fried ccd, or lens, i dunno

T

tylerb

New member
I was taking some sunset shots a few months back, just testing out my new camera. And now there are hexagonal shaped spots appearing everywhere on playback. It tends to be more noticible when there is daylight or a strong light source glaring into the lens. Its really noticible and i need to know what the heck is wrong, cuz it still is on warranty and if its gonna be costly to replace the ccd, then i need to know.

Thanks for any info yall can provide.

rollerz_only@hotmail.com
 
Re: fried ccd, or lens, i dunno

this is called lens flare, it always happens when you put your lens towards the sun.
Lens flare is caused by light rays being reflected on the glass.
There is nothing wrong with your camera, the CCD and lens are perfectly ok.
By the way, many people even use software to get proper lensflare...
 
Re: fried ccd, or lens, i dunno

I know what lens flare is, but this isnt it im sure, Im talking like standard overcast days, and there are large spots in the same exact spot everytime. I've played with a few other cameras in the dvx100 class, and have never experienced this before. I've heard of damagaing or "burning" ccd's and need to know if thats what i did
 
Re: fried ccd, or lens, i dunno

I think what you see is *aperture ghosting*. It's a form of image forming ghosting due to light reflecting between the CCD surface and the aperture blades area. Do you get this problem at full open aperture too?
 
Re: fried ccd, or lens, i dunno

Thats when i get it the most, is at full aperature, but there is some definate permanent damage with this, a regular flare causes streaks of light, whereas this is a perfectly shape hexagon in a specific location on my lens, and as i view the footage more and more, i notice other spots the exact same size and shape, of course a direct light almost has a prism effect on it causing the hexagonal spots to illuminate with color and make them much more noticible.

This problem came from a very bright sunset where the camera was directed at the sun for nearly 2 minutes, I seriously think this damage is permanent, please tell me im wrong.
 
Re: fried ccd, or lens, i dunno

If the problem persists even with open aperture and it's really on a fixed area, it's not aperture ghosting but you most probably fried your internal IR filter and/or it's coating. CCD imaging devices are IR sensitive and thus contain an (absorption) IR filter which mostly covers the CCD. The sun spectrum shows relative strong amounts of IR energy especially at sunset. When you expose the evening sun, long enough to your CCD, you will not only see the sun but the absorbed IR will heatup the filter and change it's optical properties in that area. The reason why it has an hexagonal shape is due to diffraction.
 
Re: fried ccd, or lens, i dunno

if you look in your manual it says " DO NOT POINT YOUR CAMERA DIRECTLY AT THE SUN, IT MAY RUIN YOUR CAMERA"
now if you had some nd filters on it and what ever else to stop down the light you may be ok...but if you were using it "unprotected" haha you may be screwed...
 
Re: fried ccd, or lens, i dunno

Even using ND filters doesnt solve the problem. If the exposure for the sun area is set at a level just below the vertical smear onset , the local IR energy on the internal IR filter is high enough to warm it up after a couple of minutes. The thermal resitance in the filter area is very high, so heat builds up gradually. A (reflective) IR blocking filter in front of the lens could solve that problem.
 
Re: fried ccd, or lens, i dunno

[quote author=andre link=board=Events;num=1091991784;start=0#8 date=08/09/04 at 07:21:45]a level just below the vertical smear onset, the local IR energy on the internal IR filter is high enough to warm it up after a couple of minutes[/quote]


err . . . that sounds like a question for a gyneacologist ! :o ;D
 
Re: fried ccd, or lens, i dunno

And another question?
Why would so many opinions on the forum say...GO AHEAD...NO PROBLEM IN SHOOTING SUNSETS....with DVX.
 
Re: fried ccd, or lens, i dunno

Telerb, do you remember the cam settings? Did you happen to set high shutterspeed?
 
Re: fried ccd, or lens, i dunno

the shutter speed was set at i believe normal 1/60 or whatever, the fstop was around 4-5.6 with an ND2 on, and my question is to you panasonic users, will warranty cover repair of this, and if not what am i looking at to get this fixed cost wise?
 
Re: fried ccd, or lens, i dunno

It's important to keep shutterspeed as low as possible in those cases, 1/60 should be is OK. Remember that the heating power on yr CCD (IR filter)for the same picture set at 1/60 vs 1/10000 is 150 times higher for the latter case. For future sunset pics use an IR filter or interval shooting.
 
Re: fried ccd, or lens, i dunno

the first thing everybody told me was to buy a 72mm UVfilter and leave it permanently on the camera to protect the lens from any unwanted strong light, and so I did. did you have any filter on the camera besides the nds that the camera itself has? ???
 
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