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LENS SELECTION
Lenses vary in their image circle, which is the amount of the image sensor they can
cover:
• The Chronos 1.4 uses a 2/3" image sensor (actual sensor dimensions are 8.45mm x 6.76mm).
• The Chronos 2.1-HD uses 4/3” image sensor.
Lenses designed for smaller sensors can be used, however the image will not cover the
entire sensor. This results in ‘Vignetting’, which is a black ring around the border of the
video.
NOTE: Sample images for each lens offering by Kron Technologies may be found at
https://www.krontech.ca/store/Lenses-c21981409
BACK-FOCUS ADJUSTMENT
• Back-Focus is the distance between the lens mounting flange and the image
sensor. It controls how lenses focus and must be set correctly.
• The camera is set from the factory for the COMPUTAR 12.5-75mm zoom lens.
This setting is correct for most other lenses, but if you are experiencing problems
with focus, this is the first thing to check.
To correctly set Back-Focus for your lens, follow these steps:
PRIME LENSES (NON-ZOOM)
1. Use a lens that has graduated focus (markings showing the focal distance). You
cannot properly adjust Back-Focus on non-graduated-focus lenses.
2. Set the lens to focus at infinity.
3. Loosen the Back-Focus lock screw on the bottom of the camera by about 1 turn
using the included 2mm Allen key.
4. Aim the camera at an object very far away, such as a distant tree.
5. Rotate the entire lens, allowing the CS ring to screw in or out. Adjust the rotation
until best focus is obtained on the distant object.
a. Do not adjust the focus ring on the lens.
b. If the CS ring will not rotate far enough, check to see if your lens requires
a CS-C adapter. Please refer to Pg. 43 for additional details.
6. Tighten the Back-Focus lock screw, finger-tight.
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