The handling has been described several times - that's why I'm not elaborate. The important thing is patience bring. Take time. Then it will come. We have built for the current eclipse therefore a conversion lens for a 400-Tokina, a "Sofi-intent" for a small pair of binoculars and even a filter insert for an old Novoflex quick-shot lens. The filter element was the biggest challenge, because the various descriptions have lent for nothing and the film is ultimately held with four small screws in position. But it worked. Some test photos before the actual event on 20.03.2015 has shown that there's more possible than pure eclipse photography. At least the parts that I have built for the lenses are therefore unlikely to disappear until the next such event in the closet. Who wants to get a taste without great investment in the issue sun Photography, has no two left hands and the time may take for crafting and wants, making the film a good grip.