Bulb-mode long exposures need a timer. Enter the metered shutter speed and your ND filter strength, then start the countdown — the page beeps 10 seconds before the end and when to close the shutter.
How to use the Long Exposure Timer (ND)
- Meter without the filter and set the base shutter.
- Choose the ND strength.
- Open the shutter and press Start at the same time.
FAQ
Why does my long exposure look blue or magenta?
Many strong ND filters add a color cast; fix it with white balance in RAW.
Related tools
ND Filter CalculatorExposure Value (EV) CalculatorSunny 16 CalculatorLux to Exposure CalculatorExposure Stops ConverterISO Equivalent Exposure CalculatorHDR Bracketing CalculatorMoon Exposure Calculator (Looney 11)Reciprocity Failure Calculator (Ilford)Video Shutter Angle & ND Calculator
Embed this tool on your site
Free to embed on blogs, club websites and forums — copy the code below. A small credit link is included.