I've spent some time the last couple of mornings and nights looking into as much as I could find about ball heads for the GT1542T that I just purchased. I made the table below to help me keep track of the different physical characteristics of the ball heads I was reviewing and the Joby, just as a reference as I own it with my gorillapod:
Ball Head Price ($-Jan 2013) "Rated" Weight (lbs) Ball Diameter Ball Surface Area Ball Head Weight Ball Head Height Base Diameter (mm) (in) (in2) (g) (lb) (mm) (in) (mm) (in) Small Ball Heads Joby BH1 $40 6.5 25 1.0 3.0 150 0.3 63 2.5 42 1.7 RRS BH-25 LR $175 8.8 25 1.0 3.0 221 0.5 66 2.6 33 1.3 Gitzo Traveler Series Ball Heads RRS BH-30 LR $275 15 30 1.2 4.4 324 0.7 75 3.0 41 1.6 Markins Q3T $310 65 38 1.5 7.0 375 0.8 89 3.5 50 2.0 Mid-sized Ball Heads Arcatech GP-s $430 25 38 1.5 7.0 400 0.9 98 3.9 53 2.1 RRS BH-40 $375 18 40 1.6 7.8 479 1.1 76 3.0 53 2.1 Markins M10 $370 100 44 1.7 9.4 490 1.1 98 3.9 62 2.4 Large Ball Heads Markins M20 $410 110 48 1.9 11.2 555 1.2 102 4.0 68 2.7 Arca-Swiss Z1 $410 122 54 2.1 14.2 680 1.5 101 4.0 -- -- Kirk BH-1 $385 50 54 2.1 14.2 850 1.9 115 4.5 74 2.9 RRS BH-55 LR $455 50 55 2.2 14.7 862 1.9 94 3.7 74 2.9
Of course, the "rated" weight is random as methodogies for determining the weight are often not known and seem to vary considerably between manufacturers. Also, base diameter doesn't include knobs and levers so it isn't representative of the total diameter of the ball head.
I found several who regarded ball size being a critical feature in terms of load bearing and stability. In fact, looking at the above table, regardless of the brand, the consensus seemed to be that people liked their ball head as long as it was 38 mm/1.5 in in diameter or greater. Which makes sense as that is about where you start seeing rapid jumps in the ball heads surface area. For example the RRS BH-30; everyone really likes (loves?) RRS, but I had trouble even finding very much online about the BH-30 and what I found was fairly evenly split between those that upgraded/thought it slipped too much and those that thought it was a great hiking/travel ball head. But as soon as you cross that 38 mm diameter line the significant majority of people liked whichever ball head they owned. Matter of fact, I only recall reading a few nit-picks (one thought the BH-40 sagged a little, another didn't like the tension in the pan control of the Markins, a few thought RRS weren't as smooth, etc). No real complaints.
Anyway, this wasn't an exhaustive evaluation, but I thought I'd share. It seems like there are several good brands out there but the secret is to get a good enough brand and a ball that is 38 mm or greater.
As I mentioned in my last post, I am focusing in mostly on the Markins Q3T or the RRS BH-40 as a combination of ball head size, general regard in what I read, and weight. There is still an off chance I'll get the BH-30 or even the BH-25 if I want to save weight and money. After all, I have taken several 30 second exposures with the Joby BH1 on a gorillapod that have come out just fine and I am sure the BH-25 and BH-30 are big improvments, especially mounted on a gitzo.
Thanks...Brant
Edit--it took me awhile to get the table in here and I lost most of my formating. Does anyone know how to get a formated table into a post? I tried uploading an image, but I seem to be limited to ~20KB, which isn't enough file size.




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