How do I know if I need the Explore Scientific 1" Focuser Extension Tube?
You need this extension tube if you find yourself running out of outward focus travel with a specific eyepiece or camera. If you have racked your focuser all the way out and the image is still not sharp, this 1-inch tube will provide the additional distance required to achieve focus.
Will this Explore Scientific extension tube fit focusers other than the 2-inch Rack and Pinion model?
No, this extension tube is specifically threaded to match the Explore Scientific 2-inch Rack and Pinion focusers supplied with their ED APO series telescopes. It is not a generic extension and is unlikely to be compatible with focusers from other manufacturers.
Does adding the Explore Scientific 1" Extension Tube affect image quality?
No, the tube itself is purely mechanical and has no optical elements. It simply moves your eyepiece or camera to the correct focal point. Because it is a rigid, threaded extension, it helps maintain the mechanical alignment of your imaging train, which is critical for good image quality.
Can I use this 1" extension tube for imaging with my Explore Scientific ED APO telescope?
Absolutely. Astrophotography is a primary use case for this accessory. Many imaging setups that include a field flattener, off-axis guider, or filter wheel require a specific amount of back focus that this tube helps achieve, ensuring your camera sensor is positioned at the telescope's corrected focal plane.
What is the difference between using this 1" extension tube and a Barlow lens to reach focus?
A Barlow lens is an optical device that multiplies the telescope's focal length and magnification, which also happens to move the focal point outward. The Explore Scientific 1" Extension Tube is a purely mechanical spacer; it provides the needed extension without changing the magnification or focal length of your telescope. If you need extension but want to maintain your telescope's native focal length, the extension tube is the correct tool.
I can't reach focus with a new eyepiece on my Explore Scientific ED102; is this 1" extension tube the solution?
It is very likely the solution. If your Explore Scientific ED102 has the stock 2-inch Rack and Pinion focuser and you cannot reach focus by racking all the way out, this 1-inch extension is designed precisely for this situation. It will give you the extra travel needed to bring that eyepiece into sharp focus.
