This double telescope option for the AZ4000 mount from 10 Micron allows to use two (or more) optics side by side. It allows you to optimize the load of the mount and take advantage of its altazimuth configuration. The double telescope option is compatible with all of the plates that are used on the GM4000 series, including the dual plates Lodual and Maxidual. If you choose to use these particular plates, you are able to directly use 4 optics (2 per side). This accessory is beautifully manufactured from an aluminized alloy with no flexures and rock-solid sturdiness. You can either order the AZ4000 HPS mount already configured with the double telescope option or buy it afterward as an accessory.