Comparing sensors. How the "native" color of infrared varies depending on the camera.

[Fedia]

That's cool ! I hope you recieve your camera soon ! Don't worry about getting the exact same magnet as long as it is the neodyme type.

[Fedia]

On 7/30/2023 at 12:18 AM, Fandyus said:

Demosaicing was bypassed

By the way, what software did you use to bypass demosaicing ? I didn't know it was even possible !

[lukaszgryglicki]

You can do this for example in AccuRaw Monochrome. Many other programs exist.

 

[Fandyus]

@Fedia Thank you.  I used Darktable, I think Darktable is by far the best software for our kind of photography. It has a lot of powerful functions, can display the images in a very flat, objective manner, is free and opensource and much more.

[Andrea B.]

You can't beat free! I have Darktable but need to learn more of its tools. It has so many!

[dabateman]

6 hours ago, Fandyus said:

Update: I am now also getting this camera. I have already negotiated with a seller. Unfortunately, there are some hiccups shipping wise, but I hope all goes well.

I didn't know I'd end up buying another camera this soon, but this one is just too cool not to get, especially since it can be had for so cheap.

Thats great. Soon you will have an odd collection of Foveon,  mixed color RGB and your Cmos camera.

Hope it works for you. 

I thought about it for a minute,  but would rather have a full spectrum Fujifilm 50S.

[Fandyus]

47 minutes ago, dabateman said:

Thats great. Soon you will have an odd collection of Foveon,  mixed color RGB and your Cmos camera.

Hope it works for you. 

I thought about it for a minute,  but would rather have a full spectrum Fujifilm 50S.

Haha I would love to get a foveon next, but truth be told, the money is not the best right now. I probably shouldn't even be getting this one truth be told. But I am too tempted.

[dabateman]

1 hour ago, Fandyus said:

Haha I would love to get a foveon next, but truth be told, the money is not the best right now. I probably shouldn't even be getting this one truth be told. But I am too tempted.

All depends on your timing.  The SD14, did have a window where I saw used ones for around $100. But then shot up again.

If or when Sigma releases the L-mount Foveon,  the older SA-mount cameras will be cheap again. 

Unless there is something wrong, then old models can get expensive again. 

[lukaszgryglicki]

10 hours ago, dabateman said:

Thats great. Soon you will have an odd collection of Foveon,  mixed color RGB and your Cmos camera.

Hope it works for you. 

I thought about it for a minute,  but would rather have a full spectrum Fujifilm 50S.

Fuji 50R will be cheaper and uses the same sensor AFAIK.

[Fedia]

I tried digital aerochrome with the F828. I didn't know what to expect given this camera's particularities.

 

My initial idea was to use the filter combo I use on my Canon : 550nm + DB850. I tried but turns out it is impossible. The camera appears to be globaly less sensitive to IR than my canon and I use the DB850 and the orange filter the blue channel is really low signal. The white balance is impossible in camera. It is sort of possible from the RAW files in darktable but it brings too much noise and makes the blue channel clip in the blacks.

 

So I took off the DB and used the 550nm alone. White balance in camera is still impossible but works in darktable. Some exemples :

 

 

 

 

 

I shot red objects to evaluate the color shift :

 

 

 

 

The zoomers on the pier :

 

 

 

Channel substraction settings :

 

IR

R -40% IR

G -30% IR

 

The color of the foliage lean toward magenta a little. There must still be IR leaking in the green channel and I could have substracted 10 or 20% more but I like this hue better than true red and also wanted to bring out the pinks in the grass.

 

Comparatively my Canon with just the 550nm needs channel substraction settings like this :

 

IR

R - 100%IR

G -50%IR

 

and a little bit of saturation to get this :

 

 

 

Using the 550nm + DB850 on my Canon the IR substraction settings can fall down to this

 

IR

R -35% IR

G -0% IR

 

 

 

 

 

Globaly in every situation the color of the trees is rather uniform. The 550nm longpass technique has some limitations.

 

For another way of achieving digital Aerochrome make sure to check out this topic :

 

 

 

[colinbm]

What a fantastic collection Fedia.

[Fedia]

Thanks !