1. Aperture Priority (AV setting)
This does cause flickering but you can use the Lens Twist method by Dustin Farrell
Or you can de-flicker in post-production with eg. GenArts
2. Bulb Ramping (internal or external software to increase or decrease shutter speed to compensate for changes in light). Most are manual bulb ramping devices so you will have to know what exposure is required at specific times and when the light is going to change ie. what time the sunrises or sets. Google "sunset in..." or "sunrise in..." your shooting location. The Sun Surveyor app is a great little app to know exactly where the Sun and/or Moon will set or rise in augmented reality in your location - http://www.sunsurveyor.com/ (free). Another one to check out is the ever so popular http://www.photopills.com/ for Moon, Sun and Milky Way with time lapse parametres available for Apple and now Android (£10/$10). The Magic Lantern Firmware provides automatic bulb ramping.
2. GB Time Lapse (£60)
3. TriggerTrap (£25)
4. Promo Systems Controller (£200)
5. Timelapse+ (£150)
6. Pulse (£70)
7. https://www.foolography.com/ - (£180)
8. Miops - (£99)
3. Blending (a.k.a. cheating:)
Shoot two time lapses and then blend in post-production with a transition like a cross dissolve.
This is a cut down version of Preston Kanaks blog - click here to view
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