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Serious heat issue with Fuze V2

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nexekho:
I've just installed RB, added a blank white image, maxed the brightness in OF, taken a photo with fixed WB/shutter speed/apeture/ISO settings on my S1500, and then played with the brightness in RB until the photos came out pretty much identical.  9 looks about right.  As a side note, it still produces a lot of heat although not as much as when my previous Fuze died.

gevaerts:

--- Quote from: nexekho on July 31, 2011, 09:39:26 AM ---I've just installed RB, added a blank white image, maxed the brightness in OF, taken a photo with fixed WB/shutter speed/apeture/ISO settings on my S1500, and then played with the brightness in RB until the photos came out pretty much identical.  9 looks about right.  As a side note, it still produces a lot of heat although not as much as when my previous Fuze died.

--- End quote ---

So (assuming this can be repeated on some more fuzes), the max. setting should be 9, and we'd be behaving the same as the OF?

yapper:
I've just done some testing and my results indicate that the maximum OF brightness setting corresponds with 12 on Rockbox, and that brightness 20 in Rockbox exceeds the maximum brightness produced by the OF

I used F3.5, ISO64 and and monitored the resultant shutter speed:
Fuze Firmware on max brightness = 1/74 sec
Rockbox brightness 12 = 1/74 sec
Rockbox brightness 13 = 1/74 sec
Rockbox brightness 20 = 1/111 sec

nexekho:
That's a very smart way to do it, I was just comparing the brightness by eye flicking between the two photos.  The viewing angle is probably quite important too as I was slightly off and my tripod isn't very accomodating of the angle I used.  I imagine it is a bit hard to notice as the default theme is considerably darker than OF's.

EDIT:
I just tried the shutter speed method, and found that on my camera (not a DSLR, just a high-end compact) with ISO 400 and F2.8, I get 1/640 for both 100% OF and 12 Rockbox.  So I can confirm the 12 value.  The heat seems to have stopped.

yapper:
Maybe Gevaerts or another dev can shed some light on it, but if the Rockbox LCD code is simply writing the brightness value directly to a register, it would be logical that 1-12 on Rockbox would correspond directly with the 12 brightness steps on the OF.

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