When it comes to selecting clamps designed for underwater cameras, GoPros, cinema monitors, or other equipment, the main question that we always get here at Ultralight Camera Solutions is: coarse or fine threads? For the longest time, Ultralight exclusively produced coarse-threaded clamps, a tradition that endures today, except for our AC-CSF28 clamps. The AC-CSF28 clamps were suggested by our largest dealer several years ago and have since become our best-selling clamp.

In an initial comparison between coarse and fine-threaded clamps, the primary difference lies in their knobs and the screws used for the bottom clamp half. Coarse-threaded clamps utilize a ¼”-20 Phillips pan machine screw, while finer-threaded ones use a ¼”-28 Phillips flat machine screw. The top clamp half with the through hole remains identical.

Coarse threads:

• Feature a larger pitch, resulting in fewer threads per inch, similar to the ¼”-20 machine screw.

• Are less susceptible to galling but require more threading area.

• Have fewer chances of cross-threading.

• Can endure more thread abuse before malfunctioning.

• Begin threading more easily into objects.

Fine threads:

• Have a smaller pitch, yielding more threads per inch, like the ¼”-28 machine screw.

• Are more prone to galling.

• Demand a longer threading area.

• Can sustain thread damage more easily.

• Allow for more precise adjustments.

• Are stronger than a similar bolt with coarse threads.

There are further considerations for larger bolts or machine screws, but they mostly concern manufacturers other than Ultralight.

The ultimate question remains: which is better, the fine-threaded AC-CSF28 clamp or the coarse-threaded AC-CSF clamp? Much of this decision comes down to personal preferences. While the AC-CSF28 clamp with finer threads provides greater precision when tightening the knob, does it make a significant difference? If everything is new and in perfect condition, it probably does. However, if the clamps haven't been cleaned and serviced regularly, will they still perform the same? Perhaps, or perhaps not. Personally, I admit that I don't maintain my equipment as diligently as I should, but I know others who are meticulous about maintaining their clamps for their photography and video equipment including GoPros.

For me, the choice between the two clamps isn't so much about which one is better but rather which one suits my needs best. Here's how I believe the decision between coarse and fine-threaded clamps should be approached:

Coarse-threaded versus fine-threaded:

• Consider your equipment maintenance habits.

• Evaluate whether a finer adjustment justifies the higher cost of a fine-threaded clamp.

• Explore options for customizing the knob color. Both the AC-CSF and AC-CSF28 clamps are available in black, green, blue, and red, but the coarse-threaded AC-CSF also offers knobs in purple, pink, and yellow. • Assess the importance of uniformity if you require other clamp styles, such as longer ones or those with cutouts. The AC-CSF28 is the only clamp we manufacture with a fine-threaded bolt; all our other clamps feature coarse threads for your GoPro mounting solutions.

• Confirm the availability of repair and service parts; Ultralight offers them for all clamps for your GoPro mounting solutions.

If you still have questions after considering the above points, please don't hesitate to Contact Us at Ultralight. We are always eager to assist you!

Here at Ultralight Camera Solutions, we pride ourselves in manufacturing quality underwater photography and cinematography parts, all USA made with USA materials. These products include underwater video lighting solutions, camera arms, lighting clamps and many other products. Our assembly and packaging are done in-house as well at our warehouse in Oxnard but occasionally there are some problems. 

ken kollwitz working on ultralight 1 inch ball mounts

Our customer service is extremely important to us and we are ALWAYS happy to help. Owner Ken Kollwitz has been on the other end as a customer and fully believes in the Golden Rule, "do to others what you would have them do to you". For such a simple idea it seems many companies have forgotten. Here at Ultralight, this is one of our main goals, to offer the BEST customer service possible.

This also carries forward to our warranty and Terms of Service. We believe in making products that last, no matter what type of environment they are used in and because of this, we offer a lifetime warranty on all our products. As we all know, there's always the possibility of a problem, whether it is a malfunction of a product, missing parts, or a customer issue. Whether you purchased a 1 inch ball mount for your camera or cinema lighting clamps and arms, we will work with you to ensure that you are satisfied with our products. No matter what the issue is, email us at info@ulcs.com, give us a call at (805) 485-0233, or reach out to us through our contact us page and we will be happy to help.

One important thing to remember is that Ultralight is a small company. It's not like calling a big company which can be very hard to get a hold of somebody who can help. You won't go through one of those automated phone systems that take forever and totally frustrate you. Call us and more than likely you will get Ken, the owner of Ultralight. We stand behind everything that we manufacture, and we're here to help. Also, one more very important thing is that we are ALWAYS happy to hear your feedback, good or bad because we can't make needed changes if we do not know where those changes are needed. If you are looking for professional lighting support systems or other underwater photography accessories give Ultralight Camera Solutions a call today!

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