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vignetting
It is noted that quantum-interference transconductance oscillations can occur only if the amplitude and phase of each of the three electron waves on the gate aperture, as well as electron-wave vignetting, are dependent on the gate potential.
      
A discussion is given of the possible techniques for cascade correction in beam-foil lifetime measurements, and of the inclusion of a window function to represent the vignetting effect close to the foil.
      
Details of dye choice, corrections for attenuation due to dye, particles and water, photobleaching, vignetting, CCD calibration, and illumination power and geometry corrections are presented.
      
The results were encouraging, given the degraded quality of the photograph and the fact that features were not centered, as well as the lack of information on lens vignetting characteristics to make corrections.
      
The 13 scanned films have been aligned, coadded, corrected for vignetting effects and cleaned of stellar features.
      
In-Orbit Vignetting Calibrations of XMM-Newton Telescopes
      
We describe measurements of the mirror vignetting in the XMM-Newton Observatory made in-orbit, using observations of SNR G21.5-09 and SNR 3C58 with the EPIC imaging cameras.
      
We show the spatial and energy dependences of measured vignetting, outlining assumptions made in deriving the eventual agreement between simulation and measurement.
      
This is the first study of the X-ray emission from LDE's to include all corrections for scattering and vignetting.
      
Near the edges of the CCD the fits are less accurate due to vignetting.
      
This includes the photometric calibration, vignetting function, geometric distortion, stray light, and exposure and observation times.
      
These pits influence the BRDF via vignetting, cast shadow, interreflection and interposition, causing it to differ markedly from Lambertian.
      
In this paper we show that this approach can significantly extend the optical dynamic range of any given imaging system by exploiting vignetting effects.
      
We derive the optimal vignetting configuration and implement it using an external filter with spatially varying transmittance.
      
We also derive efficient scene sampling conditions as well as ways to self calibrate the vignetting effects.
      
A usual filter turret would lead to severe vignetting inside the telescope.
      
All apertures must match the size of the image of ' and all optics must accommodate the incident numerical aperture to prevent vignetting.
      
Also, there is significant radial intensity falloff and vignetting associated with fisheye lens.
      
Also, assuming the proper lens configuration, there is no vignetting near the corners of the CCD.
      
As we show in Paper II, these geometric considerations allow us to accurately model the observed system vignetting.
      
 

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