The metal bodied Flash Six-20 was an outlier in Kodak's post-war plastic Brownie lineup. Perhaps the choice of materials was related to the sudden availability of steel for consumer products. I loaded mine with a roll of well-expired Ilford Pan F 50 for a neighborhood stroll. As I walked out the door I was thinking about the fact that I had not tried the camera's built-in close-up lens, so I snapped a shot of our deck furniture as a test, which the Six-20 passed comfortably. The next two shots gave me some dull, blurred results. I'm not sure if I misjudged the distance, or just didn't hold the camera steady enough to accommodate the slow shutter speed.
I switched back to the camera's "Beyond 10 Feet" setting and got a nicely sharp rendering of some winter- bare trees. However, the left fifth of the image was black -- don't know why.
I stuck with the non-close setting for the rest of the roll and the following full-frame images nicely illustrate the central sharpness of the meniscus lens along with some corner vignetting and blurred periphery.
I got to the Plaza Vieja in Old Town with just one frame left, which was good luck as Elvis was making a rare appearance there for a small group of devoted fans.