INSIDE PHOTOGRAPHY SEPTEMBER,2017

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B e h i I came across star trail for the first time at Navoneel 2012 organized by Sky Watchers Association of North Bengal. I was fascinated by the fact that every star told swan through star trail. I was amazed that a star which itself is just a light dot for us can even speak! I really found that a photographer if wants, can make a star speak and from that very moment the idea of clicking star trail inculcated in my mind. Finally I got the chance of clicking star trail this year. Now the question is why do we see star trails?
1) clear sky 2) remote control shutter release / intervalometer 3) tripod 4) camera 5) wild angle lens d T h e L e n s n y R u d r a S h e k h a r D a s B We know that earth rotates on its own axis from west to east in every 24 hours. That means it rotates 360 degrees in 24 hours, which makes 15 degree rotation in one hour and in every 4 minutes rotates one degree. I was able to get an exposure of 67 minutes and 30 seconds because after that the sky was overcasted with clouds. Now as per the previous calculation of the exposure I got the trail of 16 degree, 52 minutes and 30 seconds. In this context I must mention to minimize noise reduction I took a dark frame by attaching a lens cap. Requirements to click a star trail: Predetermination Infinite focus : To get an infinite focus one has to fix the camera on the tripod and set the lens on manual focus keeping the live view on. Then zoom in and when the stars appear as a dot you get an infinite focus. Exposure determination: While determining the exposure we have to keep in mind that the black portion of the sky doesn't appears grey or else the faint appearing stars won't be visible. Set up: I didn't had any tripod. I just took the camera and kept the lens towards the sky giving an exposure of 30 seconds. I went on clicking photos one after the other and at last I took a dark frame, since I knew that if the camera is on for a long time it gets heated up and the level of noise increases gradually. To reduce this noise I took the dark frame. Processing: The processing of the photos was done by using a software named star track. I commanded the software to add only the brightest points. Next the output was copied thrice, since for gap filling minimum three photos are required. An object named threshold is present in gap filling which enables the pixel size to either become small or big. As two photos have been merged it had a little gap, which was filled in by increasing the pixel size.
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