Projector Lens (Adjustable Focus)

This is the casing for a 75mm diameter magnifying glass with a focal distance of 210mm. First screw the inner cylinder into the back of the outer cylinder. Then, screw the inner cylinder all the way through until it stops. Now you can insert the magnifying class into the inner cylinder. Finally, screw on the cap and you're done! I hope you enjoy this device! Let me know if you have any questions or suggestions about the model.