Here are three (two zoom and one prime) excellent video lenses for Canon EOS R6 Mark II:

1. Canon RF 15-35mm f/2.8L IS USM: This wide-angle zoom lens is ideal for video, offering a versatile focal length range. Its fast f/2.8 maximum aperture allows for exceptional low-light performance and beautiful background blur. The image stabilization helps to minimize camera shake, which is crucial for smooth video footage.

2. Canon RF 24-70mm f/2.8L IS USM: This lens provides a classic standard zoom focal length, making it suitable for a wide variety of shooting situations, from interviews to landscapes. The constant f/2.8 aperture ensures consistent exposure throughout the zoom range, and its excellent image stabilization makes it perfect for handheld shooting.

3. Canon RF 50mm f/1.2L USM: Known for its stunning optical quality and beautiful bokeh, this prime lens is a favorite among videographers for portrait and close-up shots. The f/1.2 aperture allows for incredible low-light performance and a shallow depth of field, making your subjects stand out against a softly blurred background.

For me, Canon RF 50mm f/1.2L USM is the best video prime lens for Canon EOS R6 Mark II, which offers excellent low-light performance and beautiful bokeh, making it ideal for portrait and video work.

For a zoom option, Canon RF 24-70mm f/2.8L IS USM is highly recommended.  

The best video lens for the Canon EOS R6 Mark II will depend on your specific needs and budget. However, here are a few excellent options to consider:

1. Canon RF 24-70mm f/2.8L IS USM

• Versatile focal range ideal for many video situations
• Constant f/2.8 aperture for low light performance and shallow depth of field
• Built-in image stabilization for smoother handheld footage
• Durable, weather-sealed construction
• Price: Around $2,300

2. Canon RF 15-35mm f/2.8L IS USM

• Ultra-wide angle zoom great for vlogging, landscapes, interiors
• Constant f/2.8 aperture throughout the zoom range
• Up to 5 stops of image stabilization
• Fast, quiet autofocus for video
• Price: Around $2,400

3. Canon RF 70-200mm f/2.8L IS USM

• Telephoto zoom lens perfect for interviews, events, wildlife
• Constant f/2.8 max aperture
• 5-stop image stabilization
• Fast, accurate autofocus
• Price: Around $2,800

4. Canon RF 50mm f/1.2L USM

• Fast prime lens for low light and artistic shallow focus
• Extremely bright f/1.2 aperture
• Tack sharp optics
• Smooth, quiet autofocus
• Price: Around $2,300

5. Canon RF 35mm f/1.8 IS Macro STM

• Affordable and compact walk-around prime lens
• Versatile 35mm focal length
• Bright f/1.8 aperture
• 0.5x macro capability
• Built-in image stabilization
• Price: Around $500

The new released Canon RF 35mm F1.4L VCM is a notable addition to the EOS R6 Mark II. Its lightweight design and hybrid features make it an outstanding prime lens choice for both photography and videography.

Canon EOS R6 Mark II is a versatile full-frame mirrorless camera that excels in both photography and videography. Here are three highly recommended prime lenses:

1. Canon RF 50mm f/1.2L USM

   • Description: This lens is part of Canon’s L-series and offers exceptional image quality with a fast maximum aperture of f/1.2. It provides beautiful bokeh, making it ideal for cinematic video work. The fast and accurate autofocus system is a bonus for video recording.
   • Best For: Portraits, interviews, and general-purpose video work.

2. Canon RF 35mm f/1.8 Macro IS STM

   • Description: This compact and lightweight lens features a versatile focal length and a fast f/1.8 aperture. It also includes image stabilization, which is very useful for handheld video shooting. The macro capability allows for close-up shots, adding versatility to your videography.
   • Best For: Vlogging, travel videos, and macro shots.

3. Canon RF 85mm f/1.2L USM

   • Description: Another stellar lens from Canon's L-series, the RF 85mm f/1.2L is renowned for its sharpness, beautiful bokeh, and ability to create stunning portrait shots. Its telephoto reach allows for great compression and subject separation, making it ideal for cinematic storytelling.
   • Best For: Portraits, beauty shots, and narrative filmmaking.

For high end video lens, you can get the RF 24-105mm f/2.8L IS USM Z lens.

One of the best video lenses for Canon EOS R6 Mark II is  Canon RF 24-70mm f/2.8L IS USM. This versatile zoom lens offers excellent image quality, a fast constant aperture, and image stabilization, making it ideal for various shooting conditions and styles.

Based on popularity, performance, and versatility for video work, these three lenses stand out for your Canon EOS R6 Mark II:

1. RF 24-70mm f/2.8L IS USM

• Perfect all-rounder with constant f/2.8 aperture
• Built-in image stabilization complements the R6 Mark II's IBIS
• Silent and smooth autofocus for video recording
• Professional L-series build quality with weather sealing

2. RF 50mm f/1.2L USM

• Exceptional low-light performance with stunning bokeh
• Cinematic look with shallow depth of field
• Excellent center-to-edge sharpness even wide open
• Fast, accurate focus transitions for video

3. RF 15-35mm f/2.8L IS USM

• Ultra-wide to standard focal range ideal for vlogs and landscapes
• Constant f/2.8 aperture throughout the zoom range
• Optical image stabilization for smoother handheld footage
• Minimal focus breathing for professional-looking shots

All three lenses feature Canon's RF mount, designed specifically for their mirrorless systems, providing optimal performance with Canon EOS R6 Mark II.