This is quite a wide angle view finder for Sony nex5. You see all the screen as it was a huge screen in front of your eye. And with this lens it is super sharp, so you see each pixel of the display. It requires that size lens as seen on the images: it is 27mm/30mm diameter and 4.4 mm thick on the middle. One side is flat the other curvy lens shape.. the weight of my print is 7g and the yellow ring is just cause I changed filament from yellow to black. So rotate the print so it prints the lens part first / downwards..