A:AnswerYes the manfrotto 290 will support a digital camera with a 600 mm lens, I have a Nikon d500 and I have a few lenses that way between 3 and 5 pounds my Nikon camera weighs just over 2 lb. One thing I recommend that I have that I use with my manfrotto 290 is a cradle type mounted onto the top of the tripod so when you have a substantial camera and lens it will allow you to Pivot the camera up and down in side to side which when doing animal photography it's the best way to go. I recommend on YouTube the gentleman who is on Amazing photographer and when it comes to doing any type of photography and the equipment he has videos that instruct you how to use it and he has videos that have great tips on how to do different types of photography. His name is Steve Perry. He is one of the most knowledgeable photographers out there.
A:AnswerYes absolutely it will work with almost any camera brand out there, because they all have a standard 1 quarter inch mounting thread on the bottom of the cameras end most every camera and tripod sold for the last 100 years all have the standard 1/4 in thread on the bottom of the camera and every tripod has the quarter inch screw that screws into the bottom of the camera. That's one thing the industry did and it's standard so the manfrotto tripod will work with anything.
A:AnswerYes it is compatible. It has a quick release mount and two sizes of tripod/camera screws so no matter the hole in the bottom of your camera it will fit.
A:AnswerThe Ronin 4D from DJI is "an innovative all-in-one camera/gimbal solution." The weight of the kit exceeds the specified weight limit of the 290 tripod:
10.3 lb / 4.67 kg (With Battery, Grip, Handle, Monitor, Recording Media, Viewfinder)
3.2 lb / 1.45 kg (Body Only)
2.29 lb / 1.04 kg (Gimbal)
That's about 1.8 times the given limit of the 290 tripod.
A:AnswerYou probably bought a returned item where the previous buyer took the mounting screw and kept it. Maybe they even very carefully opened the box so they could fool Best Buy into thinking they hadn't opened the box and pilfered a part.