Provided herein is a monopod or device for supporting a photographic instrument or accessory, such as a camera. The monopod or device comprises extendable members, e.g., an extendable mounting member with a mounting assembly and an extendable middle member with a threadably engagable, rotatable locking mechanism, a base member and an extension mechanism. The locking mechanism is configured to quickly lock the extendable members at an extended length or to collapse the same. The extension mechanism is disposed within the extendable and base members and secured independently to the same. This configuration enables a single smooth release with extending motion of the locking mechanism to telescopically extend or, conversely, collapse the extendable member portions of the monopod device.