Camera Telescope

Drawings telescope

The job of a telescope is to collect light, not (not the eyepiece that job), an image to enlarge. The biggest target (the part that collects the light), if a lens, in refractors, reflectors or mirrors to gather the more light the telescope. The more light you gather more details, will capture you be able, and also important for astrophotography, the shorter the exposure time, you must be in order to capture these details.

Refractors

The type of telescope imagine most people, if it is to hear the word telescope “refractor. This is what Galileo for his break-thru uses discoveries. A telescope has a lens on the front that just the light passes through the back of the tube, focusing this light to an eyepiece or camera for astrophotography.

Advantages:

-No central obstruction (see more in the areas of application reflective), which provides a higher contrast.

With the design-simple, they require little maintenance.

-Excellent for planetary and lunar viewing and photography.

Excellent for wide-field viewing and astrophotography especially in shorter focal lengths (see below).

-Because the target is continuously adjusted and there is no need for collimation (again more on that in another article).

Excellent color in apochromatic and ED (Extra Dispersion) designs.

Disadvantages:

-More expensive per inch of aperture (objective) than reflectors and catadioptric telescopes.

-Can be bulky and difficult to manage, especially in the larger lens designs.

Newton Telescopes

This design was created by Sir Isaac Newton (he of the apple on the head fame) invented. Instead of a lens in front of the tube this telescope design uses a concave parabolic mirror to collect light and reflect in front of the tube to a flat diagonal mirror which reflects light on the side of the bezel, the eyepiece or camera for astrophotography.

Advantages:

Lowest cost per inch of all the drawings of the telescope.

More light-intensity per dollar because of the design at a lower cost.

Absolute perfect color reproduction.

More compact design, a telescope to collect the light ability, compared similarly.

Excellent contrast for planetary and lunar astrophotography and viewing in longer focal lengths.

Can excellent wide-angle astronomical photography and short exposure times shorter focal lengths to get.

Disadvantages:

-Slight loss of contrast through the central obstruction (secondary mirror flat), compared to a telescope.

-Requires more maintenance, such as collimation (discussed in another article), which is essential for good results in your astrophotography, although you will learn how to do this quickly with practice.

Schmidt-Cassegrain Telescopes

It is a very popular design with high-tech look. Well as CAT (Catadrioptics) known. They use a combination of lenses and mirrors to collect and focus the light onto the eyepiece or camera. Light enters the telescope through a thin “lens” is called Schmidt corrector plate, goes to the back of the frame of a spherical primary mirror that reflects light back toward the front. Here the light hits another mirror, the secondary mirror is mounted on the corrector plate. This secondary mirror then reflects the light back to the rear, where it has a hole in the primary mirror where the light concentrates collected by an eyepiece or camera astrophotography.

Advantages:

Compact and portable.

-Low maintenance although once again the panel is required for optimum performance.

-Many accessories Astrophotography numerous.

-Cheaper per inch of aperture compared to a pair of glasses.

Excellent all-round telescope, good to very good for both visual and astrophography.

-Very good for planetary and lunar viewing and astrophotography.

-Very good to excellent for DSO (Deep Space Object) astrophotography with a reservation (see cons).

Very good to excellent optics, both Meade and Celestron are of excellent optics on a consistent basis.

Disadvantages:

-More expensive per inch of aperture compared with Newtonian telescopes.

Loss of contrast through the central obstruction, which is even more important than in the Newtonian perimeter.

Due to their focal lengths over the field of view is smaller and exposures are required for astrophotography, but an objective is known as a focal reducer, which reduces or eliminates this problem. The longer the focal length is actually an advantage in planetary and lunar