Bulb Raming... Sunrise Mode

[botched]

Greetings! Quick question on using the Sunrise mode while bulb ramping...

Does ML ALWAYS start at 100 ISO, regardless of whether you're doing a sunset or sunrise bulb ramp?

I was experimenting with a sunrise TL using ML 2.3, and I wanted to start at a higher ISO. I'd take my initial reference frame at 1600 ISO, but once the bulb ramping was started, ML changed the ISO 100.

Is there any way to ramp DOWN the ISO instead of up?

[a1ex]

ISO is always set using the 180 degree rule - to get nice motion blur.

If it's dark enough outside, it will start at some higher ISO.

[botched]

I totally understand the 180 rule....

What I'm asking is if there's any way to tell ML to START at at higher ISO, then ramp DOWN.

Currently, if I'm trying to bulb-ramp a sunrise, I set my initial exposure—say 1 second at f5.6 @ 1600 ISO, then I take the reference picture. When I start the intervalometer with bulb-ramping set to sunrise... ML changes my exposure back to 100 ISO, and then starts ramping...

[a1ex]

Stop down the aperture so ML will not be able to get a correct exposure at ISO 100.