aperture diaphragm

ap·er·ture di·a·phragm

a metal device that limits the area of the beam emerging from an x-ray tube.

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 aperture diaphragm in the condenser is used to control resolution or contrast.

Distinguishing particles by refractive index: the index of refraction of a material is defined by the speed of light in vacuum, C, divided by the speed of light through the material, V

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

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

The adjustment of the camera was standardized in manual mode, specifically, the settings for the aperture diaphragm (1/16), the exposure time (1/80") and the sensitivity (ASA/ ISO 100) were determined.

CIE [L.sup.*][a.sup.*][b.sup.*]: comparison of digital images obtained photographically by manual and automatic modes

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.