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It's very stopped down, with an 800-millimeter lens — sometimes 600, but mostly 800-millimeter.
Place a flat, high contrast specimen onto the stage in Kohler transmitted illumination with the condenser aperture stopped down.
Both images were taken with a 16ms exposure time and the corrected lens is stopped down to F/4.
Parents stopped down the street to spare children the embarrassment of being seen with Mom.
You have very little depth of field, so you want it to be stopped down as much as possible.
A stopped down aperture can be used to avoid defocus blur, a shorter exposure can be used to avoid motion blur, and a pin-hole mask can be placed near the sensor to directly measure the light field.
Similar(43)
Halfing the aperture is equivalent to stopping down 2 stops.
Stopping down an aperture (not stopping down a telescope) means putting a diaphragm across the telescope aperture.
|| || || To stop down the telephoto lens by four stops, I divided the aperture radius by 4.
Stopping down the lens decreases the number of rays that reach the film.
The left image is the image that resulted from stopping down the telephoto lens by four stops.
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