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General Photography
Transit of Mercury, anyone?
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<blockquote data-quote="BackdoorArts" data-source="post: 717162" data-attributes="member: 9240"><p>When astronomical or atmospheric events occur around here it's a better than even money bet that my corner of NJ will be clouded over. Somehow yesterday it was not, so I found myself climbing down and back up the flight of steps from my home office to the front yard every 10 minutes. These old knees are aching, but I managed to get it.</p><p></p><p>[ATTACH=full]324831[/ATTACH]</p><p></p><p></p><p>Shot with a D500 with 300mm f4 pf + 1.4TCii plus ND400 & ND8 filters. I tried stacking an additional ND4 & ND2 but any additional filters caused reflectivity between them and blurred the image. Exposure varied as the sun rose but ultimately I was at 1/5000 & f/16.</p><p></p><p>I should note that astrophotography is not my thing, so while I could reason out the explanation from my 5 semesters of college physics I should inform you that the path of Mercury you see here is not what I saw straight out of camera. What I got there was more of an arc from the lower left (about 7 o'clock) to the right edge (about 2:30 on the dial). I suspect with the earth's rotation in order to produce a straight line the camera should have been rotated over time instead of remaining level to the ground. I based the line on the median points in the arch and rotated images around the center to line up since it's what I've seen in all other transit composites.</p></blockquote><p></p>
[QUOTE="BackdoorArts, post: 717162, member: 9240"] When astronomical or atmospheric events occur around here it's a better than even money bet that my corner of NJ will be clouded over. Somehow yesterday it was not, so I found myself climbing down and back up the flight of steps from my home office to the front yard every 10 minutes. These old knees are aching, but I managed to get it. [ATTACH type="full" width="60%"]324831._xfImport[/ATTACH] Shot with a D500 with 300mm f4 pf + 1.4TCii plus ND400 & ND8 filters. I tried stacking an additional ND4 & ND2 but any additional filters caused reflectivity between them and blurred the image. Exposure varied as the sun rose but ultimately I was at 1/5000 & f/16. I should note that astrophotography is not my thing, so while I could reason out the explanation from my 5 semesters of college physics I should inform you that the path of Mercury you see here is not what I saw straight out of camera. What I got there was more of an arc from the lower left (about 7 o'clock) to the right edge (about 2:30 on the dial). I suspect with the earth's rotation in order to produce a straight line the camera should have been rotated over time instead of remaining level to the ground. I based the line on the median points in the arch and rotated images around the center to line up since it's what I've seen in all other transit composites. [/QUOTE]
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General Photography
Transit of Mercury, anyone?
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