How To Test A Camera Lens Then turn off auto-focus and dial in the smallest aperture possible remember higher number smaller aperture. A MTF test chart primarily consisting of quadrants located in the center and at the borders. Vignetting check uneven illumination dark corners Lens Testing. Set your camera to the lens minimum aperture look through the lens and press the depth of field preview button.
Do the aperture blades move smoothly. Resolution chromatic aberration and distortion check. Open the aperture to ensure you get a good look.
Examine the lens by peering through it from the lens mount side and look at a bright surface such as an opaque light shade not the sun.
The more you tell us the more we can help. How To Test A Camera Lens Were using a variety of test charts sizes depending on the specific lens. Get the Star chart here. Do the aperture blades move smoothly.
Examining the LensBut before we start optical testing we need to do some basic hands-on touchy-feely. Place an object like a vase flower toy etc at the minimum focusing distance MFD of the lens. A grid chart for the distortion tests. Set your camera to the lens minimum aperture look through the lens and press the depth of field preview button. Here is a summary of what I would recommend in terms of camera setup.
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Place your camera and lens setup on a sturdy tripod. A MTF test chart primarily consisting of quadrants located in the center and at the borders. Were using a variety of test charts sizes depending on the specific lens. The Lens Focus Test To use the lens testing chart you set it up at 45 degrees to the axis of the lens as shown belowThe easiest way to do this is to have the camera horizontal and tilt the target back by 45 degrees. Then turn off auto-focus and dial in the smallest aperture possible remember higher number smaller aperture.
Place your camera and lens setup on a sturdy tripod. You should avoid backlighting the card as this may affect the cameras ability to focus. Resolution chromatic aberration and distortion check. Does it seem to be working. Then we shot some test subjects.
