I think that both warnings are exactly what I'd put in a similar product I was selling. And personally, I'd not observe either of them very diligently.Nitpicker wrote:This is from the safety pages of my DSLR's manual:
I think the second warning is a pretty good warning, but the first one may be over the top, even when the sun is high and even if the camera is on a fixed tripod. I wonder if the risk of damage to the camera is greater with the shutter closed, or the mirror down, or even to the perimeter of the sensor? As for damaging the sensor itself, I imagine a wider image might be worse, in terms of concentrating the direct photons from the Sun onto fewer pixels. But I really don't know. I keep thinking about when I was a kid and setting fire to paper with a magnifying glass.
What matters isn't the FOV of the lens, but the lens aperture. You aren't going to set fire to paper with a lens a few millimeters across; one a few hundred millimeters across can melt aluminum. As far as your eye is concerned, magnification is an important factor. A small image of the Sun on your retina doesn't easily cause damage because the heat can be carried away. A large image (with the same surface brightness) can almost instantly cause permanent damage.
One indicator that having the Sun in the FOV of the camera is generally harmless is the fact that even when the Sun's image isn't on the sensor, there's a good chance it's on some internal surface of the camera. And that doesn't cause any problems.