This FRA-4X32C Riser Assembly from Field Optics Research is a center column extension for Field Optics Research tripods. A bottom 3/8"-16 accessory thread allows it to be attached to tripods or other support systems that feature a 3/8"-16 mount, including for use as an extension to an existing center column.

The FRA-4X32C Riser Assembly features a 4" height, a reversible 3/8"-16 and 1/4"-20 mount along its top, and it is constructed from carbon fiber to maximize durability while remaining lightweight. it includes a column top disc.

4" Center Column Extension    3/8"-16 / 1/4"-20 Reversible Mount    3/8"-16 Accessory Thread    Carbon Fiber Construction

Related Questions and Answers

Q: 1. What is the length of the exposed bolt after the swivel bearings and hold down nut are installed?

A: When the Glide Gear Dolly Track Swivel Wheel Assembly is fully assembled, The bolt and swivel bearings are no longer visible.

Q: 2. How about vibration transfer? Should a second riser be used adjacent to the camera riser?

A: This will all depend on where you are shooting and what this riser is sitting on. However under normal circumstances vibration should not be seen in your shots.

Q: 3. What type of screws are used to attach the lens support on the riser? Need to know if I can use a screw with a looped end so I can add a handstrap to my cage.

A: Don't know the exact size without some research. It takes a 3mm hex key and is probably a metric size like the rest of the screws on the cage, only larger. Its tapped hole would not take a standard looped tripod screw since it's a bit smaller than a 1/4 tripod screw. The riser screw drops into a 1/4-20 tripod threaded hole.

Q: 4. How about on grass?

A: Yes, the Axler Portable Medium Duty Shooting Riser (4 x 4') can be used on grass.

Q: 5. Can these platforms be connected to increase the platform size?

A: The Axler Portable Medium Duty Shooting Riser is designed for stand alone ( one at a time) use and is not designed to link with other Axler Riser or create a floor.

Q: 6. What size track work best with these wheels? Does PVC track work well with these wheels?

A: These wheels are meant to be used on the movie industry standard size for dolly track pipe which is 1 1/2 . I imagine they will be fine on pipe anywhere from 1 to 1 3/4 . They should work fine on PVC as well as stainless or chrome dolly track.

Q: 7. is there a set screw to secure the ball head to the top of the adapter?

A: There is no known set screw. It is our opinion that a good twist will hold it in place for as long as you want it.

Q: 8. Any recommendations for a ladder that works well with the 4 x 4'?

A: The Axler Portable Medium Duty Shooting Riser (4 x 4') can work with any standard ladder solution. Telesteps Folding Single Sided Stik Ladder (5') BH #TE500FLS https://bhpho.to/3MIfjwl

Q: 9. How stable is this for an interior shoot on a level concrete floor? Any movement transferred to the tripod/camera? Also does it make any noise if you carefully shift around on it to check camera settings?

A: This riser has a 450 pound weight capacity, it will very stable. We are not aware of it making any noises either.

Q: 10. Would this kind of platform work on bleachers? Would I need to put something underneath the legs to keep it even and steady?

A: The Axler Portable Medium Duty Shooting Riser (4 x 4') is a 4ft x 4ft riser platform that requires as much space for setup. The legs are all equal height, so should it be used in a location where the ground is not level, you may need to put something under the legs to keep the platform steady and secure.