Vivitar 35MM-N 35MMN Lens Manual - Page 9

Camera Settings Some cameras require special settings when using this lens. Please read the information below and set your camera accordingly. The aperture of this 35mm High Speed Aspherical Lens supports a maximum brightness of F1.4. If you take a photo outdoors where there is a great deal of sunlight, you may not get a clear image as the subject you are photographing may be too bright. In such an instance, adjust the brightness to an appropriate level then take the photo. Since the depth of field becomes very shallow at F1.4, if the subject is not focused correctly you may get an unclear image . Therefore, to get a clear image, focus the subject correctly and then take a photo. If the brightness (F number) is set to 4 or larger, you may not be able to set the correct focus due to a difficulty in viewing the subject through the camera viewfinder. Turn the aperture adjustment ring so it is fully open when attaching the lens to the camera. Then turn the aperture adjustment ring again to set the depth of focus and brightness you want prior to shooting. -8-