Wimberley FAQs and Support Topics

C-12 vs. C-30 Quick-release (QR) Clamp

Our larger, 4.2 inch long C-30 quick-release clamp was originally designed to be mounted on the lens support platform of our classic Wimberley Head, model WH-100 (non-QR), to make it an optional quick-release tripod head. It was designed to fit the geometry of the large support platform, and to securely clamp the heaviest of telephoto lenses that were in production in the early to mid 1990’s. The clamp quickly became a standard component of the classic Wimberley Head, model WH-101, as the quick-release technology became popular.

A smaller, 2.5 inch long quick-release clamp (the discontinued C-10 clamp) was developed a bit later as a more versatile, QR clamp. It offered the same mechanical advantage as that of the C-30 without the bulk and heavier weight. The C-10 clamp was widely popular, and was ideal for use on monopods, ground pods, and non-Arca style ball heads to convert them to an, Arca-Swiss style quick-release system. Our clamps were designed to be used with a wide array of plates with the Arca-Swiss geometry. However, the C-10 did not fit the ball head stem geometry of a few very popular ball heads, so the clamp needed modification in order to install it permanently on the ball stem in place of the original clamp.

The C-12 clamp is an improved version of our original C-10 standard clamp for use with ball heads. Since it has the same mechanical advantage as the larger C-30, it can handle small and large lenses alike. The C-12 clamp was designed to retrofit a wide variety of ball heads, making the conversion from a non-Arca system to the Arca system easier. Refer to our compatibility chart on our website for ball head retrofit.

The C-30 clamp would have the same issue as the discontinued C-10 clamp with respect to mounting on ball heads. We feel the C-12 has sufficient clamping strength for most of the applications our customers may encounter. Here’s a comparison guide:

FeatureC-12 clamp C-10 (discontinued)C-30 clamp
Retail PriceUS $79US $79US $100
Set screws included (anti-twist)330
Center hole typeThreadedThreadedThreaded
Center hole size3/8”-163/8”-163/8”-16
Fits ball head stem with raised bosses (anti-twist)YesNoNo
Fits 3/8-16” stud on monopod, tripod, ground or window podYesYesYes
Made for attachment to old-style Wimberley Head (model WH-100)NoNoYes
Fits ¼”-20 stud on ball head QR plate, monopod, tripod, ground or window podYes, with BS-100 bushingYes, with BS-100 bushingYes, with BS-100 bushing
Safety stop screw groovesYesYesYes
Included hardwareBS-100 brass bushing, hex key, BS-100 brass bushing, hex key, Mounting hardware for installation on WH-100 (&WH-101) lens support platform

Posted on February 4, 2015 at 3:18 pm