"D" Lenses = Distance (Helps in exposure metering)
"G" Lenses = No aperture ring, cheaper plastic build
"Ai" Lenses = Chrome Ring, 7 Blades More accurate (longer) Focus Throw
"Ai-S" Lenses = Aluminum Ring, 9 Blades, nine blades produces better bokeh, (shorter Focus Throw/less accurate throw)
"DC" Defocus Control. Better bokeh without softening the foreground subject
Zooms - There are two basic types
Two Touch: Zoom Ring and Focus Ring
Push and Pull: Slides in and out like a trombone (more susceptible to dust)
Blades - The center of the lens blades should be circular, not polygonal
Glass- The thinner the better (ie. Gauss or the even better Double Gauss)
Multi-Coating- Reduces lens flare and ghosting/ Increases light transmission
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