This document compares the field of view (FOV) specifications and sample thermal images of four thermal imaging cameras: the Testo 885, Flir T335, Fluke Ti32, and NEC G120. It shows images taken from the same distance with each camera's different FOV, and images taken from different distances to capture the same scene section with different FOVs. The Testo 885 has the largest FOV of 30° x 23° while the Fluke Ti32 has the smallest FOV of 23° x 17°. Images of electrical cabinets, engines, and heating systems are shown from varying distances to illustrate the impact of FOV on the captured image area.

1. testo 885 vs.
- Flir T335
- Fluke Ti32
- NEC G120
FOV-comparison

2. 2/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Bildvergleich
Product testo 885 Flir t335 Fluke Ti32 NEC G120
Detector 320 x 240 320 x 240 320 x 240 320 x 240
FOV 30° x 23° 25° x 19° 23° x 17° 32° x 24°
This image comparison shows how the diffrent FOVs influence the image frame of the
individuall camera:
In the first comparison all thermal imagers measure an object from the same distance. So you
can see the different image sections you get with several FOV’s of the thermal imagers.
In the second comparison we tried to get the same image section for every thermal imager
with the different FOV’s. So the objects had to be measured from different distances,
depending on the camera. You will see these different distances in the presentation.

3. FOV-comparison
1. Comparison
Same distance/ different image section

4. 4/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Switch cabinet - 90 cm / 54.4“ distance
testo 885
Fluke Ti32
Flir t335
NEC G120

5. 5/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Switch cabinet - 60 cm / 23.6“ distance
testo 885
Fluke Ti32
Flir t335
NEC G120

6. 6/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Engine - 80 cm / 31.5“ distance
testo 885
Fluke Ti32
Flir t335
NEC G120

7. 7/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Air heating - 3 m / 118.1“ distance
testo 885
Fluke Ti32 NEC G120
Flir t335

8. 8/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Heating loop - 3 m / 118.1“ distance
testo 885
Fluke Ti32
Flir t335

9. FOV-comparison
2. Comparison
Same image section/ different distance
10.06.2013 Autor

10. 10/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Switch cabinet
testo 885 - distance 90 cm / 35.4“ Flir t335 - distance 115 cm / 45.3“
Fluke Ti32 - distance 125 cm / 49.3“ NEC G120 - distance 90 cm/ 35.4“

11. 11/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Switch cabinet
Fluke Ti32 - distance 80 cm / 31.5“
testo 885 - distance 60 cm / 23.6“ Flir t335 - distance 80 cm / 31.5“
NEC G120 - distance 60 cm / 23.6“

12. 12/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Engine
testo 885 - distance 80 cm / 31.5“
Fluke Ti32 - distance 120 cm / 47.3“
Flir t335 - distance 115 cm / 45.3“
NEC G120 - distance 80 cm / 31.5“

13. 13/13Testo AG, Image comparison testo 885, 1000len-mkh, 01.07.2013, Confidentiality 1,
Air heating
testo 885 - distance 3 m / 118.1“
Fluke Ti32 - distance 3 m / 118.1“
Flir t335 - distance 4 m / 157.5“
NEC G120 - distance 3 m / 118.1“