a long, slender lens a large, circular front element a focusing ring an aperture ring a hood to protect the lens a tripod mount a zoom ring to adjust the focal length a distance scale on the lens barrel
telephotolens which is a long, slender lens telephotolens which is a large, circular front element telephotolens which is a focusing ring telephotolens which is an aperture ring telephotolens which is a hood to protect the lens telephotolens which is a tripod mount telephotolens which is a zoom ring to adjust the focal length telephotolens which is a distance scale on the lens barrel