Reducer HD5.5 and Flattener HD for FL55SS

■ Upgrading the FL55SS fluorite refractor into high-performance astrograph

The kit consists of the high performance flattener lens, reducer lens and connecting rings "EX Tube 66" designed for the FL55SS Fluorite apochromatic refractor, improving photographic performance through flattening the imaging surface dramatically.

■ Ultra sharp image over the entire imaging field of DSLR full-frame sensor

The flattener HD for FL55SS reduces a change of focal length of the FL55SS to a minimum, while improving flatteness of the surface at prime photography. The secured dia. 44mm image circle covers entire imaging field of full-frame DSLR camera. Using in combination with the Reducer HD5.5, the focal length will be reduced by 0,79x(from F5.5 to F4.3), while maintaining the image circle in dia. 44mm, largely improving sharpness over the entire imaging field of the DSLR camera with full-frame sensor.

■ Aboundant 96% volume of light to the edge of field of view

The flattener HD is specially designed for the FL55SS refractor to reduce a light loss to a minimum, successfully secured over the nearly entire image circle of 44mm dia. of the full-frame DSLR camera.

■ Extraordinary High Contrast

The same anti-reflective AS coatings, which are used for our high-end VSD100F3.8 Astrograph, are used to take advantage of 99.9% superb high light transmission per lens surface. Loss of light, ghost and flare images are substantially eliminated thanks to the perfect matt finish inside.

■ System Structure Diagram

<SPECIFICATION>

"Reducer HD 5.5" (Art.37251)

Applicable Optical Tube	Vixen FL55SS
OTA Focal Length	300mm, F/5.5
Magnification *1)	0,79x *1) In combination with the Flattnener HD
Focal Length *1)	237mm *1) In combination with the Flattnener HD
F-Ratio *1)	4,3 *1) In combination with the Flattnener HD
Image Circle *2)	Dia.44mm 2) covers full-frame sensor, 1) In combination with the Flattnener HD
Peripheral Illumination	86% (Full-frame sensor) *1) In combination with the Flattnener HD
Lens Elements	3 elements in 3 groups
Coating	AS Coating(Over 99,9% light transmission on every single surface)
Dimensions / Weight	Dia.68mmx x45.3mm /
Weight	237g

<SPECIFICATION>

"Flattener HD kit for FL55SS"(Art.37252)

Applicable Optical Tube	FL55SS Fluorite Refractor
Focal Length	300mm(F5.5) to 312mm(F5.7)
Magnification	1,04x

Weight	107g (Flattener only)
Image Circle (Dia.) *1	44mm *1)covers full-frame sensor.
Peripheral Illumination	96%
Lens Elements	2 elements in 1 group
Coating	AS Coating(Over 99,9% light transmission on every single surface)
Dimensions	-Dia. 58mm x 30mm
Accessory	EX Tube 66(Dia.68mm x76mm, 89g)

<SPECIFICATION>

"Reducer HD Kit for FL55SS"(Art.37253)

Applicable Optical Tube	FL55SS Fluorite Refractor
Focal Length	Flattener: 300mm(F5.5) to 312mm(F5.7) / 300mm(F5.5) to 237mm(F4.3)
Magnification	1,04x / 0,79x

Weight	107g / 237g
Image Circle (Dia.) *1	44mm *1) covers full-frame sensor.
Peripheral Illumination	96% (over edge of full-frame sensor.)
Lens Elements	2-elements in 1-group, / 3-elements in 3-groups
Coating	AS Coating(Over 99,9% light transmission on every single surface)
Dimensions / Weight	Dia.58mm x 30mm, / Dia.68mm x 45,3mm
Accessory	EX Tube 66(Dia.68mm x76mm, 89g),

<Features of Reducer HD Kit for FL55SS>

■ Upgrading the FL55SS Fluorite refractor into High-Performance Astrograph
The kit consists of the high performance flattener lens, reducer and the connecting ring "EX TUBE 66" designed for the FL55SS Fluorite Apochromatic Refractor, improving photographic performance through flattening surface dramatically.

■ Ultra sharp image over entire imaging field on DSLR full-format sensor
The flattener HD for FL55SS reduces a change of focal length of the FL55SS to a minimum, while improving flatteness of the surface at prime photography. The secured dia 44mm image circle covers entire imaging field of full-frame DSLR camera. Using in combination with the Reducer HD5.5, the focal length will be reduced by 0.79x (from F5.5 to F4.3), while maintaining the image circle in dia 44mm, largely improving sharpness over the entire imaging field of the DSLR camera with full-frame sensor.

■ 96% volume of light to the edge of field of view

The flattener HD is specially designed for the FL55SS refractor to reduce a light loss to minimum, successfully secured over the nearly entire image circle of 44mm dia of the full-frame DSLR camera.

■ Extraordinary High Contrast

The same anti-reflective AS coatings, which are used for our high-end VSD100F3,8 Astrograph, are used to take advantage of 99.9% superb high light transmission per lens surface. Loss of light, ghost and flare images are substantially eliminated thanks to the perfect matt black finish in the Reducer HD Kit.

<Vixen FL55SS>

with Prime Focus Photography

With Flattener

With Flattener + Reducer

AS coating, which is used for VSD100F3.8, SD Reducer HD, is adopted for the lens surface.

Loss of light, ghost and flare images are substantially eliminated thanks to the perfect matt black finish in the Reducer HD Kit.

■ Example image with FL55SS+ Reducer HD Kit: Veil Nebula

■ Example image with FL55SS with Reducer HD Kit: North America Nebula

Full-format and APS-C is a common name for size representing the size of the light receiving plane (imaging sensor or film) of DSLR camera. Full-format (36x24mm), APS-C (23x16mm) and Four Thirds (17.3x13mm) are typical available standard for DSLR cameras. In general, the larger the light receiving plane, the larger the range can be shot.