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

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I often use a Barlow lens with my dedicated astronomy camera when photographing planets. How does a Barlow lens work?

Magnification on this Barlow lens is 2x, which means twice as much magnification from your telescope + eyepiece setup. Also, in this device are multi-coated lenses.

They can see clearer images of Saturn and other planets as well as the moon. They also got to save quite a bit of money on buying extra high-power eyepieces. Should You Buy It? Top of the list of benefits is the 2x magnification that will add to your telescope’s capabilities. Making this possible are the two achromatic lens elements in the design of the Barlow. If one is inserted into the light path of any type of scope, the effective focal length of the scope is increased. To clarify—when using a DSLR or Astro-camera for astrophotography, the telescope itself is being used as the “lens” of the camera. When imaging with cameras with permanently attached lenses, such as a point-and-shoot camera or a smartphone, you’ll have to use eyepieces as you would when using a telescope visually.) This is a bit simplistic, because optics is a little more complicated than that (think of a 127 Mak, where the effective focal length can be 1500mm without the light travelling anywhere near that far even if it is "folded over" on itself), but I think it conveys the general idea in a not-too-inaccurate fashion.

It’s also important to remember that Barlows aren’t magic. You still have a maximum useful magnification defined by your aperture and the optical quality of the system. So don’t just get a 5x Barlow because it reaches the highest power. Increased magnification. This is their primary use. Increasing the magnification you get through your lens. Of course, you want better visibility of the astronomical objects when you set out to get a Barlow lens. Your efforts can be impeded by the optics if you’re not careful. Good optics will collect enough light to allow you to see the image as it is.

Best Barlow Lens Reviews

As a fourth example, let’s replace the eyepiece with a ZWO ASI224MC camera that inserts directly into the same Barlow (with no diagonal). The ASI224MC has a sensor recessed 12.5mm from the edge of the camera body that sits directly on the top of the Barlow when it’s inserted. That means d 2 =75mm+12.5mm=87.5mm, and M B =2.17x, a little above the nominal value. Most high-power eyepieces suffer from short eye relief, which can affect viewing comfort especially if you wear glasses. The barrel holds standard 1.25″ eyepieces and out of all the ones we have (a lot) we couldn’t find one that didn’t fit it. Not compatible with #93648 Off-Axis Guider, not compatible with #93519 2" Mirror Diagonal (discontinued) What we liked: We liked the 26mm clear aperture. This works together with the multi-coated lenses designed for eliminating most of the chromatic and spherical aberrations to ensure the images are worth your money.

Carefully insert the Barlow lens into the telescope’s focuser, ensuring that it is securely in place.

Barlow Lens Buying Guide

Great magnification isn’t always better: a Barlow lens will increase the magnification of your object, but also any turbulence that may be present. This may result in blurrier views while observing. Because the cost of a Barlow lens will usually be on par with that of an eyepiece, you would be saving a lot of money and storage space. I know that focal length divided by aperture equals focal ratio. My point is that the 2x Barlow doubles the magnification provided by a particular eyepiece in a particular telescope.

Your right. Thats how we understand it. A Barlow can turn one lens into two, ie doubles the magnification. The above five examples show the magnification of a Barlow increases with increasing separation between Barlow and eyepiece or camera. But is it possible to reduce the magnification factor of a Barlow? It is, in principle, by decreasing the separation of the two elements. In most cases, however, the Barlow’s tube gets in the way.A Barlow lens, named after mathematician Peter Barlow, is an optical instrument used to increase the magnification of your eyepiece for visual astronomy, or extend the focal length of your telescope for astrophotography. Most customers agree that the Svbony Barlow Lens 5x magnification does come with several trade-offs. But many say these limitations are worth the increased magnification. Using a Barlow lens effectively doubles the number of eyepieces that you have in your collection. Barlow vs Powermate: what's the difference?