Comparing sharpness of 16-80 to other lenses

Started 9 months ago | Discussions thread
Steve Bingham
Steve Bingham Forum Pro • Posts: 27,201
Re: Questions

For a complete understanding of these two terms, look up MFT. They are a measure of contrast and resolution (together) taken 90 degrees apart (diagonals). There is MUCH more to learn - as you will find out! Some manufacturers use theoretical and wide open. Others use both wide open and f8 (Canon). Still others test actual lenses. Many variables, including distance. Some use 15 lines per mm, others use 10, 15, 30, and 45. The closer the M&S lines are (at a given lines per mm), the sharper the lens is - well sort of.

"Modulation Transfer Function or "MTF" is a measurement of the optical performance potential of a lens. MTF charts can give you a better understanding of the optical quality of various lenses." You CAN NOT compare brands due to the many methods used.

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Steve Bingham

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