What do you mean by "eng"? And I don't follow why servo zooming is so important - do you mean so they act like the inexpensive camcorders? But then we wouldn't be using our EF lenses since they are manual zoom, correct?
Electonic News Gathering. The layout of broadcast, industrial and some cinema cameras for the last 30 years.
The great thing about the ENG format is that lenses are interchangable and if you can work the essentials on a Sony or Grass Valley, you can pick up a Panasonic, or Ikegami the following day and get shooting quite quickly as the essential controls are all in the same place.
Servo zooming lets you do controlled zooms with smooth ramping.
At the moment if you shoot on a DSLR you are using a manual zoom. We are 5 years into the game now, there should have been some servo zoom lenses available before now.
Did you mean "DV"? Say around $1500?
No, I did actually mean MV, which was a series of Canon camcorder aimed at more serious home users, with a price premium, but not a 'professional' price tag. Before vimeo fans shot on T3i's they shot on MV20's.
As a professional video guy what do you think about using EF lenses? I've tried it a few times for my
home vids, it wasn't easy to set focus. DOF etc. I haven't really gotten the hang of it.
I think EF lenses are great for stills, and with some caveats, pretty good for video. Generally good contrast. Usually a lot sharper than video lenses.
The problems are:Short zoom ranges or slow apertures.
It's not going to happen but an 18-250 constant f2.8 servo zoom IS lens would be a great 'kit' lens for many video users.
Instead I have 2 zooms which kind of get close. More to carry, hassle of changing, more filters or adaptor rings to carry. No servo zoom, so effectively no live zooming.Crap lens markings
Where focus scales exist they are tiny and useless. Some of the lenses have powered focus rings, some don't have decent end stops, and at the consumer end none have decent throw to their focus rings.
A strange one this, I used to have a couple of prehistoric push pull EF zooms (the 70-210 f4 and 100-300 f5.6L) and as far as I could make out these lenses held back focus from the tele end to wider end. I don't know if the same is true of the 35-350, 28-300 or 100-400 current push pull lenses, but it certainly isn't true of my 70-200 f2.8L and wasn't true of my 17-40 f4L. These lenses were designed to be in focus for a shot at a time, usually via AF. You recompose by zooming, you refocus with a tap at the shutter. For video this isn't all that great, as you find a shot is soft if you zoom between takes.
Changing aperture sends vibrations and handling noise through an EOS camera. The aperture only changes in solid 1/3 stop steps, so if you ramp exposure you get a flickr as you do so. Also on some 'constant' aperture lenses the iris diaphragm changes very very slightly as you zoom adding to the noise.
A manual aperture ring would also be super. But perhaps unpopular with stills guys used to full aperture TTL metering.
The idea is interesting. I don't like using my DSLR for video either, if there was a $1500 C line that had the essential features I'd consider getting one for my own amateur efforts.
If the rumours are true it would be very interesting to see what they come up with. Or what they've left out.
If I could get a large sensor camera with servo zoom lenses and the option of 'i', and decent audio then I would have one camera for all my needs, and wouldn't have to carry around the huge ENG camera and even huger ENG tripod anymore. I'm getting old.