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Messages - John Delonghi

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31
Chronos User Discussion / Re: Chronos 1.4 RAW conversion tool - pyraw2dng
« on: February 25, 2018, 09:27:56 AM »
I have made some raw recordings at different resolutions but didn't make a note of the settings.

How can I find out what length and width to put into the script just from the RAW file?

32
Chronos User Discussion / Re: Chronos 1.4 RAW conversion tool - pyraw2dng
« on: February 22, 2018, 01:13:05 AM »
The 4GB limit is going to be an issue when saving in RAW mode, so I'm hoping you can solve it soon!

I tried EXT3 formatting, but I couldn't get it to work.

33
Chronos User Discussion / Re: Chronos 1.4 RAW conversion tool - pyraw2dng
« on: February 21, 2018, 10:23:32 AM »
This is going to help a lot when lighting conditions are not as good as we'd like them to be.

I've done a couple of quick tests and this is the workflow I've used for them as it may help you if you want to try recording in RAW mode.

1. Generate .raw file as David outlines above
2. In Adobe Bridge, open the first .DNG file as a Camera Raw file and tweak exposure, sharpness, colour etc. As the DNG is a raw file format you can do a lot here to improve the overall look and quality of each frame
3. Apply changes to all the DNG files and save them. I save them as .JPGs for the next step
4. In Photoshop, Open As... Image sequence and pull in all the JPGs
5. Export... Render Video and save whatever video format and quality you want to use. I've used Adobe H264 max. quality for these test.

The light was really dull when I took these, so the processed RAW version does have quite a lot of noise, but it's a massive improvement from the original and a much better result than I achieved tweaking the brightness, contrast and colour in my edit software.

Here's an original untouched frame from the Chronos H264 version of the clip I saved:

Here's a frame from the final video I rendered from PS:


Here are the links to the videos:

Original from Chronos:
https://youtu.be/6JMfVIYYci0

Original tweaked in edit software:
https://youtu.be/upStvyZh9U0

RAW version tweaked in PS:
https://youtu.be/Dk1ShX0J8WI

34
Chronos User Discussion / Re: Chronos 1.4 RAW conversion tool - pyraw2dng
« on: February 20, 2018, 12:40:04 PM »
Well that's very dramatic. Much more so that I'd see with a jpg/RAW comparison from a DSLR.
Needless to say, I'll be shooting RAW from now on!

Is there any chance of posting a road map of the various key firmware improvements you're working on so we'd get an idea of which will be available when?

35
Chronos User Discussion / Re: Chronos 1.4 RAW conversion tool - pyraw2dng
« on: February 20, 2018, 08:24:51 AM »
It might be useful if you could post here the advantages of shooting RAW with the Chronos...

36
It's not at an angle because of how the mount is machined, it's because the material used is acrylic and there's no latching or locking mechanism built in, so you have to rely on the there being some interference between the adapter and the speedbooster to keep it on tight.

I'm just happy with it being tight enough when it gets close to the correct alignment. I don't want to risk twisting it more and breaking a part off, but if I had the time I could file off small amounts at a time and get it perfect.

You could probably modify the plate to add a pin or locking screws and get the alignment right while still making sure it stays on properly.

37
Yes, it's off-centre slightly but that's because these are essentially hand finished prototypes. If you get one you may be able to get the lens to line up better. Speak to Nathan and see what he says.

I'm more than happy with mine as it's enabled me to try speedboosters straight away. I'm sure more adapters will come along but this one is perfectly good for my needs right now.

38
Yes, the XL works perfectly. The Ultra also worked but the XL is better IMO.

In both cases you would need to play around with the spacers Nathan supplies to get the back focus correct.

Here are a couple of pics:


39
The USB port is on the side of the camera, labelled eSATA/(usb symbol)

40
Software Dev / Re: Horizontal banding
« on: February 12, 2018, 02:35:07 AM »
I tried to replicate the problem but after black calibration, it went away every time on my unit. Glad I checked this post as I was wrestling with the same issue.  If you accidentally change the shutter even a little with the scroll bar it may come back.  I also found that if you do two black calibrations a few minutes apart the banding goes much lower.    :)

This is also good advice. Even at room temperature, when I turned on the camera just now the banding re-appears if I change the shutter. So it's obviously critical to do the black cal again if you change the shutter speed and immediately before recording again.

One thing I tried was to change the offset, as the banding always seems to be in the lower third of the frame. When I set the vertical offset to 0 the view on the LCD is still centred and the banding still appears in the same place. Is this what you would expect?

41
Software Dev / Re: Horizontal banding
« on: February 11, 2018, 10:34:11 AM »
Today I put the camera in a fridge and got it down to 5 deg C.

Switched on and let it warm up a bit then did a black cal. The banding comes back immediately. The camera is still sitting here warming up to room temperature but already it will be warmer than it was when I had the initial problems last week outdoors.

I think this does indicate that constant cold temperatures is likely to cause banding which can't be removed by black cal (or at least not long enough to get a good shot).

Maybe the camera needs some sort of temperature control by varying the fan speed?  Outside temperatures in the UK are likely to be low for several weeks to come and this renders the camera unusable for me while this problem persists.

Is there a workaround you can suggest? If I taped up the ventilation holes would that be safe?

 

42
Software Dev / Re: Horizontal banding
« on: February 10, 2018, 10:26:21 AM »
Is there a sensor in the camera measuring temperature?

43
Software Dev / Re: Horizontal banding
« on: February 09, 2018, 10:48:35 AM »
Will constant low temperature cause it? I had the camera on continuously on Tuesday, so it got as warm as it could but the ambient temperature was always very low.

If this is going to be an ongoing problem when using the camera outside, I'll have to do a black cal immediately before every shot.

44
Software Dev / Re: Horizontal banding
« on: February 09, 2018, 01:48:05 AM »
I also found that if you do two black calibrations a few minutes apart the banding goes much lower.    :)

I'm confused by this statement. Can you explain in more detail please?

45
Software Dev / Re: Horizontal banding
« on: February 08, 2018, 04:10:30 AM »
It was at room temperature to start with and initially when I turned it on there was no band, but after maybe 5-10 mins being on the band appeared.

On Tuesday when I was outside, the ambient temperature was only just above freezing all day, if that helps at all.

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