aperture diaphragm

ap·er·ture di·a·phragm

a metal device that limits the area of the beam emerging from an x-ray tube.
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References in periodicals archive ?
One important point to remember when using an external aperture mask is to make sure the camera's internal aperture diaphragm is open all the way; otherwise, the blades will still introduce diffraction spikes in the optical path even when you've put on the circular mask.
Aperture for Camera
The study yields the following results: the radiologic technologists in Cagayan de Oro City and Bukidnon highly practiced radiation protection particularly the use of the aperture diaphragm and avoidance of repeat examination.
Radiation Protection Practices and Biological Effects Experienced by Radiologic Technologists
The substage condenser must have a continuously variable circular aperture diaphragm (A stop) and be capable of true Kohler illumination for the full spectral range of 350 to 950 nm.
Provide and Deliver a Micro-spectrophotometer
It also has minimum focal distance at 5 centimeters and the latest 9-blade aperture diaphragm that achieves a soft background blur effect.
Canon unveils flagship PowerShot G1 X Mark II and four new additions to its PowerShot and IXUS lines that make documenting moments and travel a breeze
There's also an 11-blade aperture diaphragm, which provides soft background blur when a subject is isolated from its background.
Canon releases EF Cinema lenses
Distortion is small in lenses with constructions symmetrically configured on both sides of the aperture diaphragm, but is likely to occur in lenses having asymmetrical configurations.
Understanding and choosing optics Part II: how to weed out or accept the undesirable traits
Advanced microscopy systems automatically store the field and aperture diaphragm and the light intensity settings for each combination of magnification and contrasting methods.
For modern microscopy, "intelligence" makes the difference
Remove the eyepiece and close the aperture diaphragm by 1/3
Microscopy of hair part 1: a practical guide and manual for human hairs
The aperture diaphragm on the microscope can be used to control NA also, fine-tuning the balance between resolving power and depth of field.
Using Optical Microscopy to Analyze Materials
The lens features a nine-blade curved aperture diaphragm to provide beautiful, blurred backgrounds even at full-zoom range.
United States : Three New High-End, Advanced PowerShot Models from Canon U.S.A. Empower Photographers to Create Amazing Images and Video
Seven-blade aperture diaphragm that helps to create smooth and round bokeh effects.
Japan : Fujifilm launches the FUJINON XF10-24mmF4 R OIS an ultra wide to standard zoom lens with an F4.0 aperture throughout

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