Perfect, 4-element Meade Telextender 5x Barium lens (5000 series). Unmatched quality of optics, indispensable, among others in astrophotography of the Moon and planets.
The basic benefit of using Barlow's lenses is that they allow you to limit the number of glasses while providing a large span of available magnifications. For example, having 2 glasses with 30 and 15 mm focal lengths, using the Barlow 3x lens we get an additional two magnification corresponding to 10 and 5 mm focal length spectacles. In addition, the Barlow lens does not change the eye- shadow offset of the eyepiece ( eye relief ), allow you to focus farther away from the tube (when you have a problem with sharpening the image) and allow you to lengthen the focal length when shooting the sky at the focus of the lens by multiples the equivalent of the Barlow lens (2x, 2.5x, 3x, 5x).
In addition, Barlow lenses, especially those with a large number of times (2.5 - 5x) are often used for photographing planets - they allow to obtain very long focal lengths and significant angular dimensions of objects when taking pictures in a bonfire without the need to use from projection.
| • Multiplicity: || 5x |
| • Construction: || 4 - element |
| • Diameter of binding: || 1.25 inches |
| • Anti-reflective layers: || FMC |
| • Weight: || 199 g |
HOW TO FIX THE LIGHT TELESCOPIC LENS