Syma X1 returns
Finally got sound from the Canon T4I. It's not always in focus, but it's a real narrow depth of field & real expensive lens.
Many years ago, the feedback algorithm went to a fixed integral step for all error. Today, it went back to a variable integral step & got a lot more stable. The Syma X1 is the most unstable vehicle in the indoor fleet. It usually can't take off successfully.
Also, the award winning follower amplifier
failed. It appeared to have a resonant oscillation when plugged into the Syma remote control. It oscillated at 40khz. The Syma may have drawn current at just the right frequency to resonate with the slow op-amp. So it's back to no follower amplifier & it works perfectly. There's a risk of any active component creating an oscillation.
The T4I took some comparison photos with the 5D. The 5D's only use now is the larger frame.
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