Brief introduction of direct focus photography

Direct focus photography, also known as direct focus photography and direct focus photography, is a method of shooting directly with a telescope without adding any optical objects between the telescope and the camera. Although there is no optical object, if a defocused lens or defocused lens is used, it can still be regarded as direct focus photography. So actually shooting with a camera lens is also a kind of direct-focus photography, but we just use a telescope as a lens directly. The so-called direct-focus photography means that in the case of tracking photography, "no one will put the camera on the telescope and use it to shoot fixed photography", so the direct-focus photography mentioned below is all tracking photography using the equatorial telescope.