An excellent set of spreadsheets that detail the many lenses used with motion picture cameras is compiled by Richard Bradbury of London, UK. He is a 1st Assistant Cameraman and Focus Puller.
The database is here: Motion Picture Lens Database
All posts by Like Tangents In The Rain
Light Levels In Cinema – From the Screen’s Viewpoint
THE IMPORTANCE OF SCREEN DESIGN IN ACHIEVING CORRECT LIGHT LEVELS IN CINEMA
A FREE WEB SEMINAR FROM HELD ON 29th FEBRUARY 2012, 15:00 GMT, (10:00 EST).
The first thought is that one wonders where they get these numbers and why are they in the inelegant and less granular Foot Lamberts (fL) instead of the primary international specification unit (SI unit) of candelas per square meter. To the first, perhaps 4.5fL (14.5 candela per square meter) is taken from the typical mastering, or ‘color timing’ level. But countless stories and interviews and presentations make the point that 3 – 3.5 fL (10.3 – 12 cd/m2) is more typical – actually the “target”, and…it must be pointed out, that this number is for the one tested point in the auditorium. High gain screens have such a disastrous roll-off that the light level if 50% less a few seats away, both horizontally and vertically. This takes the light levels from the photopic state well into the intermediate mesopic and probably into the scotopic levels as the screen continues to roll off as one goes further from the measured position.
Certainly, the Harkness seminar will go through this. Perhaps they’ll even describe how to actually tweak a room for 3D because this seems to be a mystery for even the most experienced of technicians, or how the hot spots and splotchiness of silver screens don’t violate SMPTE and DCI specifications.
Here is what they describe as what we’ll learn:
During this FREE web seminar from Harkness Screens, you will learn about:
Methods for achieving the correct brightness levels for 2D and 3D cinema
The importance of screen selection in achieving desired light levels
How screen choice can optimise operating costs
How to measure screen brightness
Historically, the DCI studios have looked the other way when a technology was being used that didn’t comply with the spec, that is, until a company was able to show that a shipping product was out there which could meet the spec. So, MPEG lived until Doremi showed a working JPEG product, then a date-certain was set. Now that SMS devices are finally getting their certification papers from DCI authorized testing labs, one suspects that a certified projector/SMS (or IMB) pair will become de rigueur.
Last week Barco and Qube showed high-frame rate 3D at the Wide Screen Event. Barco also showed their laser-based system that was able to deliver 79 candelas per square meter onto a 70 foot screen. (That’s 23fL in obscure talk.) How that would traduce into 3D isn’t known. But one guesses that there is a lot of potential to reach the real SMPTE/ISO/DCI specification of 48 candela per square meter, plus or minus 10.2 cd/m2…in other words, 58 to 38cd/m2.
There is no exemption from this number for 3D. Could there be a day, perhaps when IMAX introduces their Laser Light Engines, LLC-powered laser projectors which actually meet this spec, that SMPTE and DCI and ISO helicopters hover over cinema auditoriums with lower light levels, especially 3D?
Is it just a coincidence that 50% of 79 is very close to 38? Pass the tin foil.
Work in process…please return
Light Levels In Cinema – From the Screen’s Viewpoint
THE IMPORTANCE OF SCREEN DESIGN IN ACHIEVING CORRECT LIGHT LEVELS IN CINEMA
A FREE WEB SEMINAR FROM HELD ON 29th FEBRUARY 2012, 15:00 GMT, (10:00 EST).
The first thought is that one wonders where they get these numbers and why are they in the inelegant and less granular Foot Lamberts (fL) instead of the primary international specification unit (SI unit) of candelas per square meter. To the first, perhaps 4.5fL (14.5 candela per square meter) is taken from the typical mastering, or ‘color timing’ level. But countless stories and interviews and presentations make the point that 3 – 3.5 fL (10.3 – 12 cd/m2) is more typical – actually the “target”, and…it must be pointed out, that this number is for the one tested point in the auditorium. High gain screens have such a disastrous roll-off that the light level if 50% less a few seats away, both horizontally and vertically. This takes the light levels from the photopic state well into the intermediate mesopic and probably into the scotopic levels as the screen continues to roll off as one goes further from the measured position.
Certainly, the Harkness seminar will go through this. Perhaps they’ll even describe how to actually tweak a room for 3D because this seems to be a mystery for even the most experienced of technicians, or how the hot spots and splotchiness of silver screens don’t violate SMPTE and DCI specifications.
Here is what they describe as what we’ll learn:
During this FREE web seminar from Harkness Screens, you will learn about:
Methods for achieving the correct brightness levels for 2D and 3D cinema
The importance of screen selection in achieving desired light levels
How screen choice can optimise operating costs
How to measure screen brightness
Historically, the DCI studios have looked the other way when a technology was being used that didn’t comply with the spec, that is, until a company was able to show that a shipping product was out there which could meet the spec. So, MPEG lived until Doremi showed a working JPEG product, then a date-certain was set. Now that SMS devices are finally getting their certification papers from DCI authorized testing labs, one suspects that a certified projector/SMS (or IMB) pair will become de rigueur.
Last week Barco and Qube showed high-frame rate 3D at the Wide Screen Event. Barco also showed their laser-based system that was able to deliver 79 candelas per square meter onto a 70 foot screen. (That’s 23fL in obscure talk.) How that would traduce into 3D isn’t known. But one guesses that there is a lot of potential to reach the real SMPTE/ISO/DCI specification of 48 candela per square meter, plus or minus 10.2 cd/m2…in other words, 58 to 38cd/m2.
There is no exemption from this number for 3D. Could there be a day, perhaps when IMAX introduces their Laser Light Engines, LLC-powered laser projectors which actually meet this spec, that SMPTE and DCI and ISO helicopters hover over cinema auditoriums with lower light levels, especially 3D?
Is it just a coincidence that 50% of 79 is very close to 38? Pass the tin foil.
Work in process…please return
Faster FFT @ MIT
Your milage may have the variance of introduced Gaussian noise.
No other comment except to point out that the papers were presented at the Society for Industrial and Applied Mathematics [SIAM: ACM-SIAM Symposium on Discrete Algorithms (SODA12)] along with dozens of other papers, including:
- A Little Advice Can Be Very Helpful Arkadev Chattopadhyay, Jeff Edmonds, Faith Ellen and Toniann Pitassi
- Popularity vs Maximum cardinality in the stable marriage setting Telikepalli Kavitha
- Race to Idle: New Algorithms for Speed Scaling with a Sleep State Susanne Albers and Antonios Antoniadis
Joking aside, there were many interesting sounding papers:
Faster FFT @ MIT
Your milage may have the variance of introduced Gaussian noise.
No other comment except to point out that the papers were presented at the Society for Industrial and Applied Mathematics [SIAM: ACM-SIAM Symposium on Discrete Algorithms (SODA12)] along with dozens of other papers, including:
- A Little Advice Can Be Very Helpful Arkadev Chattopadhyay, Jeff Edmonds, Faith Ellen and Toniann Pitassi
- Popularity vs Maximum cardinality in the stable marriage setting Telikepalli Kavitha
- Race to Idle: New Algorithms for Speed Scaling with a Sleep State Susanne Albers and Antonios Antoniadis
Joking aside, there were many interesting sounding papers:
Cloud Industry Forum Deals in Self-Certification
Self-Certification is a great concept, especially when it is modeled upon the premises described in ISO 9001.
They have an interesting model at: Cloud Industry Forum – Self Certification – Self-Certification Process
Cloud Industry Forum Deals in Self-Certification
Self-Certification is a great concept, especially when it is modeled upon the premises described in ISO 9001.
They have an interesting model at: Cloud Industry Forum – Self Certification – Self-Certification Process
Phishing Your Employees 101
The Simple Phishing Toolkit includes a site scraper that can clone any Web page — such as a corporate Intranet or Webmail login page — with a single click, and ships with an easy-to-use phishing lure creator.
Read it all at: Phishing Your Employees 101 — Krebs on SecurityPhishing Your Employees 101
The Simple Phishing Toolkit includes a site scraper that can clone any Web page — such as a corporate Intranet or Webmail login page — with a single click, and ships with an easy-to-use phishing lure creator.
Read it all at: Phishing Your Employees 101 — Krebs on SecurityThe Daze of CES 2012
A nice, clean review of interesting products shown at CES 2012 Photo Review and Comments from Digdia, a Digital Media Market Research and Strategic Consulting group out of Cupertino.
The Daze of CES 2012
A nice, clean review of interesting products shown at CES 2012 Photo Review and Comments from Digdia, a Digital Media Market Research and Strategic Consulting group out of Cupertino.
[Updated] Doctorow: The Coming War on General Purpose Computation
From the UK, this discussion has gone from theory to practical. A member of the House of Lords has discussed the “licensing” of blogs…calling them, “The Wild Wild West” because bloggers have been known to be stealing cows and shooting pedestrians in the towns and rugged valleys of the internet.
Jon Slattery: How Lord Hunt wants to tame bloggers and online
The PCC wants to regulate blogs, and make us pay for it | Liberal Conspiracy
[Updated] Doctorow: The Coming War on General Purpose Computation
From the UK, this discussion has gone from theory to practical. A member of the House of Lords has discussed the “licensing” of blogs…calling them, “The Wild Wild West” because bloggers have been known to be stealing cows and shooting pedestrians in the towns and rugged valleys of the internet.
Jon Slattery: How Lord Hunt wants to tame bloggers and online
The PCC wants to regulate blogs, and make us pay for it | Liberal Conspiracy
Distraction–12 Misunderstood and Misquoted Shakespearean Expressions
A few minutes of fun, which you can never use since everyone else will have it wrong and think you nuts.
Distraction–12 Misunderstood and Misquoted Shakespearean Expressions
A few minutes of fun, which you can never use since everyone else will have it wrong and think you nuts.