I am currently using extension tubes with my 55mm f1.8 takumar
My depth of field is pretty shallow... It looks like poop.
I am looking at the canon 100mm. Will that be better for macro video work?
Any tips on macro video work?
You do know the depth of field does not depend on the brand or quality of the lens. It depends on the magnifications and the f-stop. The 100mm lens will give you more working distance but the same DOF as the 50mm.
But with video the resolution is less so you can in effect have more depth because the low-res 1080 line sensor if more tolerant of out of focus. But this effect is small.
For more depth you need to shoot at (about) f/16. This means you need either longer exposures or more light. With still you have the ability to use a flash. With video you will need a continuous light that allows shooting at f/16 and you do not ant to "melt" you subject. LED lighting is the way to go. Find small LED video light on Amazon for under $50. Nothing will make you look better then lighting. The make LED ring lights. But experiment with light tends too. Make one with an old milk jug.
Obviously for either still or video macro work you will need a very sturdy tripod.
Video macro is very hard if the subject is moving. You would have to follow focus, not an easy job.