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#1 |
Major Player
Join Date: Oct 2004
Location: NYC
Posts: 260
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Dynamic range - stills vs video.
Is there a difference in dynamic range between HDV and DV, or between different manufacturers and models?
Do DSLRs have significantly better dynamic range than HDV/DV? Is there any difference in dynamic range between taking shots in photo mode on the H1 vs screeb grabs from video Thanks |
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#2 |
Starway Pictures
Join Date: Jul 2005
Location: Studio City
Posts: 581
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Dynamic range really depends on the bit depth of the rendered image. Whether it be 8-bit or 10-bit.
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#3 |
Major Player
Join Date: Oct 2004
Location: NYC
Posts: 260
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Robert, bit depth is the number of stairs in the staircase, dynamic range (latitude) is the height of the staircase. A 10 bit image may have less dynamic range than an 8 bit image.
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#4 |
Trustee
Join Date: Sep 2005
Location: Gilbert, AZ
Posts: 1,896
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Last time I checked, more bits means more dynamic range.
Having said that, dynamic range is a composite of of the entire signal path. So it could be possible to have a greater dynamic range with 8 bit over 10 bit. |
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#5 |
Major Player
Join Date: Apr 2005
Posts: 230
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so, what type of measurment is used to mesure the dynamic range? And has anyone done comparison of H1/HVX200/JVC/Cinealta/Viper in this aspect? How well does H1 compare to other ones, and more importantly to bigger cameras like cinealta. I have seen all the comparisons of resolution, but nobody ever mentioned this.
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#6 |
Trustee
Join Date: May 2003
Location: Atlanta GA
Posts: 1,427
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Levan I'll try to do a dynamic range test tomorrow. If I recall the way to do it is to open up the lens on a chart so that you can see 105% then close down a stop at a time until you're completely black. (monitoring of course on a waveform monitor) Seems like that might be wrong for some reason though.
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I have a dream that one day canon will release a 35mm ef to xl adapter and I'll have iris control and a 35mm dof of all my ef lenses, and it will be awesome... Last edited by Nick Hiltgen; April 6th, 2006 at 12:40 PM. |
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#7 | |
Barry Wan Kenobi
Join Date: Jul 2003
Location: North Carolina
Posts: 3,863
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Quote:
However, you can probably rely on the shutter speed, so if you want to sequentially double the shutter speed that may be more reliable than changing the iris. |
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#8 |
Regular Crew
Join Date: Mar 2005
Location: Helsinki, Finland
Posts: 51
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Pekka |
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#9 |
Trustee
Join Date: May 2003
Location: Atlanta GA
Posts: 1,427
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thanks for the heads up, Pekka, I'm afraid I'm not really sure how to make any sense of the results though, I think maybe changing the shutter speed as Barry suggested might be the best option. But I really have never done a dynamic range test (I know, what kinda nerd am I if I haven't even done that!) so if someone wants to walk a step by step through for me, that would be awesome, or I'll just look on the internet for suggestions.
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I have a dream that one day canon will release a 35mm ef to xl adapter and I'll have iris control and a 35mm dof of all my ef lenses, and it will be awesome... |
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#10 |
Regular Crew
Join Date: Mar 2005
Location: Helsinki, Finland
Posts: 51
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Nick,
I guess I just wanted to save your time. The Canon XL-H1 dynamic range test is there. As far as I can understand the dynamic range is very much the same as digital latitude. The main tests were done with Viper,Sony F950 and... But there is a test that is done similarly with Canon XL-H1, it is named Canon HDV. It is done by an other person in other conditions but I believe it is very precise. I think that this testing method is very simple and reasonable. The results just made me very happy as a Canon XL-H1 owner because I cannot have the viper... Please correct me if I am misunderstanding something. Anyway. I believe that this weekends Texas happening will bring new light to these issues aswell. Btw, the information you've given here at DVinfo has been very valuable for me. Thanks. Ps. It really seems that the T stops are not very accurate with very large or small apertures. Atleast the cameras own exposure meter gives me such readings.
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Pekka |
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