VIXEN Reducer HD Kit for FL55SS Telescope Accessory
This kit consists of a high performance flattener lens, a high performance focal reducer and a connecing tube ring. It improves image quality of photography by achieving a flat focal plane and reduces the focal length of the FL55SS by 0.79 times. The flattener lens corrects aberration on the periphery of a photographic field of view and it keeps images of stars sharp throughout the photographic field. The focal reducer achieves faster photographic speed of F4.3 by reducing the scope's focal length.
Sharp star images throughout a photographic field of full frame DSLR cameras.
The flattener HD lens improves off-axis image quality greatly with a minimum change of the focal length. The focal reducer HD5.5 reduces the focal ratio of the FL55SS scope from F5.5 to F4.3 (by 0.79 times) while keeping a 44mm image circle that covers imaging sensors of full frame DSLR cameras.
A minimum loss of light toward the edge of photographic field. A 86% of illuminated field of view is sufficient for the full-size imaging sensors.
Generally astrophotographers are annoyed with the drop-off of light toward the edge of illuminated field of view when taking faint deep-sky objects with a telephoto lense or dedicated astrophoto instrument. Although this may be corrected by complicated image processing on a PC, it all depends on the image quality of an original photograph. The focal reducer HD5.5 works to keep a large 86% illuminated field of view even at the very edge of a 44mm image circle in combined with the flattener HD lens. Astrophotography of nebulae and star clusters are fun with the focal reducer HD Kit.
Illuminated field of view at the edge of the photographic field.
86% with use of DSLR cameras with the full frame size of imaging sensors. 97% with use of DSLR cameras with the APS-C size of imaging sensors.
Flattener HD for FL55SS
| Applicable to | FL55SS optical tube asembly |
| Effective focal length | 500mm to 312mm |
| Magnification | 1.04x |
| Focal ratio | F5.5 to F5.7 |
| Image circle | 44mm in diameter |
| Illuminated field of view | 96% |
| Optical construction | 2 elements in 1 group |
| Optical coatings | AS coatings (More than 99.9% light transmission per lens surface) |
| Dimensions | 58mm dia x 30mm long |
| Weight | 107 g |
Flattener HD for FL55SS plus focal reducer HD5.5
| Applicable to | FL55SS optical tube asembly |
| Effective focal length | 300mm to 237mm |
| Magnification | 0.79x |
| Image circle | 44mm in diameter |
| Illuminated field of view | 86% |
| Optical construction | 2 elements in 1 group + 3 elements in 3 groups |
| Optical coatings | AS coatings (More than 99.9% light transmission per lens surface) |
Focal reducer HD5.5
| Applicable to | FL55SS optical tube asembly |
| Magnification | 0.76x |
| Optical construction | 3 elements in 3 groups |
| Dimensions | 68mm dia. 45.3mm long |
| Weight | 237 g |
| Optical coatings | AS coatings (More than 99.9% light transmission per lens surface) |
Brand: Vixen |
Code: VX37253
APN: 4955295372539 |
Supplier Code: 37253
Supplier Description: Reducer HD Kit for FL55SS
Brand: Vixen |
Code: VX37253
APN: 4955295372539 |
Supplier Code: 37253
Supplier Description: Reducer HD Kit for FL55SS
At a glance
This kit consists of a high performance flattener lens, a high performance focal reducer and a connecing tube ring. It improves image quality of photography by achieving a flat focal plane and reduces the focal length of the FL55SS by 0.79 times. The flattener lens corrects aberration on the periphery of a photographic field of view and it keeps images of stars sharp throughout the photographic field. The focal reducer achieves faster photographic speed of F4.3 by reducing the scope's focal length.
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