Light stimuli were provided by a 150-W quartz halogen lamp and monochromator (CM110, Spectral Products), with stimulus flash irradiance and 75-ms flash duration controlled by a neutral-density filter
wheel and electromagnetic shutter (VS25, Uniblitz).
A neutral-density filter
gives me more creative control in bright light, and a clear UV filter lives on my camera to protect the expensive lens from salt water, sand and snow.
The neutral-density filter
rings are attached directly to the objective for easy exchange when brightness adjustment is necessary.
4] plate, a 10% neutral-density filter
was placed in the beam incident on the sample for measurements made at -15/15.
Increase the lighting to reduce the sensitivity needed in the camera and add a fixed neutral-density filter
If you find your CCD camera overexposes the Sun even while using your fastest shutter speed, a neutral-density filter
put in front of the camera will reduce incoming light to acceptable levels.
To prevent "Moon blindness" upon looking away from the eyepiece, use a neutral-density filter
, or Moon filter.
Instead, we formed the image with a 6-mm achromatic lens of 200-mm focal length and reduced its brightness with a neutral-density filter
DayStar filters will supply the telescope optical tube assemblies and neutral-density filters
for capturing partial phases.
The neutral-density filters
were selected to approximately equalize the signal strength produced by the camera at each filter-wheel position when viewing a Kodak[R] n eutral gray reference card.
Both these attributes permit high-light-level, bright-field imaging without the addition of mechanical shutters or neutral-density filters
are handy for extending shutter speeds to several seconds or longer if you wish to record the incoming sea as a misty froth.