There are several Minecraft shaders that are considered to be very realistic. Here are some of the most popular ones:

• Continuum Shaders: This is considered to be one of the best photorealistic shaders for Minecraft. It packs every top-of-the-line feature you could want, including ray tracing, global illumination, and ambient occlusion.

• SEUS: This shader pack is known for its impressive shadow work and realistic lighting effects. There are several versions available, including SEUS PTGI and SEUS HRR, which are RTX shaders that require a powerful graphics card.

• KUDA Shaders: This is one of the most popular shader packs of all time, thanks to its well-made addition with very few bugs and a high degree of customization options. It strikes a pleasing balance between soft and realistic, and it’s not too demanding on your computer.

• Sildur’s Vibrant Shaders: This shader pack magnifies Minecraft with amazing effects to the point that it resembles a completely new game. With blown-out lighting and saturated colors, it is one of the most intense graphics mods out there for Minecraft, but it is also highly configurable for those who want to change things up.

• Naelego’s Cel Shaders: This shader pack has a distinctive appearance that makes Minecraft look like a cartoon. While it may not be the most realistic shader pack, it is still worth checking out for its unique style.

Its worth noting that the "best" shader pack is subjective and depends on personal preference and computer specs. Some other popular shader packs include Chocapic13s Shaders, BSL Shaders, and Voyager Shaders.