In this post I would like to compare the Horizontal FOV of the Front, Rear, and Interior cameras.
The A229 Plus 3-CH has a specification of 140° + 160° + 150° + FOV.
I updated my work bench with more wallpaper, and a ruler.
I’m hoping the additional wallpaper will help identify focus issues.
I’m hoping the ruler will make it easier taking measurements.
I adjusted the distance of my platform jig so the camera lens is 50 centimeters from the wall.
Shoutout to
@Karagandinez and
@gse for helping me with that.
I made a new platform jig because
@Nigel suggested the camera lens should be the same height as the ruler.
The jig is now 11 inches tall, the same height as the bottom of the ruler.
The center of the lens is the same hight as the center of the ruler.
I made sure the jig was “square” with a level, if the image looks “tilted” it’s possible the lens in not “aligned”.
Here are the Horizontal measurements in the center of the recorded footage;
Front: 124.5cm
Rear: 144cm
Interior: 180cm
Interior LED’s On: 90cm
Shoutout to
@DT MI for telling me about the Right Triangle Calculator, and
@rcg530 for helping me understand it.
Now that we know the Horizontal measurement, and the distance from the lens to the wall we can calculate each camera’s Horizontal AOV.
Here are the “true” Horizontal AOV’s;
Front: 102°
Rear: 110°
Interior: 122°
Interior LED’s On: 84°
Looking at the screenshots three things stand out to me;
1.) The A229 Plus Front is 10° narrower than the A229 Pro Front (112°).
2.) The Rear & Interior cameras are identical to the A229 Pro’s.
3.) When I turn off my garage lights, and the Interior IR LED emitters illuminate the AOV is reduced, and a lot of information is lost on the sides of the image.
I wonder how the A139 Pro IR Interior camera will compare since it has 6 IR LED emitters, instead of the 4 on the A229 Pro.
I guess I will test the A139 Pro 3-CH next.