When using a manual lens, the camera should be set to mode. Since manual lenses lack electronic contacts for lens recognition, the inability to automatically adjust exposure values may result in photos that are too dark or too white. Manual setting of ISO, Aperture and shutter speed is required. Manual lenses do not have an electronic contact, is displayed because the camera is unable to acquire aperture information. At the same time, the aperture information cannot be adjusted from the camera, and the aperture value F/1.8-22 can only be adjusted by the len's Aperture Ring. How to use the manual lens? You can not press the shutter after attaching. To resolve this, Enable "Release shutter w/o Lens". Tips to use our Manual Lens: 1) Set the Release shutter w/o Lens option in the camera menu to Enable. 2) Set the mode dial to Manual (M). Note that the aperture value will not be displayed (it will show " "). The aperture F1.8-22 can only change by adjusting the "aperture ring" on the lens. Why can't I press the shutter after mounting the lens? Please do Enable the "Release shutter w/o lens". after enabling "Release shutter w/o lens" and switching to M, you can press the shutter to take a picture. Why does my picture out of focus and very blurry? For manual lenses, you must turn the focus ring on the front of the lens to focus. If the photo is still blurry after focusing sharply, please adjust the exposure by ISO/aperture/shutter speed. Why it show "F00"? and How to adjust the aperture value? Manual lenses do not have an electronic contact, "F00" is displayed because the camera is unable to acquire aperture information. For manual lenses, the aperture value can only be adjusted with the aperture ring on the lens. How to do if the image turns out dark? Decrease Shutter Speed(e.g., from 1/1000s to 1/250s) to capture more light; Increase ISO: Raise ISO sensitivity to increase the camera’s sensitivity to light; Increasing aperture through the aperture ring on the lens. How to do if the image turns out bright? Decrease Shutter Speed (use a faster shutter, e.g., 1/500s instead of 1/100s) to reduce the exposure time; Lower ISO: Reduce ISO sensitivity to lower the overall exposure; Decrease aperture (increase f-number) through the aperture ring on the lens.