GH2 EVF = DLP rainbowtastic ... is AF100 the same?

S

Saddler

Well-known member
My eyes have been tested to have a refresh rate 10 times higher than average. Consequently, I can't watch most DLP TVs or projectors without seeing rainbows everywhere when I move my eyes across the screen. I just received my GH2 and I know that the EVF is supposed to be much better quality than the LCD. Unfortunately for me, it looks just like a DLP does, with RGB rainbows streaking across all higher contrast areas of the screen. I'm planning on using an AF100 as my A Cam. Does the AF100 have the same EVF?
 
Yep, AF100 has the same. I am not that sensitive to DLP as I run a DLP projector at home with 2x wheel spin, but on my AF100, if my eye shifts, I DEFINITELY see the rainbow in the EVF. No question.
 
I have seen this same thing on the EVF on our HPX-300. I always wondered what it was. Good to know it's just the fast twitch muscles in my eyes working overtime. Must be all those carrots I make my kids eat.

Alex
 
Yep. I see rainbows all the time with single chip display systems. I can't even watch a single chip DLP projection. I can barely make out an image, it just looks like a mess of colors to me.
 
Okay, well it looks like EVFs are officially dead to me now. Glad to know I'm not the only one though.

Jarek, same here. I can view DLP projectors in theaters that use three chip systems with solid-state illumination, without issue. But a standard single chip projector even at 6x spin of the color wheel is like a carnival on acid.
 
I'm glad it's not just me. My friends and work colleagues all used to look at me in a funny way when I came out of meetings or showings complaining about the acid trip rainbows.

I find the EVF on the AF100 bearable for getting focus using the focus-in-red on monochrome, but I absolutely could not use it for any length of time, especially not if I was moving around. Seasickness ahoy!

So I'm glad the LCD is a good tool for framing.

Cheers, Hywel.
 
I love the rainbow effect, it gives making videos a kind of a hippie experience......
WHen I was younger and I first so the rainbow I was like WOW I want one of those.....
 
Saddler said:
My eyes have been tested to have a refresh rate 10 times higher than average. Consequently, I can't watch most DLP TVs or projectors without seeing rainbows everywhere when I move my eyes across the screen. I just received my GH2 and I know that the EVF is supposed to be much better quality than the LCD. Unfortunately for me, it looks just like a DLP does, with RGB rainbows streaking across all higher contrast areas of the screen. I'm planning on using an AF100 as my A Cam. Does the AF100 have the same EVF?
Click to expand...

So .. what test would that be exactly? I come from a family of ophthalmologists and "refresh rate" isn't one of the
tests they do :-) The only tests I know of that comes even close are the spatial locality and sweep visual tests.

jeff
 
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Well, it's been 6 years since I was last tested, but "refresh rate" is my paraphrase for what the opthalmologist seemed to be describing in relation to the specific test in which there was an order of magnitude between my results and the average for that test. I don't know the specific test, but from googling, I believe it was the perimetry or kinetic perimetry test; "Perimetry or campimetry is the systematic measurement of differential light sensitivity in the visual field by the detection of the presence of test targets on a defined background." I have the printout for my tests somewhere, so I'll try and dig them up.

There really isn't a test to measure an individual's sensitivity to "refresh rate", or persistance of vision? There must be an explanation for why some people don't mind working on 60 Hz CRTs, while others are constantly aware of the low refresh rate on the same screen. And why do some see prismatic RGB trails on DLPs and GH2 EVFs while others don't?
 
Sorry Saddler, there are no human beings having a ten times higher flicker fusion theshold.
I also belong to the very sensitiv people having a higher flicker fusion thershold then normal people ( something about 25 %) so that means people like us even see on an old crt Monitor at 75Hz flicker, and 85 Hz just on the edge notto be painful.
But I dont know anybody who has an flicker fusion theshold from 500 or more Hz.
BTW If people have problems with sequential pictures like Single chip DLP or LED EVF is not only a question of the flicker fusion thershold.
Most is a question how people watch a large image. Some focus more the middle and some moving arround the image. Mostly the last group have problems with rainbow effect on Dlp or other sequential devices.

Anyhow who is interesting in flicker here the wiki link
http://en.wikipedia.org/wiki/Flicker_fusion_threshold

Best wishes from Shanghai
 
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PeterMedia, you're crushing my last hopes of being special. Yes, exactly, 85 Hz was an absolute threshold of pain for me on CRT monitors (even with my Computer Vision Syndrome prescription glasses). I found my perceptible threshold level of a stable image on CRT monitors to be at 110 Hz, but that's the max refresh that I could run back in the day at full resolution, so it's possible that I could have perceived a difference above that. In any case, I finally felt comfortable when I was able to work at that rate.

Thank you for the official term; "flicker fusion threshold". I'm not sure where you came up with the 500 Hz number. If we're assuming that the average level for solidly surpassing the persistence of vision to be at 24 fps, then an order of magnitude beyond that would be at 240 Hz. I know for a fact that with CRT technology viewed in close proximity I can perceive a flicker fusion threshold at roughly half that rate. Also, from the link you posted; "some retinal ganglion cells can maintain firing of rates up to 250 Hz". Despite my misunderstanding and paraphrasing of the process behind the flicker fusion threshold, that fact supports that it is indeed probable that a human could perceive up to an order of magnitude beyond the threshold for the human perception of a stable flicker fusion threshold.
 
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