Fri Mar 09, 2018 6:42 pm
The differences between EF still camera lenses and B4 lenses is night and day. Still camera zooms do not hold their focus when changing (zooming) focal lengths, so need to be refocused after each zoom change.
B4 Broadcast Zoom lenses are parfocal, and hold the focus when zoomed, so you can zoom in get a good focus and when you pull back, the image is still in focus.
Still camera zoom ranges are very limited, are slow f/stop wise and are not designed for video work. The new Canon Servo Video Zooms are parfocal, but have a limited zoom res ge and cost $6-12K.
A B4 Zoom is 10 to 12x Zoom range, has a nice reach on the long end, and is designed for live event videography, zooms are Servo controlled (only found on $10k plus cine zoom lenses), and used HD B4 zooms can be had for $3-6K. Once you use a B4 camera with a good Servo Zoom lens for live events, you will not want to use anything else.
The HD B4 zooms and the Ursa Broadcast camera will give excellent results in HD/1080p and can be used later for 4K streaming /recording, especially if you get the better Fujinon B4 HD zooms, XA/HA types.
The bottom line, is B4 lenses are the right tool for when you need long reach camera coverage, and are changing from wide to closeup shots quickly.
Cheers
Last edited by
Denny Smith on Sat Mar 10, 2018 5:26 pm, edited 1 time in total.
Denny Smith
SHA Productions