"Although WPPD was a bright day here in New Jersey, I had planned this image for a while and it needed to be taken in the dark, so I shot it that night. I had read about a zoom pinhole that was available, so I made one myself. I used a 65mm diameter helicoid focuser that went from 25mm to 50mm in extension as the barrel was rotated. I bought this on eBay for $30. I fitted an adapter ring to get the helicoid to attach to my Sony A6500 mirrorless camera. I used metal duct tape to hold an EF-FE adapter to the inside front of the helicoid. A homemade 0.26mm silver pinhole mounted to the inside of a black plastic Canon body cap was then fitted to the EF adapter. The entire assembly worked as a “zoom” pinhole with an effective "focal length" that ranged between about 65mm to 90mm. The subject of my image consists of a pile of colored Xmas tree lights, the older style lights with filaments, not LEDs. Most LEDs flicker - filament lamps don’t. I handheld the helicoid focusing ring and rotated the camera, all the while wobbling the camera while I aimed it at the colored lights in a darkened room. The image was a 2 second exposure at 800 ISO. The resulting image noise was reduced with Topaz Denoise AI and then edited in PhotoShop using NIK and Topaz software. For the pinhole diameter, I used the figure 6.1A table in Eric Renner's book on Pinhole Photography, 4th Edition. The tapered portion of a #13 beading needle formed the pinhole, sanding with 1000 grit abrasive paper on both sides."