Stephen Barrett

Stephen Barrett

Joined on Dec 2, 2011

Articles

Stephen Barrett | Published on Nov 26, 2013 |
Slanted line tests (as opposed to slanted edge tests) were performed on the Canon SX30. The tests were used to produce plots of the Modulation Transfer Function (MTF) as a function of spatial frequency. The measurements are compared with a simple model of the lens and sensor.
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Stephen Barrett | Published on Jun 26, 2013 |
Focus-bracketing for "Macro" setting and for closeup lenses is discussed. In order to adjust the camera's focus distance automatically, the script brack.bas is cited for the macro bracketing and a new script close.bas is provided for closeup-lens bracketing.
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Stephen Barrett | Published on Oct 1, 2012 |
The search for an inexpensive Macro test target is described. Macro resolution is measured and calculated. The search for a test target revealed precautions that need to be taken when printing Macro photographs.
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Stephen Barrett | Published on Aug 27, 2012 |
The resolution of Macro is compared with that of TeleMacro at two different distances. The resolution is calculated and test photos are shown for all three cases.
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Stephen Barrett | Published on Jun 17, 2012 |
Why are the SX30 and SX40 so good at capturing detail at high zoom? I have come to the conclusion that it is because the high pixel density of the small sensor allows it to retain most of the image detail that the lens produces. The APSC sensors of compact SLRs, however, do not.
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