS specifications

Vixen FL55SS Spot diagrams

Vixen FL55SS spot diagrams at prime focus without correctors (F/5.5)

Vixen FL55SS spot diagrams at prime focus with Flattener HD for FL55SS field flattener (F/5.7)

Example images

The Veil nebula complex in Cygnus taken with Vixen FL55SS and Flattener HD for FL55SS field flattener

System Chart