Celestron 93326 Omni Barlow Lens, Silver, 2 x 1.25 Inch

Product Information

Where the Barlow lens is placed behind the star diagonal (between the star diagonal and the eyepiece), i.e., placing the star diagonal ahead of the Barlow lens, you’ll achieve the expected focal length or amplified magnification using the Barlow lens. For example, this means a 17mm eyepiece will behave like a 5.6mm eyepiece. As a bonus, the increase in the scope’s focal ratio can improve image sharpness, but only under ideal conditions. When buying Barlow lenses make sure you have the right barrel size, magnification, and the type of Barlow that suits your telescope. Correct barrel size first up

If you have a couple mid or low power eyepieces, the Orion 3x Barlow saves you the cost of investing in high-power eyepieces. Darker images. Any item you add to your optical setup will lose a bit of brightness on the way. Of course, the better the Barlow lens, the less this will be a problem, but it’s impossible not to lose at least a little bit of light on an optical device. What does A 2x Barlow lens do? A 2x Barlow lens doubles the magnification of your eyepieces. It does this by increasing the focal length of the telescope. If you want to get as close as you can to Saturn, other planets and the moon, the 5x Svbony Barlow Lens is a good choice.For instance, if you have a 20mm eyepiece and a 1,000mm telescope, the magnification is 50x. With the Svbony Barlow Lens, the new magnification is 250x. The distance d 1 is a measure of the distance between the Barlow and the original focal plane of the telescope objective. As discussed in the Appendix, d 1 and d 2 are related to each other by: Installing a Barlow lens on a telescope is a simple process. Here’s a step-by-step on how to use a Barlow lens on a telescope with a diagram to follow that will further help. In a refractor telescope, it can also provide 3x magnification when you insert the diagonal into the Barlow.

Barrel size. This can be 1.25″ or 2″. You will need to select the one that fits your telescope. If you don’t know which one you have, your eyepieces probably have it on their label. It is the same. When searching for a Barlow, you must get one with an achromatic or apochromatic lens(2 lens elements or 3 or more lens elements). It should also be fully multi-coated to prevent internal reflections and preserve high contrast. A Barlow is really not an element to cheap out on, since a bad Barlow can make the image worse. If it’s going to double your eyepiece collection anyway, it seems like you can afford to make sure you don’t end up with one that adds aberrations and false color fringing. Instead, let’s scratch that 3x Barlow and let’s consider adding another eyepiece, but since we are planning on getting the 2x Barlow, remember the value of every additional eyepieces we buy doubles as we get access to two new magnification values.If you have a 1,000mm eyepiece, you’ll have at your disposal the following magnifications: 100x and 200x for the 10mm eyepiece; 33.3x and 66.6x for the second eyepiece. As for the not-so-good part, don’t expect a sharp and clear image. Because of the greatly increased magnification, there’s more distortion. The image may appear blurry and a bit dim. Combining the two equations, the magnification factor M B can be written in terms of d 1 : M B = F B / (F B - d 1 ) (Eq. 3) One can imagine that there's a cone of light produced by the objective that comes to focus at the eyepiece. In a fast scope this cone is fat and short. In a slow scope it's long and thin. The focal length of the telescope is the height of the cone, the tip being at the focal plane and the base being at the objective. There are 3 main features to consider that will help you distinguish between quality Barlow lenses and the rest: