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====== Use gphoto2 to Configure DSLR ======
<color darkorange>Jun 2017</color>
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We can control the settings on our DSLR, again what can be controlled will vary between models. To get a list of items that can (maybe) control, you can use this command.
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<file>
gphoto2 --list-config
</file>
Here is the listing that I get from my Canon EOS 700D.
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<file>
/main/actions/uilock
/main/actions/syncdatetime
/main/actions/autofocusdrive
/main/actions/manualfocusdrive
/main/actions/eoszoom
/main/actions/eoszoomposition
/main/actions/eosviewfinder
/main/actions/eosremoterelease
/main/settings/datetime
/main/settings/reviewtime
/main/settings/output
/main/settings/movierecordtarget
/main/settings/ownername
/main/settings/artist
/main/settings/copyright
/main/settings/customfuncex
/main/settings/autopoweroff
/main/settings/capturetarget
/main/settings/capture
/main/status/serialnumber
/main/status/manufacturer
/main/status/cameramodel
/main/status/deviceversion
/main/status/vendorextension
/main/status/model
/main/status/ptpversion
/main/status/batterylevel
/main/status/lensname
/main/status/eosserialnumber
/main/status/shuttercounter
/main/status/availableshots
/main/imgsettings/imageformat
/main/imgsettings/imageformatsd
/main/imgsettings/iso
/main/imgsettings/whitebalance
/main/imgsettings/colortemperature
/main/imgsettings/whitebalanceadjusta
/main/imgsettings/whitebalanceadjustb
/main/imgsettings/whitebalancexa
/main/imgsettings/whitebalancexb
/main/imgsettings/colorspace
/main/capturesettings/autoexposuremode
/main/capturesettings/drivemode
/main/capturesettings/picturestyle
/main/capturesettings/aperture
/main/capturesettings/shutterspeed
/main/capturesettings/bracketmode
/main/other/d402
/main/other/d407
/main/other/d406
/main/other/d303
/main/other/5001
</file>
So for example, in this list we can see a setting entitled <color #ed1c24>/main/capturesettings/aperture</color> which indicates we can control the aperture on this DSLR.
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To see what the possible values for <color #ed1c24>/main/capturesettings/aperture</color> that <color #22b14c>gphoto2</color> supports, we can use the following syntax.
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<file>
gphoto2 --get-config /main/capturesettings/aperture
</file>
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The 700D DSLR I am using returns the following:
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<file>
Label: Aperture
Type: RADIO
Current: 4.5
Choice: 0 4.5
Choice: 1 5.6
Choice: 2 6.7
Choice: 3 8
Choice: 4 9.5
Choice: 5 11
Choice: 6 13
Choice: 7 16
Choice: 8 19
Choice: 9 22
</file>
So we can see that the current aperture is 4.5 (probably due to the lens I am using) and we have a choice to select  one of the others, lets try to set the aperture to F11.
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We can set the aperture using either the absolute value (11) or the index next to the value (choice 5). Here is an example setting using the absolute value.
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<file>
gphoto2 --set-config-value /main/capturesettings/aperture=11
</file>
If we check the aperture setting now, using the same command as before:
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<file>
gphoto2 --get-config /main/capturesettings/aperture

Label: Aperture
Type: RADIO
Current: 11
Choice: 0 4.5
Choice: 1 5.6
Choice: 2 6.7
Choice: 3 8
Choice: 4 9.5
Choice: 5 11
Choice: 6 13
Choice: 7 16
Choice: 8 19
Choice: 9 22
</file>
We can see now that the <color #ed1c24>Current: 11</color> means that we have set the aperture to F11.
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