These Masuyama Barlows are designed and manufactured by Ohi Kohki Co., Ltd. in Japan. Manufactured using premium fully multicoated optical glass and available in 1.5x or 2x Configurations. The smooth-sided nosepiece is threaded to accept 1.25" astronomy filters.
The Omegon 2X short Barlow Lens offers an ultra-short design and apochromatic correction. You can combine the Barlow lens with an eyepiece or a camera. ...
The Sky-Watcher NOMAD-5 5x Tele-Centric Focal Extender is a high-quality optical accessory with a variety of uses and connecting options for visual and imaging use.