This is a copy of one of my favorite childhood toys, the classic 'Slinky', which I wrapped around a clear/bare bulb.  

This shot showcases the way that the Visual Quality can handle specular highlights/glare/reflections off of mirrored or metal surfaces in a way that the semi-Achromatics simply can't.    Consider the glare pattern along the front of the 'Slinky', the Visual Quality handles this fairly, w/the Semi-Achromatics this area would've had absolutely GARISH and blown out halos that looked like someone had set off flares in the shot.

Along w/being difficult to focus, this is the 'Achilles Heel' of the earlier Pinkhams and the primary reason they're 'hard to handle', their inability to handle intense illumination.   It's very difficult w/the earlier Pinkhams to eliminate the glow, or get a glow, and make that glow 'pleasurable' or something that looks like it was important to the rationale of the shot w/bright, direct, frontal Illumination.   W/my wrestling around w/the earlier Semi-Achromatics, I was 'up against it' when trying to shoot wideopen with illumination brighter than the light coming from a 60 watt lightbulb in many scenarios.

Figuring out workarounds like carefully considered backlighting/indirect lighting/underexposure at wideopen w/prolonged shutter times to compensate(What I began to figure out w/the earlier Pinkhams was to underexpose at wideopen or NOT COMPENSATE for bellows factors on close-in shots as a way of knocking down the light) is what makes the learning curve so pronounced for the earlier Pinkhams, and I remember on week where I shot exclusively w/my P&S Ser III where I was totally exhausted afterwards, mentally and physically, along w/a three day splitting headache.

Things are not so bad w/the Semi-Achromatics once you began to know them, but the Visual Quality is more forgiving focuswise and in its ability to handle bright light.

Take care