What is the difference between a doublet and a triplet refractor?

Triplets do not only have better color correction, but also have better correction for spherical aberration. So even if you use a filter, even a narrow-band filter, you will find that triplets give you sharper stars than doublets, provided that they have similar aperture, F-ratio, and glass material.

What is a 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 triplet APO?

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 a double refractor telescope?

But for terrestrial purposes, this is manifestly a great defect, and therefore those constructed for such purposes, as ship, or spyglasses, have two additional lenses, by means of which, the images are made to appear in the same position as the objects. These are called double telescopes.” –

What is the difference between doublet and triplet opals?

Doublets consist of two layers adhered together with glue: The thickness of the opal in a doublet can vary, however it is generally thicker than the opal found in a triplet. The edges of the slice of opal are generally rounded off (if there is enough opal) to give the stone a cabochon (domed top).

Can a doublet be apochromatic?

A doublet cannot be an APO. An APO has three lens elements that bring all three primary wavelengths (Red, Green, and Blue) to focus at the same point. A well corrected doublet with high quality glass is called a ED doublet.

What causes a doublet of triplets?

If the two smallest coupling constants are the same, a doublet of doublet of triplets (ddt) occurs. If the two largest coupling constants are the same a triplet of doublet of doublets (tdd) occurs. If the two largest coupling constants are the same and the two smallest are the same a triplet of triplets (tt) occurs.

Where are Stellarvue telescopes made?

Auburn, California
Stellarvue has been producing refractor telescopes since 1998. Our new SVX telescopes are made with optics we hand-figure at our shop here in Auburn, California. These are the finest and most accurate telescopes we have ever offered.

What is the refractor for astrophotography?

If you’re getting started in deep-sky astrophotography, I believe that a compact apochromatic (APO) refractor telescope is the best possible choice. A compact APO refractor is portable and lightweight, making it a smoother transition from the camera lenses you may be used to.

Should I buy a reflector or refractor telescope?

If you are interested in astrophotography, purchasing a refractor is a better option because of it’s specialized optic design that captures deep space objects like galaxies and nebulae. If you are interested in brighter celestial objects like the Moon or planets or a beginner, a reflector telescope is ideal.

Why are reflectors better than refractors?

Reflectors collect more light than refractors. Reflectors are better for viewing deep sky objects such as galaxies. While refractors may give clearer views, reflectors are considered more user-friendly. They are also better on the wallet.

What are 3 different types of opals?

There are many different types of natural opals. There is black opal, white opal, crystal opal and jelly opal. There are other kinds – fire opal, hyalite, water opal, hydrophane and honey opal. Black Opal is the most valued of Opals and comes mainly from Lightning Ridge.

What is a doublet refracting telescope?

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. These are generally the type of t…

Are triplet scopes worth the money?

A good triplet scope will always be more expensive than a similar quality doublet. Great visual performance comes cheaper in a doublet and good photographic color correction tends to be more affordable in a triplet. Cameras like fast optics that are easier to correct for color and tend to prefer triplets

What is the difference between a triplet and a doublet?

Jumps of 35mm in aperture. Benefit of doublets is the weight is lighter than a same sized triplet and they will cool down faster than the triplet. If a lens goes out of collimation you can typically re-align them yourself but triplets will need to be sent back for alignment.

What type of refractor do I need for astrophotography?

The quick answer is a high-quality, doublet or triplet refractor. Larger models can be very expensive (and heavy!) due to the high-quality ED glass used. I think you will be quite surprised at the performance of a small 65-80mm refractor such as the Explore Scientific ED80 I currently use for astrophotography.