Nikon AF Nikkor 14mm f/2.8D ED User's Manual

To achieve the best sharpness, use an aperture around f/8 to f/11. Ensure the lens is properly focused and use a tripod to minimize camera shake.
The lens does not support front filters due to the bulbous front element. Consider using a filter holder system designed for ultra-wide-angle lenses.
To reduce lens flare, avoid shooting directly into bright light sources. Use lens hoods when possible and position yourself to keep the sun or bright lights out of the frame.
Use a blower to remove dust, then gently clean with a microfiber cloth. For smudges, use lens cleaning fluid applied to the cloth, not directly on the lens.
Yes, the wide aperture and ultra-wide-angle view make it suitable for astrophotography, capturing expansive night skies.
Distortion is common in ultra-wide-angle lenses. Use lens correction profiles in editing software like Adobe Lightroom to correct it.
Ensure the camera's firmware is up to date and consider fine-tuning the autofocus settings in your camera for optimal results.
The minimum focusing distance is approximately 0.2 meters (0.66 feet). This allows for close-up wide-angle shots.
The f/2.8 aperture allows for good performance in low-light conditions, making it suitable for interiors and night photography.
Ensure the lens and camera mount are clean and free from debris. Align the lens properly and gently twist until it clicks into place. If issues persist, consult a camera technician.