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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Mysterious Black Spot????

B

bscibelli

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This spot started appearing the other day on a shoot. It was not there in the morning when we were shooting inside a moving car, but as we went into the afternoon, it started to appear....now it will not leave.

http://clients.cinemanix.com/media/RED/red_spot_issue.jpg

We tried 2 different lenses and it was still appearing in the same spot. At a glance, there was nothing on the filter in front of the sensor, and I have a Delkin Sensor Scope, and under magnification, there was nothing on the filter.

At 4K 2:1, it is right there in the frame, at 3K 2:1, it is visible, but out of the captured frame, and at 2K 2:1, it is not there.

I was wondering if anyone has seen an issue like this....I am hoping that it isn't a cluster of dead pixels, but I just thought that I would ask.

Thanks!
Bryan
 
I have never seen something like this before. Honestly, it looks more like a UFO than a cluster of dead pixels. I know this doesn't help you but in my opinion this looks like an optical problem and not digital.

Let us know what it was when it's fixed!


PS. Did you by any chance shoot straight to the sun?
 
Hi there,

I read your post really quick so I may have missed if you tried this, but take a look at your sensor. My guess is that there is a piece of dirt on the sensor. I saw something EXACTLY like this on my nikon D80. It drove me nuts as we were shooting stills of aircraft schematics. I had no idea what it was, but then I went on line and read how I can get the shutter to stay open for cleaning. I saw the piece of dirt perfectly clear.

So again, my guess is that something just needs to be hit with a gentle, gentle, gentle, blast of air. Let me know if that worked.
 
By the way- I have seen two dirt particles on a some of the stuff Mike and I shot on Red 200 (I think was his number). We were shooting the space shuttle, and while changing lenses we got two tiny dust particles that flew in. They were exactly like what you have only very very small. A little bit of air and they were gone.
 
Yes it is. When I say "on the sensor" I am really meaning on the OLPF. Dirt and dust can get on that if you're not careful. I have seen a tiny bit before. You need to be really careful about leaving it exposed while changing lenses.

In his case, he may not have even changed lenses, however, particles can still get on the OLPF. Lets hope that it is not a piece of dirt between the OLPF and the sensor. My bet is that it is sitting right on the OLPF.
 
One way to tell if it's dirt on the OLPF: does the spot get harder to see at faster f-stops? If it is visible at f/22 and invisible at f/2 for example, that strongly suggests it's dirt. If the spot size and contrast is unchanged with lens f-stop, then it cannot be dirt, and I assume it is some sensor or software thing.
 
I think this might be some black paint that has fallen off INSIDE the sensor chamber, between the OLPF and Mysterium. I have never seen a piece of dust that sharp and big on an X series camera. The OLPF is just too far away.
Try using your scope to look past the OLPF to the sensor. It will be at the top of the sensor not the bottom, images get projected upside down onto the sensor.
 
jbeale said:
One way to tell if it's dirt on the OLPF: does the spot get harder to see at faster f-stops? If it is visible at f/22 and invisible at f/2 for example, that strongly suggests it's dirt. If the spot size and contrast is unchanged with lens f-stop, then it cannot be dirt, and I assume it is some sensor or software thing.
Click to expand...

Hi, I work with Bryan and yes it changes its visibility depending on the F stop. I believe it's more visible at F/22 than F/2.8. At 2.8 it looks like a faint blob...
 
3xm, you guys don't see a tiny piece of dirt at all if you remove the lens and look directly at the sensor?
 
Bryan is trying it again. He already cleaned it once and he said using the scope that came with the sensor cleaning kit he said he didn't see any dirt at all. But it's worth taking a second look... We should know in an hour.... Thanks for all the replies and advice!
 
Thanks so much for the replies, it is driving me crazy that nothing seems to work.....Still no luck with the spot. I have tried the following:

Rocket blaster to loosen any debris
Sensor swab from the Delkin kit with solution

Using the sensor scope under light/magnification, I still can not see anything visible on the filter or on the sensor.
 
Have you tried shooting with different lenses?

I would try shooting a grey card, both in focus and completely out of focus.

I fear your only fix may be a trip back to the mother ship.

Good shooting and best regards,

Leo
 
Mysterious Black Spot

Mysterious Black Spot

i´ve encountered the same spot last week. it was clearly visible already on the lcd (and on the rendered files).
this time, on my camera, on the left third of the picture. meanwhile i tried all
kinds of hints and tipps. no success yet.
the two other cameras do a great job since three months. any news?
 
We just discovered a very similar piece of dust on our sensor. After determining that it isn't on the OLPF, we have no option but to send it back for cleaning by Red. As far as stops, at 4 or lower it seems to be invisible. There really should be a way to remove the OLPF if one has to.
 
Hi Guys...I know it was stated that the spot stayed in the same place with different lenses, but I had a problem spot that looked just like this on a film shoot a while ago...didn't see it in the finder as it was on a remote camera with a fairly poor video assist image.... after seeing the rushes, we looked closely at the lens and the spot was a piece of black paint used to coat something inside the lens, that had come off and stuck to the inside of the front element. The lens was a very wide 10mm that was wide enough for this piece of paint to actually be in fuzzy focus at deep stops. This wouldn't have been nearly as visable if it had been on a longer lens.

Of course, if the spot is still there thru several leness, this is not your problem...but just trying to cover all the bases.


Larry
 
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