Rokinon 14mm f/2.8 IF ED UMC Ultra Wide Angle Fixed Lens w/ Built-in AE Chip for Nikon
The Rokinon 14mm f 2.8 IF ED UMC is a fixed lens ultra-wide-angle lens for Nikon with an aperture of 2.8 and a built-in AE chip for automatic exposure measurement. This lens is designed for use with full-frame cameras and has a focal length of 14mm, making it a great choice for photography of landscapes, cityscapes, and other wide-angle scenes. The lens has a bright, sharp, and contrasty image quality that makes it perfect for astrophotography. It fits in many different cameras from Nikon and other manufacturers as well. It is one of the most affordable lenses you can buy to take pictures of stars. It has a standard optics design with nine rounded aperture blades and a minimum focusing distance of 0.3 meters.
Sigma 150-600mm 5-6.3 Contemporary DG OS HSM Lens for Nikon

Altura Photo 8mm f/3.0 Professional for Nikon Wide Angle Lens Aspherical Fisheye Lens for Nikon
The Altura Photo 8mm f 3.0 Professional for Nikon Wide Angle Lens Aspherical Fisheye Lens for Nikon is a high-quality lens that is perfect for capturing stunning images and videos with a fisheye perspective. This lens is designed to be used with Nikon cameras, and it offers users excellent image quality and versatility. With its 8mm focal length and wide-angle of view, this lens is perfect for capturing expansive landscapes, scenic vistas, and more. This lens is made of top-quality glass and has a large aperture. Hence, it can take pictures of your night sky with more light. It also has a higher resolution and better contrast. This means that you will be able to capture all of the details in your pictures. The lens offers a 1920 x 1080 resolution, which makes it perfect for capturing high-quality images and videos. Additionally, the aspherical glass element ensures sharpness and clarity while shooting in difficult lighting conditions.
Nikon AF-S FX NIKKOR 200-500mm f/5.6E ED Vibration Reduction Zoom Lens with Auto Focus for Nikon DSLR Cameras

Bower Trifid Support Stiftung Camera Extension T-Mount Adapter

YONGNUO YN50mm F1.8N Standard Prime Lens Large Aperture Auto Manual Focus AF MF for Nikon DSLR Cameras
The YONGNUO YN50mm F1.8N Standard Prime Lens Large Aperture Auto Manual Focus AF MF is a high-quality lens that is perfect for users who are looking for an affordable option with a large aperture. This lens is excellent for shooting portraits, landscape photography, and other types of photography, and it also features a manual focus feature which makes it easy to take precise shots. This means that you can use it with your D850, which is an excellent camera in astrophotography. The lens is made out of metal, which ensures that it stays durable and strong even after long-term usage. The 8-elements in 7 groups design make it possible to take pictures at night without a tripod or flash support system. It is also equipped with autofocus and automatic aperture control. This lens is perfect for shooting photos and videos in low-light situations.
Nikon AF FX NIKKOR 35mm f/1.4G Fixed Focal Length Lens with Auto Focus for Nikon DSLR Cameras
Nikon’s AF FX NIKKOR 35mm f 1.4G Fixed Focal Length Lens is ideal for photographers who demand the best performance and accuracy from their equipment. The lens features Nikon’s exclusive auto focus system that ensures quick, smooth autofocus regardless of your camera’s camera settings. Additionally, the high-quality construction ensures that your images will look stunning in both digital and film formats. It has an aperture of 1.4, which ensures that you can take amazing shots even in low-light conditions. This lens also has fixed focal lengths, which means it does not zoom in or out. This makes it easier to photograph and helps you focus on your subject better. You also get two extra-low dispersion elements that will help reduce glass flare, chromatic aberration, and ghosting.
YONGNUO YN35mm F2N Lens 1:2 AF/MF Wide-Angle Fixed/Prime Auto Focus Lens for Nikon DSLR Cameras
Introducing the new YonGNUO YN35mm F2N lens! This amazing lens is designed to provide photographers with a wide-angle fixed prime lens that is perfect for capturing scenic and architectural shots. With its autofocus feature, it is super easy to take great photos without having to worry about missing the shot. It features a 15-point autofocus system and a wide-angle of 35mm. This lens is perfect for photos and videos that require a wide-angle view. It features an autofocus system that is compatible with Nikon DSLR cameras and has a wide-angle design that makes it perfect for capturing wide-angle scenes.

Sigma 10-20mm f/3.5 EX DC HSM ELD SLD Aspherical Super Wide Angle Lens for Nikon Digital SLR Cameras
The first astrophotography lens for your D850 is the Sigma 10-20mm f/3.5 EX DC HSM Lens. It is a wide-angle lens with an aperture of ƒ3.5, which makes it a great choice for photographing the night sky. The lens is also made by Sigma, which is a well-known and trusted brand in the world of optics. This lens has a single aspherical element, which ensures that you get sharp and clear images with minimal distortion at the edges. The lens also has two aspherical surfaces, which makes it durable and shockproof even if it falls from a height of 4 feet or more. This lens has a wide aperture, which allows it to create beautiful and bokeh-like images. The 10-20mm focal length is perfect for capturing wide-angle scenes and its aspherical lens elements provide superior clarity and resolution. The Sigma 10-20mm f 3.
Sigma 24-70mm f/2.8 DG OS HSM Art Lens for Nikon F
Sigma has announced the release of their newest 24-70mm f 2.8 DG OS HSM Art Lens for Nikon F cameras. This lens features a Hyper Sonic Motor (HSM) for fast and quiet autofocus, as well as weather sealing for use in inclement weather. The lens also has a circular aperture diaphragm that produces beautiful bokeh effects when used in conjunction with the lens’ 7-blade Diaphragm. This is a top-quality lens. It has been designed and manufactured with remarkable quality and precision. This is a specially designed lens for the D850 by Nikon. This lens has been optimized for photography, especially astrophotography. Hence, it provides excellent performance for your camera and will provide you with images of the night sky that are crisp and sharp. The lens is available in different versions including Nikon F, Canon EF, Pentax K, Sony A, Sony E, and Sigma SA.
If you are looking for the best astrophotography lens for your Nikon D850, then consider one of the ten lenses listed above. Each lens has its own unique set of features and benefits, so choose the one that best suits your needs. And don’t forget to have fun capturing stunning images of the night sky!