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Star Trail Help
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<blockquote data-quote="andy1read" data-source="post: 156172" data-attributes="member: 12426"><p><span style="color: #222222">Hi,</span></p><p><span style="color: #222222">I was practising getting the right Shutter speed/ISO/Aperture settings last night for stacking star trails in my garden. I decided on ISO 400, 120 seconds, F4.5 which seemed OK.</span></p><p></p><p><span style="color: #222222">I took 18 photos and after stacking them, I noticed there was a glitch in the trail, I found it was the 5th photo, and was about the first 1/4 of the trail on that photo where the star had move down for about 30 seconds then reverted back to the same line it was previously.</span></p><p></p><p><span style="color: #222222">The tripod I use is a Manfrotto MT293A4, with a 494RC2 Head, the tripod wasn't fully extended, it was on solid wooden decking, there wasn't any wind.</span></p><p></p><p><span style="color: #222222">Does anyone know what might cause this, I had a problem at Christmas time doing a Star trail of Mount Teide in Tenerife where the trail wasn't smooth.I assumed that was because the ground was sand/dirt(although</span><span style="color: #222222"> there wasn't any wind then so there was no reason for it to move).</span></p><p></p><p><span style="color: #222222">Star trails take a lot of time, and the only way to find out if its OK is after stacking</span><span style="color: #222222"> , so I'm hoping to avoid this happening again.</span></p><p></p><p><span style="color: #222222">Here is the photo that was wrong.</span></p><p></p><p>[ATTACH]39157[/ATTACH]</p><p></p><p><span style="color: #222222">This was as part of the trail(not sure how easy it is to see in this photo)</span></p><p>[ATTACH]39156[/ATTACH]</p><p></p><p><span style="color: #222222">If the trail moved slightly and continued on a different line, then I would think the Camera/tripod moved. But as it reverted back after about 30 seconds to the original line I don't see Camera/ tripod movement could cause this(unless it moved twice)</span></p><p></p><p><span style="color: #222222">I have noticed the MC2 quick release on the tripod, when screwed to the camera doesn't have a great contact area on the camera. I intend to replace the head with a Manfrotto 498MC4 which has a larger quick release plate. Although I don't see any slight wobble would cause this in a star trail.</span></p><p></p><p><span style="color: #222222">Is it possible anything in the camera mechanism, or Lense might cause this, is there anything that could move a small amount and slightly move the image? ( Vibration control on the lense was turned off)</span></p><p></p><p><span style="color: #222222">Any help in what might cause this would be appreciated ,I'm hoping for some clear skies tonight so I can try some more Star trails.</span></p><p></p><p></p><p><span style="color: #222222"> Thanks,</span></p><p><span style="color: #222222"> Andy</span></p></blockquote><p></p>
[QUOTE="andy1read, post: 156172, member: 12426"] [COLOR=#222222]Hi,[/COLOR] [COLOR=#222222]I was practising getting the right Shutter speed/ISO/Aperture settings last night for stacking star trails in my garden. I decided on ISO 400, 120 seconds, F4.5 which seemed OK.[/COLOR] [COLOR=#222222]I took 18 photos and after stacking them, I noticed there was a glitch in the trail, I found it was the 5th photo, and was about the first 1/4 of the trail on that photo where the star had move down for about 30 seconds then reverted back to the same line it was previously.[/COLOR] [COLOR=#222222]The tripod I use is a Manfrotto MT293A4, with a 494RC2 Head, the tripod wasn't fully extended, it was on solid wooden decking, there wasn't any wind.[/COLOR] [COLOR=#222222]Does anyone know what might cause this, I had a problem at Christmas time doing a Star trail of Mount Teide in Tenerife where the trail wasn't smooth.I assumed that was because the ground was sand/dirt(although[/COLOR][COLOR=#222222] there wasn't any wind then so there was no reason for it to move).[/COLOR] [COLOR=#222222]Star trails take a lot of time, and the only way to find out if its OK is after stacking[/COLOR][COLOR=#222222] , so I'm hoping to avoid this happening again.[/COLOR] [COLOR=#222222]Here is the photo that was wrong.[/COLOR] [ATTACH=CONFIG]39157[/ATTACH] [COLOR=#222222]This was as part of the trail(not sure how easy it is to see in this photo)[/COLOR] [ATTACH=CONFIG]39156[/ATTACH] [COLOR=#222222]If the trail moved slightly and continued on a different line, then I would think the Camera/tripod moved. But as it reverted back after about 30 seconds to the original line I don't see Camera/ tripod movement could cause this(unless it moved twice)[/COLOR] [COLOR=#222222]I have noticed the MC2 quick release on the tripod, when screwed to the camera doesn't have a great contact area on the camera. I intend to replace the head with a Manfrotto 498MC4 which has a larger quick release plate. Although I don't see any slight wobble would cause this in a star trail.[/COLOR] [COLOR=#222222]Is it possible anything in the camera mechanism, or Lense might cause this, is there anything that could move a small amount and slightly move the image? ( Vibration control on the lense was turned off)[/COLOR] [COLOR=#222222]Any help in what might cause this would be appreciated ,I'm hoping for some clear skies tonight so I can try some more Star trails.[/COLOR] [COLOR=#222222] Thanks,[/COLOR] [COLOR=#222222] Andy[/COLOR] [/QUOTE]
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