DSLR Camera Initialization

[wtgee]

• When setting default properties of the Canon camera, use the values rather than the index settings, which seem to be more consistent across models.
• Don't double quote the radio option values.

Closes #1251

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.21%. Comparing base (b93d547) to head (ff76195).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1252      +/-   ##
===========================================
- Coverage    70.22%   70.21%   -0.02%     
===========================================
  Files          100      100              
  Lines         8399     8399              
  Branches      1164     1164              
===========================================
- Hits          5898     5897       -1     
  Misses        2352     2352              
- Partials       149      150       +1     

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