Homeliness, Tools and equipment
Barlow lens: product specification
The Barlow Lens is one of the most popular accessories in the arsenal of astronomers, both professionals and amateurs. It is important in this field of activity. This device is in the form of a concave simple lens (negative), which greatly increases the effective magnification of the telescope. This element was invented in the XIX century by the mathematician Peter Barlow. Hence the very name of this device.
Product Application
Due to its multifunctionality, the Barlow lens is quite widely used by astronomers of various qualifications. With the help of this device it is possible to realize the maximum possible increase in the object that is observed in the telescope.
Dignity
The main advantage of this device is that it increases the amount of available magnification. For example, if an astronomer has eyepieces 10 mm, 18 mm, 26 mm, then if there is a Barlow 2x lens, his tools are enlarged by these devices to 5 mm, 9 mm and 13 mm. This is economical in this case. In other words, one Barlow lens can replace three eyepieces.
Diversity
The most common Barlow lenses are two-fold (2x). However, the increase multiplier for these products produced today is very diverse. The Barlow lens 3x, and 4x, and 5x is quite common, and you can also find 1.5x and 2.5x. There are models with variable magnification from 2х to 3х. To complicate the use of these lenses may not sufficiently high focus of the telescope.
Tip
When selecting the necessary Barlow lens for an existing telescope, special attention should be paid to the diameter of the landing sleeve. Its size can be 0.965, 1.25 or 2 inches. It should be identical to the diameter of the focuser and the eyepiece seating. In order to get a double image magnification with the Barlow 2x lens, it is necessary to place it between the diagonal mirror and the eyepiece. These products of really high quality should have an enlightenment and ideally it should be multi-layered.
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