This kit consists of a high performance flattener lens and a connecing tube ring. It improves image quality of photography by achieving a flat focal plane and allows you to enjoy a high level of prime focus astrophotography. 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 flattener HD for FL55SS improves off-axis image quality greatly with a minimum change of the focal length. It secures an image circle of 44mm that covers imaging sensors of full frame DSLR cameras.
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 flattener HD kit solves this problem as it works to keep a large 96% illuminated field of view at the very edge of a 44mm image circle. You will feel no hint of light loss if used with a full frame DSLR camera. Astrophotography of nebulae and star clusters are fun with the flattener HD Kit.
96% with use of DSLR cameras with the full frame size of imaging sensors. 99% with use of DSLR cameras with the APS-C size of imaging sensors.
FL55SS with the flattener HD lens
Standard telephoto lens or astrograph
The same anti-reflection AS coatings that are used for our high-end VSD100F3.8 renowned for extremely high light transmission (99.9% per surface) are provided on each of the lens surfaces fo the flattener HD lens. Besides, elaborate matte-finishes are given to eliminate internal reflections and loss of light completely.
Flattener HD Kit for FL55SS
EX Tube 66