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Hello,

why it is not possible to set an intervalometer with less than a second for example I want to setup a timelapse with shutter speed 1/4 of a second and interval 1/2 second I can set that time to 0m:0s.5 but the start button is grayed.

thanks for your help

The 1/2 second interval will not work.
When a capture is initiated the camera will capture the image, store it on the SD card and finally notify the remote application about it.
This all needs time (depends on camera, used SD card, etc. and it can be like 3-5sec) and until it is finished the remote application can't start another capture.