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Ambient Noise - Desktop PC

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Using a miniDSP UMIK-1  calibrated microphone, I recorded sound pressure level (SPL) at 1m away from the PC: Ignore the random peaks. They're from door of the study room being opened and closed. From 0 to 1:30, SPL averages around 46.5dB . Windows 10 power setting at balanced-mode. From 1:30 to 5:30, I loaded and played Deliver Us The Moon game (EPIC settings). Windows 10 power setting at high-performance mode. SPL averages around 51dB . From 5:30 onwards, I closed the game and PC went back to balanced-mode. With this data, I should be able to quantify difference between the stock cooler and new cooler which should be with me next week.
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HDR with Nikon D90

If you enjoy taking HDR images, then you know that the more exposure reference you have, the better HDR image result will be as transition is smoother and more realistic looking. So how many exposure reference is needed? Between 3 and 9 is optimal depending on image scenario. With Nikon D90 (or D80), bracketing has 3 options: 3F, +2F, and -2F. For better HDR work, always set +/-2EV for F. So by default, D90 can achieve 0EV, -2EV, and +2EV in one setting (3F). This is my default option when doing casual HDR images. But for serious or really extreme scenario, I usually employ 9 exposures. Here's my step: 1) Use a tripod to minimize post-processing alignment. 2) Turn OFF Auto ISO and set a fix White Balance value (or shoot in RAW to fix WB later). 3) Use aperture-priority mode. For landscape work, f8 and above (smaller aperture opening) is recommended. 4) Make sure exposure compensation is set at 0EV. See page 90 of Nikon D90 manual. 5) Make your composition. Focus and then disable au...
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