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<blockquote data-quote="Joseph Bautsch" data-source="post: 5359" data-attributes="member: 654"><p>Michael - I should have put mind in gear before posting the above statement. I should have explained how filters have an effect on f/stops.&nbsp; The correct answer is yes and no. If you set the camera on, &quot;Aperture Priority&quot;, f16 and you add a two stop neutral density filter the DOF is based on f/stop, f16. In this shooting mode the f/stop is locked in and does not change even with a two stop ND filter. Your calculations are based on the Aperture Priority setting of f/16. The exposure will be two stops down because of the ND filter will slow down the shutter speed and not effect the f/stop. If you set the camera on &quot;Shutter Priority&quot;, and add a two stop ND the metering system will read the exposure through the filter and reduce the f/stop by two stops. In this mode the shutter speed is locked in and the f/stop is allowed to change by two stops. In this case your calculations would be based on f/8 which is two stops down from f/16. Most advanced amateurs and professionals shoot in the &quot;Aperture Priority Mode&quot; and set the f/stop they want. That is the recommended shooting mode. Use shutter priority only in cases where maintaining a certain shutter speed is more important than the f/stop. Hope this is more help than my first post.</p></blockquote><p></p>

[QUOTE="Joseph Bautsch, post: 5359, member: 654"] Michael - I should have put mind in gear before posting the above statement. I should have explained how filters have an effect on f/stops. The correct answer is yes and no. If you set the camera on, "Aperture Priority", f16 and you add a two stop neutral density filter the DOF is based on f/stop, f16. In this shooting mode the f/stop is locked in and does not change even with a two stop ND filter. Your calculations are based on the Aperture Priority setting of f/16. The exposure will be two stops down because of the ND filter will slow down the shutter speed and not effect the f/stop. If you set the camera on "Shutter Priority", and add a two stop ND the metering system will read the exposure through the filter and reduce the f/stop by two stops. In this mode the shutter speed is locked in and the f/stop is allowed to change by two stops. In this case your calculations would be based on f/8 which is two stops down from f/16. Most advanced amateurs and professionals shoot in the "Aperture Priority Mode" and set the f/stop they want. That is the recommended shooting mode. Use shutter priority only in cases where maintaining a certain shutter speed is more important than the f/stop. Hope this is more help than my first post. [/QUOTE]

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