In telescopes and microscopes, what is the alternative name for the ocular lens?
Eyepiece Eyepiece An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is so named because it is usually the lens that is closest to the eye when someone looks through the device. The objective lens or mirror collects light and brings it to focus creating an image. The eyepiece is placed near the focal point of the objective to magnify this image. The amount of magnification depends on the focal length of the eyepiece. An eyepiece consists of several "lens elements" in a housing, with
Lens adapter for other optical systems, including microscopes and telescopes. Most lens adapters feature a male fitting and a female fitting. The male fitting attaches to the camera, and the female fitting attaches to the lens. There is also an opening in the center to allow the light to pass through. Lens adapters can be shorter or longer, based on the respective flange focal distance of the lens and camera being adapted. Flange focal distance is the key specification in determining whether or not a particular type of lens can be adapted to any given camera. Generally speaking, cameras with a shorter