Canon HV20 - Tv Mode Exposure Lock Demo
2 years ago
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3. Canon HV20 - Tv Mode Exposure Lock Demo
2 years ago
Here's a demo of before and after footage of night freeway driving comparing default auto exposure to the Tv mode exposure lock trick described on the HV20 enthusiast sites.
I used a Blackberry Curve with its photo viewer and a 75% grey 320x240 JPEG to lock the initial exposure, then adjusted the exposure up +10 for maximum aperture with zero gain using the "half-press" photo button technique to monitor the actual setting.
The auto-exposed version is unnaturally bright and extremely noisy, while the exposure locked and gain optimized version much better represents the actual perceived brightness, with nearly zero gain noise.
Best to view this video full screen non-scaled as the small image playback scaling hides a lot of the auto exposure noise.
I've had this camera for two days and am absolutely thrilled!
I used a Blackberry Curve with its photo viewer and a 75% grey 320x240 JPEG to lock the initial exposure, then adjusted the exposure up +10 for maximum aperture with zero gain using the "half-press" photo button technique to monitor the actual setting.
The auto-exposed version is unnaturally bright and extremely noisy, while the exposure locked and gain optimized version much better represents the actual perceived brightness, with nearly zero gain noise.
Best to view this video full screen non-scaled as the small image playback scaling hides a lot of the auto exposure noise.
I've had this camera for two days and am absolutely thrilled!
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one question... you must have a memory card to do that trick with the photo button or it works without a memory card ?
tanx very much
Use it all the time.... even in daylight and full sun.
well done
I personally prefer the second one
- Steve.
All I did was lower exposure to -11, shot in Cinemode and applied Shadow/Highlight & RGB curves. in PP CS3 post production.
-Brendan
It always feels like I'm doing this sort of stuff different from everybody (Export settings, no gain trick, etc.) Always feels like everyone else's stuff is way better than mine :D Guess that's a good quality though. Always striving for something better.
1 question: What was the f-stop u used before locking the exposure? I read somewhere that f4.8 is the optimal setting you need to use in order to get maximum aperture with zero gain!
Did you lock it at f4.8 and move the exposure upwards too?
What about the brightness settings on your blackberry wouldn't that come into play as well?
Wouldn't it be best to always use black (as in lens cap on when setting exposure lock) so it will always be the same starting point? Or am I just not getting this at all?
Great video footage. I had no idea such a drastic difference could come in low light with these tricks. Makes me love my camera more (if I could just learn how to take advantage of this esoteric knowledge)
hv20.com/showthread.php?t=14958
You don't need a blackberry, even the home screen on a cellphone can be used if you have a bright enough background image.