davide sorasio

Hi everybody! I do not have experience with film cameras and I was wondering if it's possible to use a teradek and a TV Logic on the Arricam Studio. I know that it outputs a composite video signal, so I was wondering if there's a way to send an image to a director's monitor though a teradek. For the TV logic I gues it'd be enough to switch the device from sdi to composite correct?

Thank you in advance for the help!

Hi everybody! From my general understanding usually for 35mm lenses the sweet spot of the lens is usually 2 stops down from the widest aperture. I wanted to know if anamorphic lenses have the same features or where the sweet spot of the lens usually is.

Thanks in advance!

thanks! I have some more questions, so at this point what is the difference between RGB 422 and YCrCb 422?, and between RGB 444 and YCrCb 444?

And why are you saying that "If we use RGB, we must store all three channels at full resolution"?

Hi everybody, I'm reading about color sampling and I'm getting a lil confused about the difference between RGB and YCbCr. From what I've understood they are both color spaces, but YCbCr comes handy because full bandwidth RGB signals have a lot of color redundancy and they are not economically efficient for storage and transmission. One of the things I do not undestand is when in cameras happens the passage from RGB to YCbCr. For example, if I'm shooting with a high end level camera like Alexa or Epic what is the color space? And if I have a chence to choose between the two which one should I choose? And another thing, I've seen that in high end level monitors there is a hdsdi input but also different inputs for YCbCr signals, whit differents connectors for the different color components. why is that?

Thanks so much in advance for the help,

Davide

Hello everybody,

reading some manuals I see that they talk about lenses with linear focus mechanism and lenses with non-linear focus mechanism, what is the difference between them?

Thanks in advance for the help

 

if you use preston, you will have this system

 

- MDR, mounted on the camera (http://prestoncinema.com/images/photos/mdr3_2014.jpg)

it receives the signals for focus, iris, and zoom information from hand units. it also drives the FIZ motors via cables.

 

- your focus puller will do the focus control using the FIZ hand-unit (http://prestoncinema.com/images/photos/hu3_double.jpg)

you can attach a zoom controller to the FIZ HU and it will send the zoom information as well

 

- your DP, or whoever else, will do the iris control via single-channel controller (http://prestoncinema.com/images/photos/news08_05.jpg

 

set the MDR, the hand-unit, and the single-channel controller to one channel, and they will all talk to each other

 

==

 

if you use bartech,

 

- you need to have 2 MDRs for the 2 motors, and 2 hand units

- set focus MDR and focus HU to the same channel, and set iris MDR and iris HU to a separate channel (read bartech's manual, they tell you which channels work best)

 

in this picture you can see a DP using bartech system to control iris motors on 2 different cameras http://www.csc.ca/publications/2015/201509/images/ArticleImage20150902.png

 

==

 

if you want to mix-n-match...

use preston MDR for something, and attach bartech MDR for something else

Thanks a lot! one last doubt I still have after reading the Preston FIZ manual, I do not really understand what the AUX channel in the mode menu is made for. I'm attaching here the screenshot of the page manual because I really cannot figure this out!

In the next page it also tells me that :

"The second function of Custom Mode is to turn off one or more of the HU3 control

channels focus, iris, zoom or auxiliary. This is useful when using the HU3 in combination

with the Focus/Iris or Radio Microforce single channel units. Turning off the HU3 channel

will prevent the motor from changing from the setting of the single channel hand unit to

the setting of the HU3 if the signal from the single channel unit is lost.

Figure 7.4 shows the HU3 zoom channel set to Off, so if the signal from the Radio Micro

Force is lost, the motor will not revert back to the zoom setting of the HU3.

In situations where the lens setting must be controlled only by the single function hand

unit and not the HU3, the corresponding HU3 channel should be set to “Off”.

Zoom Mode"

Thanks so much in advance for the help!

What is this sliding bar used for??

thank you all! What still confuses me is, how can I delegate the iris function to a second unit? Let say I one hand unit for focus, and I want the DP to control the aperture during a shot. I need 2 different hands, but how are they in relationship with each other? Do I need only one motor driver for the preston for example? And how do I make sure each hand controls only one thing? Also I know with the PRESTON FIZ I can use two different hands (The question above still exists BTW), but if I wanted to use a bartek for example, should production rent 2 different hands, motors and receivers etc and run thme independently?

Sorry for the obvious question but I've only worked with the need for pulling focus with BARTEK and EDEN KARAT wireless follow focus.

If anybody could also give a maybe more analitical explanation of how I could make it happpen it'd be great.

Thanks so much in adavance

Hi everybody, I'm reading David Stump's digital cinematography manual and I need a couple of clarification. Is BAYER FILTER ARRAY (or any other color filter mosaic) used in both RAW or RGB signal output cameras? And does it have something to do with it or that's just a way that the sensor read the lights and it's independent from the file format? It's kind of confusing to me because I wonder if the Bayer CFA is used only when shooting raw or if it's just a system that is independent from the FILE FORMAT.

Thanks in advance for the help!

Hi everybody. I was wondering if anybody could give some advise on where I'd be good to apply for internships/entry level prep technician in NYC. I know Abel, Arri CSC, Adorama but I wanted to know if you know any other smaller/worth applying ones. Google is not being super helpful!

Thanks so much,

Davide

Hi everybody, I was wondering how people control the aperture and pull focus during a steadycam shot for example. Is it possible through only one remote? Or I'd be necessary to do so with 2 different motors and and remotes?

Thank you in advance for the help,

Davide

thanks so much! one last thing, what's the difference bewteen zooms and variable focal lenght lenses?

Hi everybody, can anybody give a little insight on what parfocal lenses are?

Thanks so much in advance,

Davide

Hello everybody, I'm reading more about camera sensor and I've read that 3chip CCD sensors have a dichroich prism system that break the light in different color wavelenght etc etc. my big question is does a Interline Transfer CCD sensor (that I've read being a 1 chip sensor) have a dichroic prism or that is true only for a CCD 3chip 2/3 inch sensor?

Thanks so much in advance for the help

sorry but I cannot make the formula work, maybe I'm wrong but after doing the math it would come to 0.5/ 1.5 that comes to 0.33, I do not see how you got to 0.16 meters at the end.

Hey everybody, I've seen that in all TV logic focus assist menu there is an option that says "focus assist level", with the possibility of dealing numbers (in % as measuring unit) that I can see change the sensitivity of the device. I was wondering how should the level be changed according to the scene brightness for example. I've realized most times the device reads everything like if it was in focus when clearly it is not and I was wondering if anybody had tips/workflow to share on how regulate and use the focus assist function in the best way to take advantage of it because most times I find it misleading more than helpful!

Thanks in advance,

Davide

Hi guys, I was wondering if any of you could share any tips on how to pull focus on hand held shots.

do you have a particular workflow? I feel confident with dolly shots but handheld sometimes still gives me some issues.

Thanks so much in advance for the help!

HI everybody, I have ask around but nobody seems to agree on how the different plates are called.

Can anybody give me an insight on base plate, duvtail, bridge plate, wedge plate etc etc?

Thanks so much

Thanks guys! I was just reading somewhere on the internet that 15 IRE equals to a stop? is that true?

Hi everybody, I'm having issues understanding how time code works and what are the ret/sync and TC I/O bnc ports on the back of some cameras like the Amira for example.

I hope somebody can give me some clarification!

Thanks in advance!

Hi everybody. I have a couple questions on the zebra features of digital cameras. I know it's a feature that helps you seeing which part of the frame correspond to a certain IRE level. What I'd like to know is which level of IRE should the zebra set to. I know it is a customizable feature but I'd like to know generally what should the zebra level set to. Which IRE value corrspond to over exposed to a point of loosing info? And why is there an option to set 2 zebras at the same time?Is it because it's common to set it for a high value of IRE and a low value at the same time in order to check over and under exposure at the same time?

Thanks so much in advance for the help!

Now that we are getting more in details, what's the relationship between bit depth and color space? if bitdepth tells me how many ow many colors can be represented what is the color space telling me?

so gamut is more related to the physical capabilities of the monitor (or device) while bit depth is more connected to the potentialities, is that correct? And if it is might it be possible that the bit rate overpass the capabilities of the dispay's gamut?

And how is gamut measured? And what is the point of shooting with a 12 bit depth if then the content might be screened on a normal tv or pc monitor? Does it have something to do with color correction?

great! one last thing, is bit depth the same thing that gamut? Because I see from Technicolor website that gamus is " the range of colors that a particular device can capture or show".

Hi everybody, I'm wondering if anybody has some advise on how an AC resume should look like. Should I put my education and formative experiences? Should I only put the filmography and only the more importants jobs or should I put students films too? Any other advise is more than welcome!

Thanks in advance!