The vendor Markins is a long-time friend of Nikonians and has supported the community in various ways throughout the years. They are a manufacturer of top class camera support systems and accessories and its ball head models cover the needs for use on a monopod (Q3i), on a traveler tripod (Q3i-Tr) and on a tripod for medium sized focal lengths (M10i for up to 200mm) and for longer lenses (Q20i for over 300mm).
Four sizes of ball heads are available, with two types of clamps, the Quick Turn Knob Clamp (shown above) and for the Quick Release Lever Clamp (shown below).
BIRDS AND VIDEO MODULE
Now, Markins introduced a clever module attachment that can be used on the Q10i and Q10i-Q, the BV-12, and the BV-22 for the Q20i and Q20i-Q. These modules mount on the ball head clamp (dropped on the open channel) and serve to constrain all camera-lens movements except for up and down tilt, allowing for use of the ball head pan capability. This makes Birds in Flight (BIF) photography and Video (hence the denomination BV) an efficient delight. In fact, the BV module replaces the need for an obtrusive Gimbal head or a Sidekick for BIF and for another head for video.
The BV-12 and BV-22 can only be used on i-Type ball heads, M10Qi, M10Q1-Q, M20Qi and M20Qi-Q.
More articles that might interest you