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JVC GY-HD Series Camera Systems
GY-HD 100 & 200 series ProHD HDV camcorders & decks.


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Old June 10th, 2009, 11:15 PM   #16
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Quote:
Originally Posted by Alex Humphrey View Post
Well it's because someone at JVC really cared about making the best product for the situation. No question about that. What is REALLY happening is that the adapter is capturing all the light meant for a larger 16mm frame size and refocusing it on a smaller 1/3 chip on the JVC, so unlike other adapters (MTF for example) where there are no lenses inside the adapter, much of the light spills on and around the front of the CCD prism and front of the camera (after the lens and before the prism and CCD block) losing 2 or more stops)
Some excellent explanations there, Tim and Alex.

Just a slight correction, if I may.
With MTF type adaptors, technically and practically there is no light loss.
Yes, not all of the light from the lens is being used, but intensity, nonetheless, remains the same.

The JVC adaptor increases this intensity, DOF adaptors will lose some via the ground glass, whereas our Nikon to 1/3" adaptors do neither.
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Old June 11th, 2009, 08:01 AM   #17
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I have some remarks, regarding to the HZ-CA13U adapter;

1. Some lenses require constant white shading (for every F-stop, a different white shading level). This was the case with the Canon S16 8-64mm I have used. You could use some specified scene files for this.

2. You would need some kind of handgrips, attached to 15mm rods, to be able to handle the front weight of larger lenses (like the Canon I've mentioned) in a good way. I use a set of Cavision, which is not the best you can get, but they'll do the job.

3. Don't expect miracles from the reduced Depth-of-Field at 16mm lenses. It's by far not as dramatic as you would have with 35mm adapters.
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Old June 11th, 2009, 01:50 PM   #18
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Quote:
Originally Posted by Alex Pitstra View Post
2. You would need some kind of handgrips, attached to 15mm rods, to be able to handle the front weight of larger lenses (like the Canon I've mentioned) in a good way. I use a set of Cavision, which is not the best you can get, but they'll do the job.

3. Don't expect miracles from the reduced Depth-of-Field at 16mm lenses. It's by far not as dramatic as you would have with 35mm adapters.
In addition:

2. As well, you will need to use the top or side record start button as the one on the zoom lens will obviously no longer exist.

3. The DOF will be VERY similar to that of 2/3" cameras (same size imager as 16mm).
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