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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 :)

DR ..a good discussion!!

Cinema style...



:smiley:
 
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Since a few people are sharing some test footage, I'll also like to share one mini lowlight test I did last year for a potencial client using Helium.
It was still firmware v6, so old ISO calibration.
I don't remember specifics right now but if you have any questions I'll try to dig deep in my brain here hehe
IMO Monstro and Gemini are a step up in lowlight, but Helium is still a great lowlight camera.

https://drive.google.com/folderview?id=1hz5-A37fozQywq0A44uF0uWK4veaLzr2
 
Fabricio,

Heres the 800iso enhanced

Original

A001_C001_0101_Q1.0000005_F_S000.0000000.jpg



fabricio_night22.jpg



The one above was done with 3DLut Creator with just a "luminance" curve. Here is an approximation of the same thing in Redcine-X with a .RMD file


https://www.dropbox.com/s/xxndh39lzmihcwy/fabricio night 2.RMD?dl=0


Redcinex_version.jpg
 
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Nice Rand. On the Lut creator did you dial down the greens a little bit in the shadows as well?
The green cast is something some clients have complained a few times...
 
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Fabricio,

Yeah, In 3DLUT Creator you can work separately in the Shadows and The Mid/Highs. But let me try to fix the greens in the redcinex version I will post it.
 
Here are those Gemini & Helium overexposure comparisons from earlier -










Comparing their clipping points -

 
Fabricio


I had to change all the light bulbs in my mothers home to, what I believe are the bulbs in this photo, "daylight" balanced LED's. She just likes them better than the "tungsten" bulbs.
 
Les Hillis said:
Here are those Gemini & Helium overexposure comparisons from earlier -










Comparing their clipping points -

Click to expand...
I haven‘t followed this thread for a while so lost track.
Can anyone please explain this overexposing tests between Gemini and Helium? And why shoot Helium at ISO 1600 in daylight? Old ISO calibration? Would be interesting to test against Helium using Skintone OLPF at ISO 320, which is what I shoot most of the time.

Looking at the last dark images of clipping point, I see that Gemini retains highlight a little better than Helium. But not by much. Not that is is worth downgrading from Helium and pay 5K extra. Or I am missing something?

FYI, I am looking the images from my iPad.
 
Thai Christen said:
I haven‘t followed this thread for a while so lost track.
Can anyone please explain this overexposing tests between Gemini and Helium? And why shoot Helium at ISO 1600 in daylight? Old ISO calibration? Would be interesting to test against Helium using Skintone OLPF at ISO 320, which is what I shoot most of the time.

Looking at the last dark images of clipping point, I see that Gemini retains highlight a little better than Helium. But not by much. Not that is is worth downgrading from Helium and pay 5K extra. Or I am missing something?

FYI, I am looking the images from my iPad.
Click to expand...

Hi Thai,
I have done this simple test to have an understanding of the highlight range that the sensors are capable of, in the extremes. I had a base of 800 and also did set the iso at 1600. 1600 was to see how the sensor behaves in comparison to 800 which will be useful in the interior-exterior scenes. The calibration is the new calibration. I see that the Gemini holds the Highlights range better than Helium at the extremes, so as the shadows. I find the Gemini very close to Monstro in the Highlights range.

I like to call the Gemini as a Baby Monstro.
 
sreenivasa reddy s said:
Hi Thai,
I have done this simple test to have an understanding of the highlight range that the sensors are capable of, in the extremes. I had a base of 800 and also did set the iso at 1600. 1600 was to see how the sensor behaves in comparison to 800 which will be useful in the interior-exterior scenes. The calibration is the new calibration. I see that the Gemini holds the Highlights range better than Helium at the extremes, so as the shadows. I find the Gemini very close to Monstro in the Highlights range.

I like to call the Gemini as a Baby Monstro.
Click to expand...

Hi Reddy,
Thanks a lot for doing these tests and sharing with us.
However, I am still confused or maybe missing something. But when you say you overexpose by 3 or 4 stops, and yet images look the same. So did you overexposed and pulled back highlights in RedCine X? Is this what theses images show?

I think nobody can deny that Gemini is better than Helium at high ISO. And I have no doubt that Gemini can handle highlights better than Helium. The question is just by how much? These are extremes. In typical shooting situation where you can light your scene, DR is not much of an issue with Helium.
 
Thai Christen said:
I haven‘t followed this thread for a while so lost track.
Can anyone please explain this overexposing tests between Gemini and Helium? And why shoot Helium at ISO 1600 in daylight? Old ISO calibration? Would be interesting to test against Helium using Skintone OLPF at ISO 320, which is what I shoot most of the time.

Looking at the last dark images of clipping point, I see that Gemini retains highlight a little better than Helium. But not by much. Not that is is worth downgrading from Helium and pay 5K extra. Or I am missing something?

FYI, I am looking the images from my iPad.
Click to expand...

I'm seeing the same thing you and Reddy are, with the Gemini having slightly more real-world range than the Helium. People can decide for themselves how important or valuable that is.

I can't remember off the top of my head how much of a visual difference there is between the LLO, Standard and STH OLPF's, but I imagine using the STH OLPF on the Helium might help with matching its highlights with the Gemini's. Testing the differences between all three on any camera would provide an indication of what to expect.

Edit - Just saw your second question Thai. Yes, I just pulled back the highlights on Reddy's test shots in Redcine-X. How much of a difference in highlight retention there is between the Gemini and Helium would depend on what you're shooting. As you say, in a typical situation where you're not anywhere near clipping anyway, the difference wouldn't be noticeable. But the comparison images were there, so I thought I'd have a look. Both camera's have a good amount of range imo.
 
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