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07.12.2011., srijeda

GRADUATED ND FILTER 58MM : GRADUATED ND


GRADUATED ND FILTER 58MM : FIR FILTER VHDL CODE.



Graduated Nd Filter 58mm





graduated nd filter 58mm






    nd filter
  • (ND Filters) Neutral Density filters can be attached to the lens of a camera to assist in preventing overexposure of an image. Prosumer camcorders have ND filters built in.

  • In photography and optics, a neutral density filter or ND filter can be a colorless (clear) or grey filter. An ideal neutral density filter reduces and/or modifies intensity of all wavelengths or colors of light equally, giving no changes in hue of color rendition.

  • A filter that attenuates light evenly over the visible light spectrum. It reduces the light entering a lens, thus forcing the iris to open to its maximum.





    graduated
  • (graduate) alumnus: a person who has received a degree from a school (high school or college or university)

  • Receive an academic degree from

  • Confer a degree or other academic qualification on

  • gradational: taking place by degrees

  • calibrated: marked with or divided into degrees; "a calibrated thermometer"

  • Successfully complete an academic degree, course of training, or high school











Hapuna + Graduated ND Filter




Hapuna + Graduated ND Filter





It's not that remarkable a composition, but it's a first for me:

This was done about twelve minutes before sunset, and consists of nine images. I had the camera set to ISO 100, Aperture Mode at f/2.8, and wound up with a shutter speed of 1/500 sec for each of the frames.

I also had an 0.6 (2 stop) hard transition graduated ND filter in front of the camera lens. The transition covers about 1/3 of the 58mm filter thread, and was centered on the lens. This brought the sky down within the same range as the rest of the scene.

The composition on this one really wasn't the point. It's an exposure test. But I'm pleased with how it came out. I think I've got a handle on sunset metering from a KAP rig, and I like how the graduated ND filter behaved in the air.

I don't want to run with this setup, though. This was done using a Hitec rectangular filter holder and a 4" adjustable graduated ND filter. The thing is basically a really heavy, really fragile sail. It threw my rig balance off, put extra load on the tilt servo, and acted like a sand magnet. Considering how much these things cost, that's simply not acceptable.

I'd like to get a screw-on graduated ND filter I can throw in my KAP bag for those times when the situation warrants it. This would make it procedurally no different from using a circular polarizer, which my rig is already balanced for.

I'm looking forward to using this technique during Worldwide KAP Week 2010!











Graduate




Graduate





A 1986 Alfa Romeo Spider Graduate that Jamie saw on his commute to work. This is life immitating art. Dustin Hoffman drove an Alfa Spider in the film "The Graduate" and AR decided to make a commemorative model to cash in on the film's popularity. This "poverty" spec model had winding windows, steering was not power-asist, A/C was optional. I owned a Quadrifoglio Spider that had power everything, standard A/C, hard and soft tops, lots of 'Quad-only details. The Graduate was a throw-back to the old days whereas my car was struggling to be as modern as possible for a design that had been around for more than a generation.









graduated nd filter 58mm







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