How to equip an old lens with a focusing tube

The method of matching the old lens with the focusing tube is as follows.

1. To determine the model and specification of the required focusing cylinder, it is necessary to select the appropriate focusing cylinder according to the aperture and focal length of the old lens. It is generally recommended to choose the same brand or series of focusing cylinders.

2. Remove the front lens group or the rear lens group from the old lens, and connect the focusing cylinder with the lens interface according to the interface of the focusing cylinder. If the old lens doesn't fit the interface of the focusing barrel, you need to buy an adapter ring to connect it.

3. Fix the focusing cylinder on the lens to ensure that it is firm and not loose. Reinstall the front lens group or the rear lens group on the lens, and pay attention to adjusting the clarity and focal length.

4. Focus the lens by adjusting the focusing ring or focusing lens barrel. After adjusting the focal length, you can take pictures with the old lens with the focusing tube.