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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 :)

Dragon w/New OLPF issue? (Addressed by Red)

Zeb B

Zeb B

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The red dots happen when you shot into the sun on certain angles . Interesting I thought it might've disappeared with the new sensor.
 
Wasn't seeing this on the wide angle lenses and this shot was slammed with sun - but that blown out was the effect I was going for so a bit concerned about the appearance of the red dots from hell when point the Dragon into the sun like this. Will do testing when home this weekend after this project wraps.
 
Maybe on a cell phone . . . not on a fuckin $100K Cine Cam rig that is suppose to kill film!! ;-)
 
It is kinda strange. I was specifically testing for this when I had the prototype back in August, and it did not happen on that, with either of the lenses I used.

This is the new OLPF?
 
Gunleik Groven said:
It is kinda strange. I was specifically testing for this when I had the prototype back in August, and it did not happen on that, with either of the lenses I used.

This is the new OLPF?
Click to expand...

Yup

I'll shoot some direct into the sun shots at sunrise manana. Any suggestions for the test? Think that was the Summicron-C 100mm in the R3D. I want to test some with the HDR as well. Something odd with that as well. Did a 2 stop later on that same day and it was nearly blacked out - like this was at 6 stops.
 
Matt Ryan said:
The MX did this as well when the lens was closed down and looking at the sun. The new olpf was supposed to remove this. Disappointing.
Click to expand...

Don't panic yet - could be me. More tomorrow and this weekend when I get back home to a real computer n stuff. I have shot a bunch since getting the Dragon a week ago - first freaky frame so lemme dig further and upload the results.
 
I assume you shot this at T16 or above? In doing so you are creating a pinhole laser beam which reflects backwards and forwards off the OPLF and back of the iris blades when you point it straight at the sun. This pattern has been evident since original M chip and is not going to change with the OPLF design.

Simple fix is to use ND and open up the iris.
 
"It is kinda strange. I was specifically testing for this when I had the prototype back in August, and it did not happen on that, with either of the lenses I used."

It varies lens to lens- depends entirely on how Matt or reflective the back of your iris blades are....
 
I've only seen it once when shooting into the sun and the lens was very closed. I hardly shoot with a closed lens, so I've never had problems with it. I think I experienced it when I had my lens from a f16-f32, but when I shot wide open it went away. That was on the old OLPF.
 
Jeff Brown said:
I assume you shot this at T16 or above? In doing so you are creating a pinhole laser beam which reflects backwards and forwards off the OPLF and back of the iris blades when you point it straight at the sun. This pattern has been evident since original M chip and is not going to change with the OPLF design.

Simple fix is to use ND and open up the iris.
Click to expand...


Correct....


But it would be nice if it wasn't there.
 
Is there a way to determine it the interference pattern is the glass elements at the back of the lens - or the OLPF?

I would have thought that when shining bright light through a narrow enough aperture - even film would get circular blobs of Red & Blue.

http://toothwalker.org/optics/flare.html

AJ

EDIT : Good news on this issue begins with reply #40
 
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