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Hi, We are two technicians working in the film industry in France (a grip guy and a gaffer) and we just discovered this very interesting forum. We particularly noticed that gaffers and cinematographers were asking questions about light output and what aperture is obtained at a certain distance. It happens that with the help of two IT engineers we developed an iOS app responding to this question about 2 years ago. First and for all, we’re not going to post messages everywhere on this forum to sell our app nor are we going to pollute your threads to gain in visibility. We just think some of you might be interested in what we created and since we’re a really small team working on off-time we can’t do any real advertising, so you probably wouldn’t know our app existed. Our app is called Predilux (for pre-diction and lux for light) and predicts the exposure as measured by a light meter, by choosing a light source and a distance. Or inversely predicts the distance to the light source by specifying the exposure. Predilux takes into account: Camera settings (FPS, ISO, Shutter angle) Source settings (Focalisation, Lenses, Grids, Dimmer, CCT, etc) Gels mounted on or close to the source (All ROSCO e-colour+ range) All results have been experimentally verified by us with a light meter in rental houses. For each source setting we made several measurements at different distances and this took a lot of time. So Predilux does not rely on constructor’s data, but on real data reflecting the state of the equipment as found in rental houses. Our data sometimes differs from the constructor’s data. Here is a quasi exhaustive list of the sources measured and included in the Predilux (12/2019) : Tungsten ARRI 150, 300 Plus, 1K Plus, 5K Fresnel, T10, T12, Rubylight (MFL lamps) Briese 77, 100, 140, 180 with lampes ranging from 650 W to 2K Mole Richardson Softlite 1K, MaxiBrut 16 (MFL lamps) Openfaces such as Redhead, Blonde, Desisti Renoir 5kW and LTM Cyclight 2K ETC Source 4, Dedolight, Zaplight, CMC 20K, etc. HMI ARRI AS 575, 1200, 4K, 6K, 12K, Arri M18, M40, M90, ArriMAX 12K & 18K K5600 JokerBug 200, 400, 800, Alpha 1600, 4K, 9K, 18K AFM 575, 1200, LTM Cinepar 2.5K Fluorescent KinoFlo 2ft, 4ft & 6ft LED ARRI S30, S60, S120, S360 KinoFlo Celeb 200, 250, 400, 450, 850 DMG SL1, SL1 mini, SL1 Switch, MaxiSwitch Mole Richardson Tweenie, Senior, Tener Aladdin Biflex 1x1, 1x2, Flexlite 1x4, 350 Dedolight bi90, Cineroid LMD400, Velvet V1 Balloon Airstar Gaffair 1200, Elipse 4000, PAD 9ft x 9ft, Tube 16K If any of the administrators of this forum wish to try out our app, we would be happy to give them one or several free life-time activation codes. For all the other users, our app is available on the Apple Store (). An Android release is planned. If you have questions or requests, don’t hesitate to contact us at this address predilux@wid.la Thanks for reading this post and we hope you thought it was interesting, Georges Harnack for the Predilux Team

Hi everyone! I currently live in Milan and I'm working on a project that involves a huge green screen. We need to convert a room of 26x13 ft. into a green screen studio. I was doing some research online, looking for paintings to use, and I found two main brands of green screen paintings: ROSCO (US) and HATO (Germany). There is a very big difference of prizing between them and I was wondering if you could help me understand why? For example, in amazon.it you can find one gallon of ROSCO for 320EUR (. The gallon of HATO paintings costs around 92EUR. I don't know if this is because HATO is made in Germany and is near Italy so it costs less? Do you know any about quality differences between this two types of paintings? Do you recommend something specific? Maybe another brand that I didn't find on my research? If you have any advices on how to paint the room in order to make it work perfectly I would really appreciate it! Thanks!!

I was wondering how is it that these gels came to be? When did Rosco decide to ask Storaro to create them? And why did Storaro choose precisely these ten colours? How much has Storaro himself used the gels? Are there any particular instances of striking use of one or several of these gels? https://www.rosco.com/filters/cinegel.cfm?CategoryID=5

I'm gaffering on a short film this week, and had a basic selection of gels to chose from for the shoot from our university. I've got the standard CTB/CTO gels to use on our lights. I was looking for some CTS (Straw) to use on tungsten units as morning sunlight, however for some reason all I could get was No Colour Straw (Rosco #804). It seems to still produce a nice light with a slight yellow tint, which suits a morning sunrise. I was wondering what the different between normal Straw gel, and No Colour Straw gel is? I bet it's so minimal, but it would be good to know!

Hi folks! I don't know If I'm in the right forum for this, but I need some help to find a specific sort of lighting filter. I'm looking for a filter that diffuses the light but doesn't add that white color, more like a "clear translucent" / "non-white" frost / diffusion film. Rosco has got a lot of different filters, for example: E-Colour #216: White Diffusion E-Colour #220: White Frost E-Colour #480: Full Atlantic Frost E-Colour #253: Hanover Frost E-Colour #129: Heavy Frost etc. I've made two comparison pics in ps so it would be easier to explain, notice how the second example diffuses equally as much but doesn't add the white color to it. For example (#1), this is a white frost film: ...a this example (#2) is a "non-white" frost film: I don't know if such a diffusion film exist, but if you happen to know any please let me know, I would really appreciate it! Best regards /Patrik