Apertura 2X Barlow Lens with T2 Threads - 1.25"
Apertura 2X Barlow Lens with Integrated T2 Thread
This is one versatile 1.25" Barlow! Using the Apertura T2 2X Barlow Lens in the standard fashion allows you to double the magnification of any 1.25" eyepiece. Just insert the 2X Barlow into any focuser or diagonal that accepts a 1.25" barrel, and then insert a 1.25" eyepiece into the Barlow and lock it into place with the thumbscrew. Easy!
What makes this 2X Barlow Lens different from most other 2X Barlow's, however, is the integrated T2 threads cut into the top of the Barlow. These M42 x 0.75 threads allow you to attach a standard DSLR or SLR camera specific t-ring to the Barlow for use in astrophotography. This method will increase magnification by 2.5X.
Another astrophotography method is to attach the Apertura T2 Barlow lens element (remove from chrome barrel) to a 1.25" camera nosepiece to achieve a magnification factor of between 1.5X and 2X with your camera. Keep in mind that while this 2X Barlow Lens will connect to any camera that has M42 T2 threads, the magnification factor will vary, as it depends on the distance to the camera's sensor from the Barlow's lens element.
The Apertura 2X 1.25" Barlow with T2 Threads has multi-coated optics, and the edges of the lens elements have been blackened to reduce contrast and increase sharpness.