low budget monitor,

[Eric Fletcher S.O.C.]

Eric,

 

You're right and thank you. The "amplified" blue cones are located outside of the fovea, closest to the rods, and they help gather light for our night vision, sensitive motion detection, and peripheral viewing. While visual acuity is better with the cones in the fovea, the rods are better motion sensors. Since the rods predominate in the peripheral vision, and are more light sensitive, you see dimmer objects in your peripheral vision.

 

If you notice a dim star in your peripheral vision, it may disappear when you look at it directly since you are moving the image onto the cone-packed fovea area, which is not as light sensitive. But, your day-adapted cones adapt much more quickly to changing light levels than your night-adapted rods, despite their lack of light sensitivity. As you read this, your eyes move continually to keep the light from the object of interest (like, these words), falling on the fovea centralis where the bulk of the cones reside. And, so you can read the next line as well.

 

Excellent info there David, don't forget that also we have a physiological blind spot in our eyes where the nerve bundle gathers and exits the eye. It's unnoticeable during the day but at night it can become a problem due to the sensitivity difference of the rods and cones.

[David George Ellis]

We could go into color perception, response curves, the 22 degree halo, other atmospheric optics and chromaticity, etc. ad nauseum. Even the green flash at sunset, Fresnel diffraction, or anything dealing with optics, but I feel that would be more of a Cinematography Forum item. It would be like calculating C.G. based upon the weight of camera, batteries, monitor and their accessories, as well as desired gimbal placement on that website.

 

But I'm just some guy who likes light and optics who hopes dear Robert can find a solution to his monitor dilemma. Maybe I'll invade the CForum to wax poetic for a bit.

 

 

ONE

[Jason Williams]

I don't know if this will be of any help, but over at a different forum we've been looking into the possibility of a cheap green screen CRT monitor (around £100/€145/$174), but there's been some debate as to whether it's truly green screen or black and white, and I'm actually waiting for someone to get back to me with more details, but in the mean time here's the thread for that discussion:

 

http://www.steadiforum.com/showthread.php?p=2485#post2485

 

HTH

 

Jason

[RobVanGelder]

If they have a green phosphor imaging coating inside it is a greenscreen.... but it doesn´t say anything about the real characteristics.

These monitors used to be installed in the older ATM-machines or in CNC-machines and are generally with low-sensitivity phosphor. Probably to avoid burn-in as most of the signs on these monitors are projected on the same place for a long time, if not for their working life.

So light output is often low and a green filter will not help much, maybe only for contrast.

I bought once 2 of these, very cheap and with a little extra board they could show a regular videosignal.

I also put in some extra high voltage diode-bridges that made them a bit brighter, but of course it doesn´t go well with the phosphor. Some ghosting and burn-in possible, apart from being risky in getting a nice shock.. :lol:

But for the money a nice toy to play with, just don´t expect too much from it.

[Robert Eder]

Hello,

 

Thanks for the answers and the interesting off topic discussion about the human eye and cockpit instrumends in a different variety of planes :)

 

i will go for a panasonic, its even cheaper and i´ve been told that its good as backup or lightweight display when i can afford a better one.

 

i am not shure if i should buy a frameliner, but i already started a discussion in another thread concerning this topic.

 

thanks for helping out!

 

greetings, robert

[Mikael Kern]

One more thing about why we use red in aircrafts over green is that it is a neutral color, so to speak, and it doesn't modify color nuances as found on charts for example.

 

I am surprised that a cameraman would call red a neutral color. Have I ever seen a neutral color? :-)