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ottokiksmaler / nx500_nx1_modding

Samsung NX500 and NX1 Modding
GNU Affero General Public License v3.0
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Setting exposure compensation to negative via st command #108

Closed woroko closed 5 years ago

woroko commented 5 years ago

Hi,

This seems like a good place to ask:

Is it possible to set the exposure compensation value (EVC) to a negative value via "st cap capdtm setvar EVC 0xHEXVAL 4" or a similar command? If so, could you advice me on the correct syntax for this?

The reason I am asking is that I want to develop an exposure bracketing script for the Samsung Gear 360 (2017) camera. I have already tested that the above st command works for positive values of EVC. I can see that the Android app for Gear 360 is able to set the EVC to negative values (0xFFE2000A or -1966070), but the st command does not allow this, whether in hex or decimal format.

ottokiksmaler commented 5 years ago

OK, I have tested and I here is what I have st cap capdtm setvar EVC 0x04ff60000 4 will set it to -1 st cap capdtm setvar EVC 0x04ff40000 4 will set it to -13/10 st cap capdtm setvar EVC 0x04ff00000 4 -8/5 st cap capdtm setvar EVC 0x04feb0000 4 -2 st cap capdtm setvar EVC 0x04fe10000 4 -3 st cap capdtm setvar EVC 0x04fd70000 4 -4 st cap capdtm setvar EVC 0x04fcd0000 4 And so on (you can see the progression if you need more compensation).

What I do is when I don't want any auto exposure is:

  1. Enable M mode
  2. Set fixed ISO
  3. Set any Shutter Speed

st key mode m st cap capdtm setusr 5 0x050001;st cap capdtm setusr 0 4;st cap capdtm setusr 1 0x10004 st cap capdtm setvar TV 64 st key click s2 st cap capdtm setvar TV 128 st key click s2

TV value is used for shutter speed =1/2^(TV/16) so for TV=128 TV/16=8 => SS=1/2^8=1/250s (it rounds to nearest possible value).

woroko commented 5 years ago

Thanks, I was able to get negative EVC working with your instructions. Manual mode is still not working, maybe it is not implemented on the Gear 360 2017.