I have many vintage cameras in my collection that I enjoy using, but the old uncoated lenses are prone to flaring when unwanted light hits them. Of course, the easiest way to avoid this is to use a lens shade, but these are unavailable or expensive for many of the old cameras. One of my favorite oldies is a 1955 Voigtlander Vito III. I am now making my own custom lens shades for these cameras; they have two important advantages over standard metal lens hoods: they hold a filter, and they help protect the lens from minor impacts.I make them individually by hand, casting a rather messy liquid rubber into my own silicone rubber molds. They’re not cosmetically perfect; they usually have very small bubbles, pits and roughness.  That’s because my small home workshop just isn’t capable of technological perfection. But they do function as claimed. In the pictures, one of the shades is shown mounted on my camera with its 50mm f/2 Ultron lens. The outer ring of that lens measures about 32mm, and my shade pushes adequately onto the front, smooth ring and fits snugly onto the knurled second part of the ring. They also fit other lenses of that size, including the 80mm Color-Skopar on my Voigtlander Perkeo II, the 50mm Xenon on my 1942 Super Baldina as well as the 50mm Xenon on my 1942 Adox (Wirgin) Adrette.Many standard filters will fit because there are no threads to match; the filters just drop in and the rubber retaining ring secures them. The filter retaining area is almost exactly 41mm in diameter. The smallest diameter filter that will fit without falling through is 32mm. So far, I have personally tested the following: Hoya and Tiffen 39mm (40.5mm outside diameter) - They push in easily and fit perfectly. Vivitar 40.5mm (tight) Aragon 40.5mm (tight) Argus 41mm drop-in (tight) Walz 40.5mm (tight) Filters for Meopta Flexaret cameras from about 1950 onward. Mamiya 40.5mm will NOT fitFotodiox 39mm will NOT fitI believe old Series 5.5 filters will also fit. According to Wikipedia, they have a diameter of 35.9mm. I also have an ancient Zeiss Ikon filter marked “IV” on the rim and “42mm” on the plastic case that fits perfectly. There are probably many others, including most 37mm filters (although they are quite loose inside the shade). It all depends on the actual outer measurement of the filter ring, not what the manufacturer indicates as the thread size.I would seriously recommend only using filters with an outer measurement of no more than 40.5mm.By the way, if you should ever need a replacement retaining ring, it’s simply a black rubber O-ring, available at any hardware store — 1-3/8” ID x 1-5/8” OD. It’s also known as a number 220, a standard item in the O-ring industry. Really.Note: When applying the shade to the lens, hold onto the shutter as shown in the last picture above, to prevent the lens from trying to retract.This sale is for one lens shade/filter holder and one retaining ring. Camera and filter are not included.Note to buyers outside the USA: I ship free to eBay's international shipping service in Illinois. After leaving there, they will be subject to an additional international shipping charge. And in most cases the destination country will add an import (customs) charge. These vary from country to country. For instance, my film trimming templates sent to Japan and China have no import charges, but when sent to Great Britain, Germany and France the shipping and import charges are almost as much as the item itself. I apologize in advance for this, but it is entirely beyond my control.