What is an ED Refractor?
ED Doublets The most cost effective solution is the Extra low dispresion glass doublet or (ED) refractor using one special dispersion element to focus virtually all wavelengths extremely closely, resulting in a near perfect in focus star image.
What is ED refractor telescope?
Apochromatic (APO) lenses are designed to bring three wavelengths of light (red, green, and blue) into focus in the same plane. The classic achromatic doublet made from optical crown and flint glasses bring two colors of light to a common focus. …
What is FPL53?
FPL53 is a higher quality glass that is more expensive. But, the design of the lens is very important. It is quite well known around here that the Astro-Tech 111 (no longer made) is a wonderful telescope. It is a triplet using FPL51 designed by Thomas Back. But there are doublets that use a FPL53 that are very nice.
What is an ED doublet refractor?
Doublet Refracting Telescopes, or Doublets, as they are commonly referred to, are simply just refractors that use 2 lenses to get a cleaner and more precise view. These telescopes can also be classified as apochromatic or achromatic depending on the scope itself.
What is an ED doublet?
This chromatic aberration can be corrected to a degree with a pairing of lenses, made of two different types of glass. This pairing is called a doublet. This is where ED glass steps in. It is specially designed glass that further reduces chromatic aberration.
Why are Takahashi telescopes so expensive?
There instruments are triplets with APO coatings, and 5in objectives and other lenses are OVER THE TOP expensive. The coatings and hardware that go into such instruments are also expensive.
Who makes Astrotech?
Astrotech Corporation
| Traded as | Nasdaq: ASTC |
|---|---|
| Headquarters | Austin, TX , United States |
| Number of locations | 3 |
| Key people | Thomas Pickens, CEO |
| Services | Technology Incubator |
Who makes Skywatcher telescopes?
Synta Technology Corporation of Taiwan
Sky-Watcher is a commercial distribution company established in 1999 by the Synta Technology Corporation of Taiwan (Synta Taiwan) that markets telescopes and astronomical equipment, like mounts and eyepieces, aimed at the amateur astronomical market.
Are APO lenses better?
An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses.