ND 400 + ND 110 = how many stop?
- Thread starter Daddypal
- Start date
Hoya ND400: 9 stops
B+W ND110: 10 stops
= 19 stops
Not sure if you can stack them though. Maybe the pros can enlighten us. BTW, may I know why do you need both? Super duper long exposure?
a B+W 110 ND filter reduces light up to 10 stops, thats true,
and i have read that a 400x is a 9 stop filter
edit; too late
and i have read that a 400x is a 9 stop filter
edit; too late
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essentially, u are going to end up shooting in bulb mode... which is kinda roundabout way of just turning your dial to "B", isn't it?
Hoya ND400: 9 stops
B+W ND110: 10 stops
= 19 stops
Not sure if you can stack them though. Maybe the pros can enlighten us. BTW, may I know why do you need both? Super duper long exposure?
Actually it is around 18.5 stops. 18.6 to be exact.
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as pointed out by bojee and bodhi, the total exposure reduction is 19 stops.
Hoya ND400: 9 stops
B+W ND110: 10 stops
= 19 stops
Not sure if you can stack them though. Maybe the pros can enlighten us. BTW, may I know why do you need both? Super duper long exposure?
It is not pratical to stack these two filters together to get a total 19 stops,
the camera meter will no longer able to read the light, you have to manual calculation.
if it is only Sunny f16 condition, the expousre time will be like ISO 200, f8, 6mins
if it is cloudy, the exposure time will be 30mins
if it is in dusk hour, the exposure time will be in hour
if it is in night, the exposure time will be in days
And not to mention, all sorts of problems will start to creep in. like sensor overheating, hot pixels, and in some situations, IR light interference.
Daddypal said:
It is quite simple really.
fixed aperture and iso, metered shutter speed without filter. When add nd110, multiply the shutter speed by 1000. When add nd400, just multiply shutter speed by 400.
yes, follow DD123 suggestion,
after a shot is taken, can be few minute to an hour later, review the shot, adjust the exposure setting for fine tune, take another shot, when untill shot has taken, check and review again.
and very good luck to you if the exposure changed half way during the exposure, eg, clear sky suddenly turn dark, or cloudy change to sunny.
add one more lee big stopper 10 stops.
The exposure time will be days, months and years. ;p
ts. have you consider the type of colour cast you will get when stacking these filters and how difficult it is to remove them?
...just a newbie here...looks interesting...can you elaborate further..i mean, is there any significance between the filter name and its associated stop value when it's come to calculation? a bit confused leh...
for the minimalist, a 10 stops or 9 stops ND filter is good enough for most situation, if you would notice, they usually shoot at soft lighting condition. using two high stops ND filter is really extreme and not practical.
adding one stop means x2 of exposure time. eg. meter at 1/20 exposure time and add a 1 stop filter. You will need to do 1/20 x 2 = 1/10 exposure time.
Any additional stop means an additional of x2. eg. 4 stops filter added for a metered 1/20s means 1/20 x 2 x 2 x 2 x 2 = 0.8s exposure time.
For a 10 stops calculation, 1/20 (x2)^10 = 51.2 sec.
For 20 stops, 1/20 (x2)^20 = 52,428.8 sec or 14.6 hours
30 stops, 1/20 (x2)^30 = 53,687,091.2 sec or 1.7 years.
TS. are you trying to do a moon streaking across the sky photo?
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This picture (http://www.flickr.com/photos/tjintjelaar/5075133469/in/photostream) was taken with 2 x ND110. I guess it depends on what you want to achieve.
For instance, if you want shallow DOF yet long exposure, stacking 2 extreme ND filter is one of the way.
For instance, if you want shallow DOF yet long exposure, stacking 2 extreme ND filter is one of the way.
For Hoya ND filters, the number beside the filter name represents the factor which it will extend your shutter speed by. So ND8 gives you shutter speeds 8 times longer. ND400 gives you shutter speed 400 times longer.
For B+W filters, the model number shows you the number of stops instead - ND106 = 6 stops. ND110 = 10 stops. But if you look at the label on the cardboard box of the ND110, it also list x1000. Which means it gives you shutter speed 1000 times more. 10 stops really meant x1024, but since the box says 1000 times, then just do 1000 times. It is easier to calculate too.
let say the original shutter speed is 1/200sec
after adding a ND110, the shutter speed will be (1/200 x 1000) = (1000/200) = 5 sec
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