The K&F Concept adapter features an elegant and compact design, crafted from high-quality anodized aluminum material. Its key attributes include:

• Allows for infinity focus: The position of the infinity mark [∞] on the telephoto or super-telephoto lens is slightly shifted to the positive side, enabling focus adjustment even when temperature changes cause a focus shift. This shift range is denoted by an L-shaped line, so be sure to check the focus through the viewfinder when shooting at infinity.

• Precise fit: The adapter is designed for a high-precision, perfect fit to ensure optimal performance.

• Manual diaphragm control: The lens diaphragm is manually controlled, as the adapter does not have an automated aperture ring.

When using this adapter, please note the following instructions:

1. Manual adapter without autofocus or aperture ring: This is a manual adapter, so there is no autofocus or automated aperture control functionality.

2. Careful installation: Install the adapter skillfully, without applying excessive force.

3. Vignetting with APS-C lenses: When adapting an APS-C lens to a full-frame camera, vignetting may occur. Some cameras can correct this by adjusting the APS-C settings.

4. Edge-to-edge sharpness with full-frame lenses: When adapting a full-frame lens to an APS-C camera, the smaller image field helps minimize the effects of lens distortion and aberration, providing excellent edge-to-edge sharpness. Additionally, the focal length will be magnified by a factor of 1.6 on Canon, 1.5 on Nikon and Sony, or 2.0 on Micro Four Thirds cameras.

If your camera displays a "No Lens Attached" or "Lens not properly installed" warning message, please follow these steps:

1. Adjust the camera settings: Go to the camera menu, navigate to the setup options, and enable the "Release Shutter without Lens" setting. This will allow the camera to function properly with the adapter.

2. Aperture control: If your lens does not have a manual aperture control ring, the adapter will set the aperture to the maximum value by default. To adjust the aperture, you will need to remove the adapter ring and make the adjustments directly on the camera.

The K&F Concept adapter is a premium-grade product, designed with high precision and quality. Its smooth surface allows for effortless mounting, and the infinity focus feature ensures optimal performance even in challenging conditions.

product information: