Factors of Lens Quality:

• Sharpness - (Most modern lenses are sharp at F8 under balanced lighting conditions. Sharpness at F1.4 or F2.0 will make the difference.)

• Contrast -

• Flare -

• Bokeh - back ground

• Auto Focus Lock On -

• Construction Sealing -

• Construction Materials -

• Suitability to task - a zoom will typically beat a prime unless the prime is very fast and has an optical personality.