Bulb mode

Hi Mark,

Was it blank white or black? Would be useful to have the EXIF from the shot. What was the exposure time? Unless you were using an ND filter anything over a couple of seconds would be likely to blow out completely and show as pure white.
 
It could be that the camera was doing a noise reduction exposure which will last as long as the exposure itself, only after that can you see the picture.
 
What was the exposure time and how strong was the filter?
 
With an ND4 (if thats what you mean with 0.4) at 10 seconds would be equal to between 2.5 and 3 seconds exposure time without the filter so unless it was getting dark it'll be over exposed.
 
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Martyn D said:
With an ND4 (if thats what you mean with 0.4) at 10 seconds would be equal to between 2.5 and 3 seconds exposure time without the filter so unless it was getting dark it'll be over exposed.
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^^this^^
 
With a ND4 to get an exposure of 1/250 it would only be 1/30 so won't get the effect your after...in daylight you need something like a 10 stop filter, that'll give you about 8 seconds exposure time.
Why not try at dusk when it'll naturally be longer exposure and a bit long with the ND4
 
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taff63 said:
So how long exposure time would you suggest I go for next time also would you go down a filter size
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the right time for the aperture and iso ,use the light meter in the camera
 
I use an excellent little AP on my android smart phone to help with the calculations for long exposure shots, it allows you to meter the scene with the in camera meter in before applying filters, switch to a full manual mode and adjust aperture, ISO setting or apply filters to get the desired length of exposure to create the effect you are trying to achieve.
 
taff63 said:
Was a 0.4 and was on cable release so think bout 10scs
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ND 0.4 optical density is unusual, but would be about 1.3 stops (0.3 is one stop, 0.6 is two stops). Four stops exposure factor is ND16.

Either way the filter doesn't seem anywhere near dark enough for ten seconds exposure in daylight.
 
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