"DIY" Focus calibration on Vivitar 28mm F2 possible? (S.L.E.)

Patreon ► https://www.patreon.com/user?u=57434418 Do it yourself "DIY" focus calibration on Vivitar Auto Wide Angle 28mm F2 lens possible? In this video, we see if anyone with a digital camera and a test chart can properly adjust the front lens group of the Vivitar 28mm F2 lens. As you may already know, this lens has a odd focus system utilizing a separate helicoid for the front and rear lens groups. Hopefully it's our last video of this lens. FR SLE EP11 Music : Jindupe & Allabout By : Lauren Duski