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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 OLPF tests

Les Dittert

Les Dittert

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Dragon is a 65mm film killer. Lens: Sigma 18-35mm at 5.6. This is a sharp lens.

First image, the framing of the test shot ( shot 6K FF 30 FPS ):
DRAGON_6K_framing.024.jpg


Below Next, 2:1 blow up of RCX processed , with OLPF in, ADD snap of the parking sign. Note the slight color aliasing of the tree branches :
DRAGON_OLPF_ADD.024.jpg


Below is the Dragon with no OLPF. Custom processed. That's all I can say. Faster than ADD.
DRAGON_NO_OLPF_PHA.024.jpg
 
Very, very nice indeed.

But then I will have to use a filter to make it look less sharp, because
I don't particularly like my movies looking too sharp.

:)
 
"Custom processed. That's all I can say"

Why so secret?
 
Les does removing the OLPF void the warranty? I ask because I want to try also. I'm guessing it might be useful if there's the intention of cropping the image.
 
Mark Pugh said:
Les does removing the OLPF void the warranty? I ask because I want to try also. I'm guessing it might be useful if there's the intention of cropping the image.
Click to expand...

No, because I had to remove it to flip it. Red said it's OK due to the mix up of the OLPF being installed backwards by mistake.
Removing it on the Epic was also OK , when working with the flare guard that was shipped after the camera was out.
Keep in mind that you can not shoot with nothing in there as the back focus would be way off. Also IR issues. Also dust issues.
I have worked with sensors that by themselves cost more than a Dragon camera, so I am comfortable with these types of things.
 
Hey Les,

It might just be my untrained eye -- I'm curious, is there a bloom or a glow to the custom setup you have? I notice it mostly on the branches. For the sake of discussion. Otherwise I'm ridiculously impressed. It's like the difference between the D800 and the D800E (Minus the IR filter). Worst outcome for us shooting on Hasselblads is the dreaded moire. Is that also a result on what you've done?
 
Can we see the 65mm vs Dragon A/B comparison?
 
What is noteworthy is that there is more colour aliasing with the OLPF than without. How does that work??

I have seen comparisons between a Leica M8 and the older Portra 160. The M8, with a 10Mpx sensor and no OLPF, was sharper and cleaner. I expect that we would see similar results today. In fact there is no reason why you can't compare the Dragon to 8-perf 35mm Portra 160 - no need to drag out the Arri 765. I'm sure you have a 35mm SLR hanging around somewhere? ;-)
 
Stacey Spears said:
Les, can you post an image of w/o OLPF that has not been post processed? Did you put your own IR filter in? Your results are awesome!
Click to expand...

I'll post a R3D snap this weekend for you guys to see.
I didn't post the processed Epic no-OLPF version because I don't want to upset the apple cart. I will have more interesting test images on my Ipad at NAB however.
These cameras so far outdo film it's not even funny.

In this test I used an AR coated glass window.
 
Karim D. Ghantous said:
What is noteworthy is that there is more colour aliasing with the OLPF than without. How does that work??
Click to expand...

Noticed that too. Its possible that the post processing the Les uses removes /reduces it. If so, he could always build and sell an OFX plug-in or its something RED can improve upon later in the debayer or a post process. I will say that I would rather the OLPF do less than more. Meaning its okay to have a little moiré than to filter it all out and remove additional detail.

Les, in your opinion, do you feel that the Dragon OLPF preserves more detail than the MX OLPF?

Where will you be at NAB? Would love to see the results and meet you as well.
 
Stacey Spears said:
Les, in your opinion, do you feel that the Dragon OLPF preserves more detail than the MX OLPF?

Where will you be at NAB? Would love to see the results and meet you as well.
Click to expand...

Cheers Stacey,
The OLPF on Dragon is very well tuned for the sensor. The fact that a sharp lens can make tiny color errors indicates this. The MX was overly blurry, overly 'safe' .
Maybe I'll try the Dragon OLPF in the Epic !
I still like none however ;)

I'll be NAB floor browsing mostly Monday and Tue. I like chatting with fellow Red users any time !
 
Terrific Improvement ...

Terrific Improvement ...

Les -- Looks fabulous ! Very interested in Epic/Scarlet equivalent experiment.

In your 'enlargement' of the image without the OLPF, it looks as if there is a
very, very thin green 'band' along the bottom edge & a bit up the sides. This
an artifact of the screen capture ? Anyone else seeing this (or just me ) ?
Could this 'green band' somehow be from the green in the sign (OK, I'm
grasping at straws).

Please keep the info comin'

Serge
Scarlet 1534
 
I did some shooting with Phantom Flex 4K with no low-pass filter a few months ago and it was insanely sharp. My shots had moire, but damn, they were sharp and detailed.
 
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