Recent Posts

1

General Chat / Re: Foveon sensor (SIGMA cameras)

« Last post by Luther on Today at 03:12:35 AM »

[...] and recently there is this that could be the evolution of the Foveon and maybe can be bought and developed by Canon

Nice research. I hope no one closes it with patents. This could represent a new evolution in color precision, if the sensor comes with the spectral sensitivity table (to use as IDT on ACES - as each camera has variation on color absorption).

I believe this comparison should tell all:
https://www.dpreview.com/reviews/image-comparison/fullscreen?attr144_0=sigma_sdquattroh&attr144_1=nikon_d850&attr144_2=canon_eosm50&attr144_3=canon_eos5dmkiv&attr146_0=100_6&attr146_1=100_6&attr146_2=100_6&attr146_3=100_6&normalization=compare&widget=645&x=0.1367195625070196&y=0.5167449200029397

sd Quattro H vs. D850 vs. M50 vs. 5D Mark IV. All with same subject, same exposure, ISO100 + 6EV.

You can clearly see Foveon has more fine details when more light is available. On 1/5 speed, look on the grass areas.

For what I do now (cave/mines photography) my tipical subject is in totally dark enviroment with tripod and a lot of flashes or old magnesium bulb. So I have direct control on scene light like in studio and can shot at low ISO's.
That's basically why I'm looking at those sensors, but also seems that they are working on a new FF sensor for 2020 with L-mount, so I think I'll wait and try to learn more about this before making a decision.

Your best bet for now would be Hasselblad... if you can afford it.

2

Share Your Videos / Re: Anamorphic Look Test

« Last post by Luther on Today at 02:58:22 AM »

I had a true anamorphic adapter (Kowa 16D), and it was a pain in the ass to focus and way too heavy. Also, lots of vignette and not sharp at all. The image looked cool, though.
So, I did mine 'filters' for less than $1 each. Just ask for someone in you city to cut those cheap wood pieces and paint it in black. Here's the shapes:

3

Modules Development / Re: Auto exposure algorithm for shooting - auto iso, ae (autoexpo.mo)

« Last post by Audionut on Today at 01:59:34 AM »

The changes aren't immediately visible in LV.  Requires half-shutter to see the exposure changes in LV.
Things work more smoothly in LV with 'Same TV curve' set to ON.  With Same TV curve set to OFF, I have to press half-shutter, release and press again fairly quickly, for the correct exposure settings to stick.

Could someone who uses this module possibly give a few hints on the use case(s) and how to set things up.

Missed this post earlier.

At the bottom of the module screen is Exposure Value.  You adjust all of the curves, so that at a specific exposure value as measured by the camera, the camera will use the exposure settings as set by the curves.

Look at this image from the OP.


At EV 8, the camera will shoot ISO 100, 1/500, f/4.0.  You can adjust the curves so the the camera will use some other exposure settings at that EV.  Higher ISO, more narrow aperture, faster shutter, whatever.
In the above module settings image, the orange EC line is indicating underexposure at those current settings.

Here's another curve arrangement.


At EV 8, the camera will shoot ISO 100, 1/4000, f/1.4

You basically use the module to tell the camera, at this EV, use these exposure settings.
Canons auto mode has some quirks.  And you're stuck with the exposure settings that Canon decides to use, only having EC to apply some changes to Canons auto mode.  This module is full customization of exposure settings that will be used.  Once you have the initial setup done (curve arrangement), then it works exactly like an auto mode.  Point and shoot!


Another nifty trick is being able to meter the scene.  Press half-shutter then enter the module.


The blue vertical line shows the measured EV.
The above image is the same settings as the next image above, with EC +0.5 dialed in.  You can see the effect on the exposure settings.

4

Share Your Videos / Re: 3.5K Raw Testing - 5D III

« Last post by whitelight on Today at 01:47:02 AM »

Nice!

I see some flickering of "black bars". Is it youtube compression artifacts?
I've never seen it elsewhere before.

Oh, yes, very strange. Made me worry my monitor had a bad problem.

5

Share Your Videos / 700d Raw test using the experimental 2.5k crop mode preset

« Last post by frafen on Today at 12:49:29 AM »

I tried the 2.5k preset of the new experimental build for the 700d. The recording resolution was mostly 2400x1200p at 12bit.

https://www.youtube.com/watch?v=ElDhiMwRZYA&feature=youtu.be

6

General Chat / Re: Foveon sensor (SIGMA cameras)

« Last post by scrax on Today at 12:28:26 AM »

If noise is "ok only at 100 - 200 and 400" then the dynamic range is bad. Nikon, Sony and Pentax are also having so called ISO-less sensors, i.e. it doesn't matter if you dial in ISO 3200 or ISO 100 and push the file by +5EV in postprocess: the results will be the same.
If there is potential to recover highlights, then the photos are probably not ETTR-er. No surprise, as all DSLRs I know tend to underexposure.

From my readings (and experiences on bayer) what you say is right for bayer kind sensor but foveon is not working same way because how it works and how the RAW files are generated (they are not really the RAW data from the sensor, for basically two reason one tecnical and one purely commercial (Sigma hides the algoritms to reconstruct colors by not giving out pure raw data from sensor).

For what I do now (cave/mines photography) my tipical subject is in totally dark enviroment with tripod and a lot of flashes or old magnesium bulb. So I have direct control on scene light like in studio and can shot at low ISO's.
That's basically why I'm looking at those sensors, but also seems that they are working on a new FF sensor for 2020 with L-mount, so I think I'll wait and try to learn more about this before making a decision.

I have basically only EF lens so going to the new mount R, M or L (the new mount Sigma, Leica and Panasonic are working on together) will be almost the same for me (all them will work with a 600$ adapter for EF  )

7

General Chat / Re: Foveon sensor (SIGMA cameras)

« Last post by ArcziPL on Yesterday at 11:35:23 PM »

Noise and ISO are ok only at 100 - 200 and 400 and from reading how it works on dedicated forums it's because is like a camera with only 100 ISO film.
Changing it is just a "memo" for the raw processor to push up exposure in post, that's why it gives so much noise at high ISOs
But sharpness and details are great.

If noise is "ok only at 100 - 200 and 400" then the dynamic range is bad. Nikon, Sony and Pentax are also having so called ISO-less sensors, i.e. it doesn't matter if you dial in ISO 3200 or ISO 100 and push the file by +5EV in postprocess: the results will be the same.

I believe this comparison should tell all:
https://www.dpreview.com/reviews/image-comparison/fullscreen?attr144_0=sigma_sdquattroh&attr144_1=nikon_d850&attr144_2=canon_eosm50&attr144_3=canon_eos5dmkiv&attr146_0=100_6&attr146_1=100_6&attr146_2=100_6&attr146_3=100_6&normalization=compare&widget=645&x=0.1367195625070196&y=0.5167449200029397

sd Quattro H vs. D850 vs. M50 vs. 5D Mark IV. All with same subject, same exposure, ISO100 + 6EV.

Seems also to have a lot of potentiality in recovering highligts (at least).

If there is potential to recover highlights, then the photos are probably not ETTR-er. No surprise, as all DSLRs I know tend to underexposure.

8

Share Your Videos / Re: 3.5K Raw Testing - 5D III

« Last post by Dmytro_ua on Yesterday at 09:48:58 PM »

Nice!

I see some flickering of "black bars". Is it youtube compression artifacts?
I've never seen it elsewhere before.

9

Raw Video Postprocessing / Re: MLV App 1.6 - All in one MLV Video Processing App [Windows, Mac and Linux]

« Last post by masc on Yesterday at 09:08:22 PM »

... if it already kinda supports dngs that it has to unpack from mlv.

There is no dng in a mlv. Completely different. There is "just RAW data inside". But even that is organized in different ways.

10

Share Your Videos / Re: 3.5K Raw Testing - 5D III

« Last post by Rob Curd on Yesterday at 08:38:00 PM »

@dualmp

It was 3.5k raw using 10bit lossless . Frozen live view. Waveform on screen.