The Hestia is a small, portable device that uses your cellphone ... I put on a hat with a big brim which shielded my eyes. But once I found the Sun, it was easy to use the focus and choose the ...

The Hestia is a small, portable device that uses ... I put on a hat with a big brim which shielded my eyes. But once I found the Sun, it was easy to use the focus and choose the exposure time ...