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Personally what convinced me to spend the big bucks ($15.00 for a no name lens support off of Amazon) was mounting the camera on the tripod, then the lens, then measuring the amount that the 70-200 2.8 IS II lens sags when mounted, it's about 1/4", how can that be good for the camera mount and or body? The standard answer is "Why on earth would you NOT use a lens support?" No upside to not using one and lots of potential downside.
I don't use lens support with the Arri Amira when using the 4.8 lb Canon Cinema Zooms. One thing I really like about the Amira which makes rigging it a lot quicker than rigging a C300 with cinema zooms which I always use support with.Try using that lens, then carrying your camera mounted to your tripod and carrying it on the tripod and walking, jogging over rough terrain as I often do shooting run & gun or documentary. Try hand carrying the camera and lens to your next setup and stumbling and almost dropping it. In those circumstances, for just a millisecond, you increased the weight of the 4lb lens to about 100lbs due to the g-forces (wish I had done better in physics class, I'd have the actual formula)
I have that lens and camera and have also been shooting a lot with the 100-400 4.5-5.6 IS II also which is a bit larger and heavier than the 70-200 2.8 IS II and I always use a lens support. Eric doesn't, but he's in love with his Amira now and wants his Canons to be punished ;-) Personally what convinced me to spend the big bucks ($15.00 for a no name lens support off of Amazon) was mounting the camera on the tripod, then the lens, then measuring the amount that the 70-200 2.8 IS II lens sags when mounted, it's about 1/4", how can that be good for the camera mount and or body? The standard answer is "Why on earth would you NOT use a lens support?" No upside to not using one and lots of potential downside.
Personal preference I suppose, but I typically don't like shooting interviews at f/2.8 on the 70-200; too shallow; f/4-f/5.6 for my tight and f/2-f/4 for my tight is my preference. Ideally you have a background pretty enough you don't want to turn it to mush (I filmed an interview yesterday with a cool city backdrop at f/9-f/11 at 40mm), and I like to be able to have the interviewee's ears and eyes in focus, as well as not having to worry too much about them going out of focus should they move and inch or two.I am weighing several factors in trying to decided on the right lens to use for interviews: depth of field at F/4 vs F/2.8, shooting at 800 - 1200 ISO vs 1600 - 2400 ISO, carrying and using additional support equipment or not. I have been shooting interviews with a Sigma 24-105 F4 and Canon 70-200 F/4. When I frame a head shoulder interview at 70mm -100mm, which creates a nice personal distance from the interviewer to the interviewee, I have a little to much DOF for some backgrounds. Having a 2.8 lens would give me more choices when setting up an interview. In almost any other shooting circumstance, F4 is fine. and the Canon 70-200 F4 seems fine without a lens support.
I used a lens support for years with my AF100 and a 2.8 lens, but really enjoyed how compact the C200 is without the needed rails.
Drew
I am weighing several factors in trying to decided on the right lens to use for interviews: depth of field at F/4 vs F/2.8, shooting at 800 - 1200 ISO vs 1600 - 2400 ISO, carrying and using additional support equipment or not. I have been shooting interviews with a Sigma 24-105 F4 and Canon 70-200 F/4. When I frame a head shoulder interview at 70mm -100mm, which creates a nice personal distance from the interviewer to the interviewee, I have a little to much DOF for some backgrounds. Having a 2.8 lens would give me more choices when setting up an interview. In almost any other shooting circumstance, F4 is fine. and the Canon 70-200 F4 seems fine without a lens support.
I used a lens support for years with my AF100 and a 2.8 lens, but really enjoyed how compact the C200 is without the needed rails.
Drew
And to be clear, with the 70-200 2.8 IS II, with the camera sitting there on sticks, I agree, no support needed. It's all of the transporting the camera and lens that makes me paranoid for the mount. Those of us who run all over the place with a built up camera, the support is needed for us. If you just sit in a studio or office with your camera on sticks, you don't need the support.
Does it worry you that it's only supported underneath the lens? The tripod on shoulder scenario could mean force coming from any direction?
Sounds to me like your real issue is your key light is not bright enough if you're only getting 1600 - 2400 ISO at f/4. Better to spend that $2k on lighting if that's the case I'd say.
When I used a Rifa I used a 1000w bulb, and didn't use an egg crate (which also looses light). I believe if a light is too harsh on someone's eyes you can increase the size of the source (soften it) to lessen eye strain, which then means you'd need a brighter light to fill up the whole area while still achieving the level of brightness on the subject that you desire.I typically use a Rifa with a 500w - 750 bulb and an egg crate at about 6-7 ft. from the subject as a key and Arri fresnel and Nila lights for background and accents. I find a 1000w bulb can bother people. I have lit literally hundreds of interviews with this set up but am still experimenting with settings and lens on the C200. I have been using Wide DR and shoot at 23.98P and am typically at 1600 ISO for good exposure. I like the extra head room Wide DR provides but do loose about 1/2 stop over the Normal Standard.
Drew
That's true, but the lens support I have cups around the entire bottom of lens, not just at one point so I have at least a fighting chance it would not snap the mount off. depending on which way the impact was. I wonder if anyone makes a circular lens support, like a ring? I know the lens support for the CN-E Compact Servo zoom screws into a thread at the bottom of the lens, lending support from lateral and upward impact.