Image of a nebula taken using a NASA telescope - Original from NASA. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/441232/free-photo-image-galaxy-nasa-starFree Image from public domain licenseSigma zoom 28-300mm f/3.5-6.3 dg macro, location unknown, April 23, 2015. https://www.rawpixel.com/image/6112920/photo-image-public-domain-technology-glassFree Image from public domain licenseSigma zoom 28-300mm f/3.5-6.3 dg macro, location unknown, Jan. 25, 2016. https://www.rawpixel.com/image/6112862/photo-image-public-domain-technology-glassFree Image from public domain license