![Vivitar Series 1 Auto Wide Angle 28mm](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-eNWQdBTh35KAH83bPaXydwQbwsCV2OgpRMZHEtF4MmyfhhdvJUx2ilAbVfC6u9XysmEMDSNvtMRU5JzCnRMDH5eCv2r7xPuM-Wkwhy9gLYPsicPCVO5SX9qoXE8VWWx54C4W/s400/logo.jpg)
Of the ten documented K-mount Vivitar 28mm lenses (yes, the full list will be posted here eventually!) there are only two which open up all the way to f/2. That's a stop faster than f/2.8, which can certainly make a difference in low light situations. But only if the performance is up to snuff. I've done a series of test shots to see if the K01 cuts the mustard. Read on for the third in the continuing series Looking For The Perfect Normal.