musab
02-09-2011, 12:04 PM
SHE POSTED THIS ON CLOUDY NIGHTS
August 29, 2011 at 16:00 local time (14:00 Greenvich), the apochromatic H-bomb has finally exploded!
An 8" F/6.5 apochromatic doubled objective, made of the very simplest glasses - F1 - K8 (F2 - BK7 Schott), has been successfully tested in the laboratory at the optical bench with 220mm F=2500 mirror collimator.
No visible false colors on a thin string of a bright lamp when looking through a 50x microscope instead of an eyepiece.
The doubled objective has a Diffraction Optical Element (DOE) at it's rear surface - a so called Freshnel lens.
Such a combo - two lenses + DOE, allows to nullify a chromatic aberration - inherent to achromatic objectives. Sphero-chromatic aberration is also nullified in such a system.
We expect a complete telescope tested under a real sky within 5-7 weeks.
Valery Deryuzhin.
http://www.cloudynights.com/ubbthreads/attachments/4779191-IMG_8861.JPG
August 29, 2011 at 16:00 local time (14:00 Greenvich), the apochromatic H-bomb has finally exploded!
An 8" F/6.5 apochromatic doubled objective, made of the very simplest glasses - F1 - K8 (F2 - BK7 Schott), has been successfully tested in the laboratory at the optical bench with 220mm F=2500 mirror collimator.
No visible false colors on a thin string of a bright lamp when looking through a 50x microscope instead of an eyepiece.
The doubled objective has a Diffraction Optical Element (DOE) at it's rear surface - a so called Freshnel lens.
Such a combo - two lenses + DOE, allows to nullify a chromatic aberration - inherent to achromatic objectives. Sphero-chromatic aberration is also nullified in such a system.
We expect a complete telescope tested under a real sky within 5-7 weeks.
Valery Deryuzhin.
http://www.cloudynights.com/ubbthreads/attachments/4779191-IMG_8861.JPG