Kenko Teleplus HD Pro DGX Teleconverter - 1.4x

Yes, it typically reduces autofocus speed slightly because less light reaches the camera's autofocus sensor. Performance can vary depending on the lens and lighting conditions.

The Kenko Teleplus HD Pro DGX series is designed to minimize resolution and sharpness loss. While some minor degradation is inherent in any optical addition, this teleconverter generally performs well for its magnification factor.

This 1.4x teleconverter causes a loss of one full f-stop. For example, an f/2.8 lens will have a maximum effective aperture of f/4 when used with the teleconverter.

It is designed for Canon EF mount lenses. However, compatibility can vary. Always check the official Kenko compatibility list for your specific lens model to ensure optimal performance.

DGX teleconverters are designed to work with both film and digital SLR cameras, providing full automation. DG teleconverters are primarily intended for digital cameras.

This teleconverter is designed for the Canon EF mount. While EF-S lenses also fit EF mount bodies, their image circle is smaller, and using a teleconverter may result in heavy vignetting or is not supported. It is best suited for full-frame EF lenses.

Use a soft lens brush to remove dust. For smudges, use a microfiber lens cloth slightly dampened with a specialized lens cleaning solution. Avoid touching the glass elements directly.

Ensure the teleconverter is securely attached to both the camera and lens. In low light, autofocus may naturally be slower due to reduced light. Try focusing on a high-contrast subject or use manual focus.

Verify that the teleconverter is fully compatible with your specific camera body and lens combination. Re-seat the teleconverter, ensuring it clicks into place on both the camera and the lens.

Confirm the teleconverter is clean and properly mounted. Shoot at slightly smaller apertures (e.g., f/5.6 or f/8) for optimal sharpness. Ensure your shutter speed is fast enough to avoid camera shake, especially at longer effective focal lengths.

Remember that the teleconverter reduces the amount of light reaching the sensor by one stop. Your camera's meter should compensate, but in challenging lighting, you may need to manually adjust exposure settings (aperture, shutter speed, ISO) or use exposure compensation.