Hand camera HK 101B add-on
| Started in | 11 January 2023 |
|---|---|
| Contributor(s) | Johan G |
| Status | mature |
| Website | https://gitlab.com/JohanG/hk-101b |
The Hand camera HK 101B add-on adds:
- An additional key binding, ⇧ Shift+F3, that will take a screenshot and optionally will:
- Play a shutter sound.
- Change the field of view to the 35 mm equivalent of 85 mm or 100 mm.
- Hide the menubar, frame latency display, and fps display.
| Note For technical reasons, when changing field of view is enabled, the screen will flicker as the field of view is changed for a few frames when the screenshot is taken. |
Historical background
The HK 101B camera was used to document encountered aircraft when doing visual identification (VID) during interceptions, but also for many of the great photos taken by Viggen pilots over the years.
The camera is modeled after the camera used by many Saab 37 Viggen pilots, Handkamera HK 101B (in English literally "hand camera" HK 101B), a modified Contax 137MA with viewfinder and some controls removed, locked, or painted over. The lenses used seem to mostly have been the Carl Zeiss Sonnar T* f/2.8 85 mm and the Carl Zeiss Planar T* f/2 100 mm, with the 85 mm seeming to be more common.
Challenges when using
- Like in real life there is no view finder, which makes placing the shots a bit more difficult (though unlike real life the camera is always pointing in the same direction as your view).
- You often end up with shots where the subject is out of frame, in particular when aiming for a composition where the subject is not in the center of the frame.
Tips and tricks
Not missing your shots
- It is easier to get the subject in frame when you have them in center.
- Zoom in when you have longer focal lengths, in particular if you have altered it in the property tree (see Tips and tricks below).
- Practice makes perfect. :-P
Choosing other lenses than 85 and 100 mm
Only 85 and 100 mm lenses are selectable from the settings dialog, but you can use the property browser to set another value in /addons/by-id/org.flightgear.addons.hk-101b/settings/lens-focal-length-mm.
21, 24 and 36 mm are popular lens choices for interiors, while 200, 400, and 600 mm are popular among plane spotters (in particular 400 mm).
Keep in mind that the focal length will stay if you close FlightGear with the closing dialog from within FlightGear.
Technical details
Settings
- Settings are persistent and saved between the sessions, provided you close FlightGear with the closing dialog from within FlightGear.
Log file output
The add-on will mention in the fgfs.log file:
- When a screenshot is taken with the add-on.
- When all film is exposed (if you have not enabled automatic reloading).
- When the film is manually or automatically reloaded.
- When settings are changed.