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Found 9 results

  1. Hi, I am posting here for the first time, so little bit nervous. The topic might not be properly linked to aesthetics or techniques of Cinematography . Kindly let me know if this is not suitable subject (or has been discussed before). I was trying to dive into the term ‘ISO Invariance’ and I came across some videos and articles (linked below) which confused me even more. My understanding(might be incorrect) is that the voltage at pixel level ,when the photosite gets exposed to light, is very low and the Analog value is amplified by some factors then sent to the ADC,followed by De-Bay
  2. Hey, I was reading through Kodak's 'The Essential Reference Guide for Filmmakers' and came across the following: A word about film speeds You probably know that motion picture films use exposure index (EI) to indicate speed. Although similar, EI is not the same as the ASA or ISO speed used for still films. EI denotes a somewhat conservative figure related to the higher quality requirements of motion picture film that must be projected onto a large screen. Typically the EI speed is about one stop lower than ASA or ISO. EI 500 film, therefore, is the equivalent of ASA/ISO 1000. Is a
  3. Hello everyone, As I consider buying my first light meter and delve deeper into the world of cinematography, there are a few questions I can't seem to find (satisfying) answers for, at least online. I'd really appreciate any help in these matters. Question 1 Why is it so important to define a camera's true native ISO. Not the marketed one but the actual real one. I've learned how to do it it but I still don't understand why I'd do it. As an example (hypothetical), let's say I'm using an Alexa and I come to the conclusion that its real ISO is 400 instead of the proclaimed 800. What
  4. I was reading the Oscillating the ISO on Alexa thread yesterday and in it David says so I was wondering is there an easy way do to a calculation of this sort on the spot without any aid from a gadget or an exposure calculator: What is the difference in exposure between ƒ/4.5, 24 fps, ISO 640 and ƒ/2.8, 60 fps, ISO 800?
  5. Hi guys! After some research, I made a little chart one every rich man's favorite camera, the Alexa, which digs into how it really works. So I thought I might as well share it. The content holds true for every Alexa I believe, since they all have pretty much the same sensors and algorithms (even the Alexa 65 I assume, who consists of three Alexa sensors merged). On the right of the table are the only available curves to my knowledge, the LogC ones. Every other curves isn't, but should be available, so here they are. Where did I find this stuff ? A combination of gathering bits o
  6. I've been researching the native ISO of RED cameras (primarily the Dragon and MX). What's been confusing isn't the notion of a native ISO, but rather that in the debate between 320 and 800, people are referring to shooting at ISO 800 as underexposing when compared to ISO 320. From one such individual: "At 320 (which may be closer to the sensors "native" sensitivity- or the point where the raw matches the redcolor as far as middle grey) you have much less range in the highlights. By rating 800, you are underexposing the sensor a bit and protecting the highlights." Bear with me as I'
  7. I just watched this video and tought about the story on Kubrick and the candlelit scenes on "Barry Lyndon". What would he be doing with today's cameras and lenses? Of course cinematographers aren't using f0.7 lenses on day to day basis but, for example, Master Primes and Cooke 5 are pretty bright and camera ISO technology are advancing everyday. With a camera capable of a base ISO 5000 and a Master Prime on T1.3 candlelit scenes would be just the start on the cinematography crative process. What do you think?
  8. I recently purchased a reloadable super-8 cartridge from Wittner and I'm extremely confused about where to cut the ASA notch. I bought the CHROME 200D film which is Daylight: 200 and Tungsten: 50. Please could someone tell me where to cut the notches for this stock? Or somewhere said something about not needing notches for daylight film? Im very confused. I have been trying to use this guide: http://peaceman.de.www127.your-server.de/schmalfilm/super8/S8_Notch_Tools_v1.0.pdf But I'm struggling. Please could someone tell which notch to cut to on this guide? Thank you!
  9. Hi. I shooting a little narrative film on the Arri Alexa camera. We don´t have the time to shoot a test before we start shooting and I watched some test online about how high you can go with the ISO in the camera in low light locations. Do anyone in here have good experience with the Alexa camera? And how high can I put the cameras ISO with out seeing to much noise in the blacks? Thanks, Henrik www.henrikameyer.com
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