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Question: Forgive me if a dumb question!  But is this fully compatible with the Manfrotto 680B Monopod?
Document: Nice, inexpensive ball head that compliments my Gitzo Carbon Fiber Traveler Monopod perfectly. Uses the same quick release plates as my Manfrotto/Bogen pistol grip ball head that I use on my tripod, so the camera mount is compatible with both.
This is my first "Expensive" tripod/monopod setup. I own the Manfrotto 055XPROB tripod and the Manfrotto 680B Monopod. I use this ball head on both and it is very flexible in terms of the wide array of angles/movements you can have when using this ball head. At first it is a little weird and takes some getting used to. In the first few minutes I felt like tossing it in the box and returning it, but I gave it a few hours and went out experimenting with it.
Small package and perfect for your carbon fiber tripod or mono-pod. the quick release plate is compatible with the Manfrotto line and makes it easy to move between their product lines.Not much to dislike, it's a great ball head.
The tiny little lever actually hurts my finger! My other Manfrotto heads merely need a gentle twist and click into a notch in the lock position.I compared the 494 to the nearly twice as expensiveSUNWAYFOTO FB-28 Mini Tripod Ball Head Arca Compatible 7 oz Sunway FB28, a ball head of similar size and weight. For an extra $50 the FB-28 had smoother ball movement and was more refined in fit and finish.
I bought this to use with my Manfrotto Super Clamp. By putting the head on the clamp, I can attach a camera almost anywhere I want for taking steady shots, even at night, without a tripod. I also mount this head to a tripod leg using the Super Clamp, so I can attach two cameras to one tripod. This head is just the right size for using with the Super Clamp. The action seems pretty smooth and quick release plate is compatible with my other Manfrotto heads.
Bought this to provide a little more flexibility to my shooting on a new Manfrotto Monopod that I bought at the same time. Attached easily and works great! Using it with a D800 and also with a cell phone attachment for a new iPhone 5s.
I have the RC496 that I use on the Manfrotto 190CX3 tripod, the RC494 I use on a monopod and the 492 for a general utility ballhead for off camera flash etc. and I love them. They are all well made, excellent products. They lock securely are easy to use and make my photography more enjoyable.
This is a solidly built product. The only problem I found was that the screw hole on the bottom was too large for my monopod (it is not a standard tripod socket female size). I didn't find out until I sent it back that there are adapter screws that you can get to bridge the gap. At this price, however, Manfrotto should have included this with the ball head.
This is a Made in China Manfrotto. But compare with the 496RC2 I purchased a week ago (you can see my review in Amazon), the size is smaller but finish quality is better. The 494RC2 is rated 8.8 lbs. One good thing is the base circular plate flush nicely (same diameter) as the top plate of my tripod and monopod.
I have installed this head on my Manfrotto 676B monopod with great results. The head looks like it was made just for the monopod. A small amount of dry-slide type lube and the ball rotates smoothly. Although light weight, this head holds my prosumer cameras with ease, even with I carry them on the end of the 'pod', over my shoulder.
Answer: It worked fine on my Manfrotto Tripod and the screw-on fitting should be the same size (quarter inch?)