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Photography Q&A
Washed out long exp shots?
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<blockquote data-quote="spb_stan" data-source="post: 622581" data-attributes="member: 43545"><p>Why would you be putting that many ND filters on to lower the light that much but allow so much light leakage from the VF? There is nothing wrong with the camera or filters(might be poor filters however) but calculate how much light attenuation you added, you will find it was way too much for any useful scene. Are you taking closeup photos of arc-welding? 40 stops of attenuation is far more than needed and will allow very very little light information in, so will be noisy even if you did not let so much light leak in from the VF. </p><p>Experiment with the 4 stop filter and get used to it and than use an 8 and maybe just maybe in very bright conditions you could use an 8 and a 4 but accept the lower resolution due to diffraction in f/22 apertures. Really small apertures can't be as sharp as normal rages due to diffraction. ND filters allow normal apertures in brighter light, but f/22 is going to be lacking sharpness and edge contrast regardless of light on a fine pitch high density sensor like the 24-36 mpx sensors used in recent models. Optimum sharpness is closer to f/5-f/8. </p><p>Set up the camera on the tripod and focus normally at a moderate aperture, say f/8 and and establish correct exposure. Switch to MF, cover the VF so no light can get in( could layers or black electrical tape works well on camera without a VF shutter). Increase shutter speed 8 stops and screw on the ND8 filter. If you need more field depth, increase it by stopping down, but trading DOF for sharpness</p></blockquote><p></p>
[QUOTE="spb_stan, post: 622581, member: 43545"] Why would you be putting that many ND filters on to lower the light that much but allow so much light leakage from the VF? There is nothing wrong with the camera or filters(might be poor filters however) but calculate how much light attenuation you added, you will find it was way too much for any useful scene. Are you taking closeup photos of arc-welding? 40 stops of attenuation is far more than needed and will allow very very little light information in, so will be noisy even if you did not let so much light leak in from the VF. Experiment with the 4 stop filter and get used to it and than use an 8 and maybe just maybe in very bright conditions you could use an 8 and a 4 but accept the lower resolution due to diffraction in f/22 apertures. Really small apertures can't be as sharp as normal rages due to diffraction. ND filters allow normal apertures in brighter light, but f/22 is going to be lacking sharpness and edge contrast regardless of light on a fine pitch high density sensor like the 24-36 mpx sensors used in recent models. Optimum sharpness is closer to f/5-f/8. Set up the camera on the tripod and focus normally at a moderate aperture, say f/8 and and establish correct exposure. Switch to MF, cover the VF so no light can get in( could layers or black electrical tape works well on camera without a VF shutter). Increase shutter speed 8 stops and screw on the ND8 filter. If you need more field depth, increase it by stopping down, but trading DOF for sharpness [/QUOTE]
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Washed out long exp shots?
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