Can other magic arms with 1/4"-20 threads be mounted to this clamp?

The 'main way' of mounting to this (as I've seen) is by way of "magic arm" which uses the large manfrotto stud which would go into a hole on the bottom of this clamp, and not shown in the 2 photos provided for you here. So the ends of that magic arm are inserted into the bottom, tightened, and used to apply this clamp/arm assembly to whatever. Keeping in mind that I can only speak for Manfrotto arms, as I don't own any 'knock-offs' in which to gauge a better response to you. If I've not answered you in a way that helps, please re-phrase your question so that I can better help you out.(there is a 1/4 - 20 hole on the bottom of this clamp also suitable for that size MALE screw-in)

does it come with a wedge and can i mount a camera directly to the stud?

I'm not sure what you mean by a "wedge". But the camera will mount directly to the stud. I found it easier to mount the stud to the camera first and then to the clamp.

What products would I need to mount my DSLR upside down from a bar for an aerial shot?

I would use a Manfrotto 035RL Super Clamp + Manfrotto 208HEX 3/8-Inch Camera Mounting Platform Adapter + Manfrotto 496RC2 Ball Head (or any other head).

ASIN	B0018LQVIA
Batteries	1 Nonstandard Battery batteries required.
Best Sellers Rank	#12 in Photographic Lighting Mounting Hardware
Customer Reviews	4.6 4.6 out of 5 stars (1,138)
Date First Available	June 17, 2003
Is Discontinued By Manufacturer	No
Item Weight	14.1 ounces
Item model number	035RL
Manufacturer	Manfrotto
Product Dimensions	5.5 x 3.5 x 2 inches

035RL Super Clamp with Standard Stud

Details

Description

Specifications

Common Questions