Proper installation protects the sensitive electronic pins and optical elements.
Rotate the macro ring out of its standard indexed zero position.
It features a fast zoom speed (roughly 1.7 seconds from wide to tele) and improved optics to suppress ghosting and flare. Canon YJ18x9B4 SX12 IF 18x BCTV Zoom Lens - AVGear.com
: Internal Focus (IF), meaning the lens length remains constant and the front element does not rotate during focusing. : standard 2/3" B4 bayonet. ES Broadcast Core Review Findings Parfocal Capability canon yj18x9b4 manual top
The lens utilizes an Internal Focus (IF) design. The front optical element remains fixed in place and does not rotate, making the system ideal for matte boxes and specialized filters. Switching Focus Modes
Lighting that allows an optimal mid-range aperture setting (f/4 to f/5.6).
: Positioned in the middle section, containing an integrated threaded socket for a zoom lever pin. This ring can interface directly with the internal electric servo drive unit or turn freely in full manual mode. Canon YJ18x9B4 SX12 IF 18x BCTV Zoom Lens - AVGear
Essential for keeping the image in focus across the entire zoom range. To set this, open the iris fully at the wide end, focus on a chart at the telephoto end, zoom out, and adjust the back focus ring until sharp.
There is no autofocus. The manual is very short on this topic: "Focus manually using the ring." (That’s it. That’s the whole section).
Power on the projector. Use the lens’s motorized zoom and focus controls—either the projector’s control panel or the lens controller. Start with wide angle (9 mm) for small rooms, then zoom toward 18 mm for tighter framing. The iris adjusts exposure; stop down in bright rooms, open up in dim theaters. The servo clicks softly as the zoom traverses its range; focus rings move smoothly when the technician makes fine adjustments. The front optical element remains fixed in place
Approximately 2.3 kg to 2.8 kg (depending on the specific drive unit variant). Mount Type: Industry-standard B4 bayonet . 🎮 Operational Controls
If your image is sharp at 9mm but soft at 162mm, you likely have a back-focus issue. The manual provides a step-by-step guide for the Flange Back Adjustment . This usually involves loosening a set screw and rotating the focus ring to align the focal plane.