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About videofilm

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  • Birthday 06/08/1946

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  • Location
    Upstate New York
  • Interests
    Nature, Wildlife Biology, Conservation, Photography, Videography

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  1. The image circle of a pro broadcast lens (even those monster lenses you see at football games is only 2/3 of an inch (17mm). That is all the sensor real estate that is needed for very clear ultra high definition video. I shoot HD video with cameras like that almost every week and it goes on giant screen Monitors in the hockey arena as well as out to cable TV. The slightly speckled surface you see in the adapter picture is just the surface that the lens mount is locked to by a clamping ring. The inside of the mount is flat black. The upside of a small sensor size is that you can get tremendous magnification from a manageable size lens.
  2. Distance to sensor is not a problem. Goes together perfectly. B4 lenses (The broadcast standard mount were designed for using three sensors for red, blue, and green colors mounted behind a set of prisms that separated the light into three beams filtered for the primary colors. The imagers were originally electron tubes wirh phosphors that were scanned by electron beams. These were either plumbicon or saticon tubes. The cameras were quite large and power hungry to power the high voltage electronics. The tubes were later replaced by CCD imagers. Due to the prisms, the imager is set pretty far back from the mount allowing adaptation to some mirrorless Still Camera lenses. Sensor technology has evolved such that prism separation for colors is no longer necessary and sensors can achieve HD video on tiny chips as evidenced by GoPro Cameras
  3. I found a lens mount adaptor that allows me to mount my Pro Broadcast Video Power Zoom Lenses on my Sony A7II Camera. I realize there is a problem with this adaptation as even in sensor crop mode these lenses cannot cover the camera's sensor. As a pro Video Person, I would love to have a Sony A7 tupe camera with a 2/3 inch sensor appropriate to my video lenses. Anyone who watches pro sports on TV has been watching the quality of imagery that can be captured with these small sensors that can Zoom from an image of a whole stadium to a close-up of the expression on the quarterback's face. This would make a great wildlife videographer's kit. There is no need for a giant video camera anymore to achieve great closeup imagery. All you need is a Sony Alpha 7 series camera with a 2/3 inch sensor and a small battery box to power the Zoom lens and maybe even enable the auto aperture capability of the lens. There is another way to achieve this desired result. With the increasing density of sensor chips I can visualize a Sony with greater than APS crop factor and clear image zoom that could get the job done
  4. I am now shooting with both a Canon 5Diii and a Sony A7ii. Love them both for different situations. As a video person, who does professional shooting for Pro league Lacross and Hockey I am spoiled by the reach and flexibility I have with the 20x zoom lense with a 2x extender on the professional broadcast camera I use. I would like to see some of theat capability on my Sony A7ii camera and I do believe it would be possible. I found an adaptor that allows me to mount my Video zoom lens on my Sony A7ii, but of course even in the crop mode it does not cover the sensor., In this day of increasing sensor density I believe it would be possible to create a Sony A7 model with a 2/3 inch sensor that would be compatible with my pro video lenses. This would make a great compact video kit for wildlife videography that would not break my back getting into the field. I use GoPro cameras so I know it would not be hard to find a sensor that could be fit to a Sony A7 body. As there are already good Sony to B4 lens adaptors available all that would be needed would be the mounting of the smaller sensor. This could be further enhanced by adding an interface for the auto aperture and power zoom capability of the video lense. This would require a small battery and interface boxc. Sony, Are you listening?
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