Shutter speed between 25 and 30 seconds

[mbkona]

HI! I have a 5D Mark iii and have been shooting the Milky Way. I would like to be able to set the camera to shutter speeds between 25 and 30 seconds...like for example 27 seconds. Is there a setting to change? On my camera, it jumps from 25 to 30 seconds and nothing in between. Thanks!

[ScottyP]

Not unless Magic Lantern will do that.

[RobertTheFat]

Maybe you could use one of the oddball shutter speeds that do exist modified by an incremental exposure correction. I have neither the time nor the patience to compute any of the possible values, but the math wouldn't be difficult.

[Peter]

Magic lantern or this one http://www.cyberphoto.se/nikon/mc-36.jpg

[TCampbell]

An intervalometer will do it in bulb mode (you can dial in any amount of time you want).

But I suspect 3 seconds really wont make much of a difference.... that's just a 1/10th of an exposure stop. Usually you wont notice much of a difference with merely a 1/10th stop difference.