| Moderated by: chrisbet, | Page:   1 2 3 |
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| Samsung S24 - Page 3 | |
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| Posted: Wed Feb 28th, 2024 09:24 |
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21st Post |
chrisbet
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Lol on the name  The issue for the Sony FS5 is the base ISO which is 3200 when shooting Slog2/3 - the (electronic) ND filter reduces the sensor sensitivity to reduce the signal. The lenses stop down to f22 (or T22) so that is not a problem, but it increases DOF, so we use a bigger apperture to control DOF and adjust exposure using the ND filter - the FS5 was the first cine camera to provide infinitely variable ND between 1/4 and 1/128 as well as having 3 user presets.
____________________ If it is broken it was probably me .... |
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| Posted: Wed Feb 28th, 2024 17:30 |
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22nd Post |
Eric
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chrisbet wrote:Lol on the name Interesting …I hadn’t experienced burnout on any videos in the past but have done very little. So I was a bit surprised that the article I read said it was a issue (something to due with the relatively slow shutter speed compared to a still camera range) but maybe I got the wrong end of the stick? 
____________________ Eric |
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| Posted: Wed Feb 28th, 2024 18:10 |
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23rd Post |
chrisbet
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On the Sony FS5 you can select shutter speeds of 1/6 to 1/10,000 so faster than a D850 but not as fast as a Z8/9. If I understand the DOF correctly it is aperture and focal length that determine it for a given distance, i.e. F number - even with still cameras if you want to control DOF for a given f number you would use filters to reduce the light. That brings me on to another interesting thing - cine lenses have T numbers, not F numbers, the T number being the light transmission of the lens - 2 lenses of say f2 may actually pass different amounts of light to the sensor and have different T numbers - one might be T 2.1 and the other T 2.2, I wonder why the stills world doesn't use T numbers, maybe the manufacturers would not want us comparing the quality of their competitor's lensses?
____________________ If it is broken it was probably me .... |
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| Posted: Wed Feb 28th, 2024 20:11 |
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24th Post |
Eric
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I was perhaps getting my reasoning slewed. It was my understanding that videos were shot in either 24 fps or 30 fps for normal viewing speed. To achieve the ‘perceived realistic’ motion, the shutter speed should be the inverse of 2x frame rate. ie. shutter speeds of 1/48sec or 1/60sec respectively. I am unclear why a video camera needs 1/10000 sec as it would need a 5000fps frame rate, unless high speed motion? At the more normal slow shutter speeds in bright light without small aperture control the film could blow out. However, if small apertures don’t give the desired dof…then the only alternative is to reduce the incoming light with a ND filter to pair with the shutter speed.
____________________ Eric |
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| Posted: Wed Feb 28th, 2024 20:55 |
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25th Post |
chrisbet
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The higher shutter speeds make the moving objects crisper - less motion blur - the reason for the shutter = 2 x fps is that that is what the old film cameras ran at and what audiences are used to in the cinema - a certain amount of blur. Faster shutter speeds make everything crisper and can be used to impart a sense of urgency or drama to the film. Shooting at higher fps produces slow motion when played back at 25 fps - my sony records at up to 800 fps for super slow so shutter would be 1/1600 for normal blur - if you could actually detect it 
____________________ If it is broken it was probably me .... |
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| Posted: Wed Feb 28th, 2024 21:59 |
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26th Post |
Eric
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chrisbet wrote:The higher shutter speeds make the moving objects crisper - less motion blur - the reason for the shutter = 2 x fps is that that is what the old film cameras ran at and what audiences are used to in the cinema - a certain amount of blur. Faster shutter speeds make everything crisper and can be used to impart a sense of urgency or drama to the film. I will have to try this…I am in need of a new sense of urgency. 
____________________ Eric |
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| Posted: Thu Feb 29th, 2024 06:42 |
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27th Post |
chrisbet
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Like my server, I need a new power supply unit ...
____________________ If it is broken it was probably me .... |
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