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<blockquote data-quote="hark" data-source="post: 376764" data-attributes="member: 13196">You definitely want to determine what the shutter speed is BEFORE you mount the filter. If you have a chance, please consider making a copy of this chart and keep it in your bag. The chart comes from this link: <a href="http://jimdoty.com/learn/exp101/exp_big3/110519_shutter_speeds_j6.jpg" target="_blank">http://jimdoty.com/learn/exp101/exp_big3/110519_shutter_speeds_j6.jpg</a>[ATTACH=full]122889[/ATTACH]You want to use this like a number line. Find the starting shutter speed on this chart that the camera meters when the filter is NOT being used. Then count 9 places and plug in the length of time for the shutter speed when the filter is mounted. If you specifically want a 30 second exposure, the starting shutter speed needs to be 1/15&quot;. Use the lowest ISO possible. If the starting shutter speed isn't 1/15&quot; then you need to figure out what the correct shutter speed should be based on this chart. Otherwise you will either underexpose or overexposure your images.If your starting shutter speed is 1/1000&quot;, then when the filter is mounted, the shutter speed should be 1/2&quot;.</blockquote>

[QUOTE="hark, post: 376764, member: 13196"] You definitely want to determine what the shutter speed is BEFORE you mount the filter. If you have a chance, please consider making a copy of this chart and keep it in your bag. The chart comes from this link: [URL]http://jimdoty.com/learn/exp101/exp_big3/110519_shutter_speeds_j6.jpg[/URL] [ATTACH type="full" width="60%"]122889._xfImport[/ATTACH] You want to use this like a number line. Find the starting shutter speed on this chart that the camera meters when the filter is NOT being used. Then count 9 places and plug in the length of time for the shutter speed when the filter is mounted. If you specifically want a 30 second exposure, the starting shutter speed needs to be 1/15". Use the lowest ISO possible. If the starting shutter speed isn't 1/15" then you need to figure out what the correct shutter speed should be based on this chart. Otherwise you will either underexpose or overexposure your images. If your starting shutter speed is 1/1000", then when the filter is mounted, the shutter speed should be 1/2". [/QUOTE]

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