A recent NASA Astronomy Photo of the Day selection showcases all the visible colors of the Sun. The beautiful image was created by the McMath-Pierce Solar Observatory and shows that while the Sun often appears bright white, it emits light of nearly every color.
Photographer and "mad scientist" Don Komarechka is back for a DPReview TV episode on ultraviolet light. Specifically, he explains how a modified camera-and-filter combination can reveal hidden ultraviolet patterns that are invisible to the human eye, but crucial for pollinators like bees.
We’re going to ask a controversial question: What do UV filters do, exactly? A UV blocking filter, (not to be confused with a UV Bandpass filter, which has the opposite function) is perhaps the most standard lens filter out there. It’s sold with every beginner lens filter kit along with polarizers and ND filters, and sometimes it’ll even ship with your camera.
If you paid attention in high-school physics, you know that white light contains within it the rainbow of colors of the visible light spectrum: red, orange, yellow, green, blue and violet (and if you're Isaac Newton you throw Indigo in there for good measure).
When the leaves on trees are just starting to change color in the Autumn, try collecting them and arranging …