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Messages - lonelyspeck

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Tragic Lantern / Re: Tragic Lantern for EOS M
« on: November 08, 2013, 01:07:46 AM »
Hey guys,

I've been following this thread since the beginning and I've been using the Tragic Lantern nightlies on
As of this post, I'm using the Nov 07 Build. My interest in ML for the EOSM is almost exclusively for enabling time lapse creation. In particular, I'm interested in using the EOSM for day to night time lapse using the the "Flicker Free ETTR Timelapse Workflow" here: ( It's not written for the EOSM but in theory it should work the same.

Auto ETTR works OK for the most part on the EOSM but it hunts for the proper exposure a lot. Tweaking the minimum shutter speed or SNR limits will usually allow you to get it to hit the right exposure but it's usually by trial and error. It's also much slower to converge than Auto ETTR on my 6D (1%'s Oct 14 1.1.3 Build) Once the exposure converges, ETTR on the EOSM seems to do what it is supposed to do for non time lapse shooting (e.g. pressing the shutter button manually with your finger).

The Problem: The bigger issue comes up when I try to use Auto ETTR in combination with the ML intervalometer (Tested with 10-30 second intervals). Once the intervalometer is enabled, Auto ETTR no longer functions. The exposure will remain the same (at whatever it started with) throughout the time lapse sequence, regardless of any changes in light. For example, if Auto ETTR picks ISO 100, 1/125 @ f/16 for the first exposure in bright sunlight, it will remain at that exposure throughout sunset and into night. I've also tried testing this using a variable ND filter to simulate the ambient light change.

I have tested this problem extensively and on various builds and the behavior is always the same when the intervalometer is enabled. I've also tried the other Auto ETTR settings other than Always On such as Auto Snap and even Half S DblClck and manually double pressing the shutter half-way between intervals to try to get it to start ETTRing but it doesn't do anything; it's as if Auto ETTR is disabled.

 Any thoughts?

If Auto ETTR worked with the intervalometer, the EOSM would be the ultimate compact timelapse machine.

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