1 second is more like .80 seconds, CLA?

[aad]

Of course, if the speed isn't close enough, just keep shooting. It will change over time.

 

[Mackinaw]

The tolerance level is around +/- 15 to 20%, particularly at the extreme ends.

Out of curiosities sake, I just pulled out an old 1982 "Popular Photography" magazine and noticed they used +/- 25% as their tolerance band for most speeds. The allowable error jumped to +/- 32% for speeds faster than 1/500th.

Jim B.

 

[Chris101]

Anyone with an old 'turn-table' can put a white dot on a record (not a collectable one!) and photograph it at any consistant speed. The angle will directly translate to shutter speed.