Official Question Thread! Ask /r/photography anything you want to know about photography or cameras! Don't be shy! Newbies welcome!

Essentially, my question is this: Do interval timers begin counting down at the BEGINNING of the first exposure - i.e. the exact moment the shutter button is pressed for the first image - or do they start AFTER the end of the first exposure, after the image has been recorded onto the storage medium?

Recently I was doing some shooting to create a timelapse, which turned out fine, but while I was shooting I think the sensor began to overheat? I would get a BUSY prompt for a decent amount of time before being able to use the camera again, and suddenly it shut off. It still works, nothing wrong with it, and it was about 80 something degrees that night and fairly humid.

I've never messed with timelapses before buying this camera (Canon 90D). The 90D, like many others, have an interval timer. For this particular instance, I was shooting at night, with exposure times set between 25 and 30 seconds, as I think I changed it midway through shooting. The interval time was set to every 60 seconds (38 exposures over 45-ish minutes minus bad shots and issues with overheating). It got me thinking about the interval timer, and I was wondering if interval timers on cameras are the same or if they all do things differently.

I've been hearing about the R5 overheating quickly, and it just raised the question about what a reasonable expectation is for how long a camera can go before overheating. I know the R5 is mirrorless and entirely different from my 90D, but I still wonder about overheating, especially when I took a timelapse that lasted 8-ish hours and the camera didn't overheat then. Probably about the same temperature but with no humidity.

/r/photography Thread