Sunday, October 28, 2012

Nikon DSLR battery project, 4S LiPo testing

Project test continues with 4S LiPo battery (Orion 14.8V 6400mAh). Only D200 camera was powered. I used four diodes as voltage dropper (1N3879 switching diode). This solution is only temporary, more sophisticated one would be low loss switch mode voltage converter....

camera setup
Nikon D200
300/4.5 lens (at max aperture)
raw images used
menu: high ISO NR, off
menu: long exposure NR, off
"M" mode used
bulb exposure selected
camera at room temp, approx +23C

exposure setup
MC36 trigger used
delay 10sec
exposure 60sec
interval 62sec
no limit in image count

Results (27th Oct)
Diodes heat up a bit during testing, without heat sink used. Test was stopped, when voltage per cell approx at 3.5V level (some cells were 3.2/3.3V, two last at 3.6V, slightly uneven discharging). Totally 472 images were taken. It corresponds to three times more images, than in 3S LiPo 2100mAh test setup.

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