fp L ISO 6 testshot

With Kipon Iberit 75mm F2.4 lens set to F8 or F11 (I forgot which).

Downsized to 30mp.

19mb download for 30mp image

Some of the highlights are blown in this image, which saved me from lightening the shadows too much.  However, the rendering of blown parts is pretty interesting.

Screenshot shows just a glimpse of the strange highlight rendering.

Tom Schum wrote:

With Kipon Iberit 75mm F2.4 lens set to F8 or F11 (I forgot which).

Downsized to 30mp.

19mb download for 30mp image

Tom, I often wonder what trickery is involved with the fp's 6 ISO. The reason I say that in this is because your scene looks about hazy sunlight - about 14Ev according to here .

Taking say f/11, your 2 sec exposure, and an EC of plus 0.7EV, none of the equations or tables come out as 6 ISO.

For example, the given equation according to ISO for normal metering is N^2/t = LS/K where K is a metering constant, commonly 12.5 for cameras, so we can say:

S = N^2/t*12.5/L where L = the daylight luminance of 2048 cd/m^2 (14Ev) and ignoring EC for now.

Therefore S = 11^2/2*12.5/2048 = 0.314 ISO.

Now plus 0.7 EC = 2^0.7 = 1.625 so the ISO accounting for that = 0.51 ISO, not 6.

Another chart for 100 ISO gives about 1/77 sec for f/11 plus 0.7EV. At 6 ISO that would be 1/77*100/6 = 0.217 sec, not 2 sec.

What's going on?!

Anybody?

DMillier wrote:

My Kodak 14n has a ISO 6 mode and complicated things happen with that. It is a computational mode, the camera takes multiple shots including dark frames and blends them all together magically to produce ISO 6.

Now that makes sense, Dave, thanks!

No idea whether this is of the slightest relevance!

So maybe the Sigma/Sony has trickery after all ...

xpatUSA wrote:

DMillier wrote:

My Kodak 14n has a ISO 6 mode and complicated things happen with that. It is a computational mode, the camera takes multiple shots including dark frames and blends them all together magically to produce ISO 6.

Now that makes sense, Dave, thanks!

No idea whether this is of the slightest relevance!

So maybe the Sigma/Sony has trickery after all ...

FP-L does the same way of multi shot to assemble them in camera body from my understanding, then moving subjects shall be avoided. I did not try it yet.

Laurent Venet wrote:

xpatUSA wrote:

DMillier wrote:

My Kodak 14n has a ISO 6 mode and complicated things happen with that. It is a computational mode, the camera takes multiple shots including dark frames and blends them all together magically to produce ISO 6.

Now that makes sense, Dave, thanks!

No idea whether this is of the slightest relevance!

So maybe the Sigma/Sony has trickery after all ...

FP-L does the same way of multi shot to assemble them in camera body from my understanding, then moving subjects shall be avoided. I did not try it yet.

Yes I believe this is the actual case.

In my test shot the water is moving, and that's where the odd artifacts appear.  But these are also near or part of overexposed areas.

I need to do a few more to explore this further.  For example I don't yet know what will happen when I have an "exposure" that has no parts that are saturated.

I think ISO 6 still has very good potential for this type of shot as well as maybe some street photo art as well.

Laurent Venet wrote:

xpatUSA wrote:

DMillier wrote:

My Kodak 14n has a ISO 6 mode and complicated things happen with that. It is a computational mode, the camera takes multiple shots including dark frames and blends them all together magically to produce ISO 6.

Now that makes sense, Dave, thanks!

No idea whether this is of the slightest relevance!

So maybe the Sigma/Sony has trickery after all ...

[fp L] does the same way of multi shot to assemble them in camera body from my understanding, then moving subjects shall be avoided.

Thank you. Is there a link to where it says that?

From the Sigma website downloaded manual for the fp L:

Multiple images combined to give impression of low ISO?

An alternative method is to shoot a few images in a burst, at any ISO setting. Affinity Photo does a good job of stacking them.

This allows you to select some or all of the set.

Don

Tom Schum wrote:

From the Sigma website downloaded manual for the fp L:

Multiple images combined to give impression of low ISO?

Sounds like it, Tom, but my understanding of Japanglish is none too good.

xpatUSA wrote:

Tom Schum wrote:

From the Sigma website downloaded manual for the fp L:

Multiple images combined to give impression of low ISO?

Sounds like it, Tom, but my understanding of Japanglish is none too good.

Me, too.  There is something of a language barrier here!

xpatUSA wrote:

Laurent Venet wrote:

xpatUSA wrote:

DMillier wrote:

My Kodak 14n has a ISO 6 mode and complicated things happen with that. It is a computational mode, the camera takes multiple shots including dark frames and blends them all together magically to produce ISO 6.

Now that makes sense, Dave, thanks!

No idea whether this is of the slightest relevance!

So maybe the Sigma/Sony has trickery after all ...

[fp L] does the same way of multi shot to assemble them in camera body from my understanding, then moving subjects shall be avoided.

Thank you. Is there a link to where it says that?

I just had a quick check at the online user manual :

User manual page 67

from page 67 :

COMPOSITE LOW ISO EXPANSION (STILL) This function allows you to take multiple images at one time, produce the same status as the automatic synthesis or low sensitivity shooting, and shoot photographs with rich gradation and noises reduced.

cheers

btw, I wonder if auto focus bracketing does the same, it would be awesome for macro, so many things to play with

Laurent Venet wrote:

btw, I wonder if auto focus bracketing does the same, it would be awesome for macro, so many things to play with

It might be a problem if the lens has focus breathing:  if image size varies as focus is varied.  Most lenses have at least a little focus breathing.

DPR video lens reviews are starting to discuss focus breathing in depth now.  It's very interesting too!

I guess focus stacking software deals with all this.  I don't know.

Laurent Venet wrote:

xpatUSA wrote:

Laurent Venet wrote:

xpatUSA wrote:

DMillier wrote:

My Kodak 14n has a ISO 6 mode and complicated things happen with that. It is a computational mode, the camera takes multiple shots including dark frames and blends them all together magically to produce ISO 6.

Now that makes sense, Dave, thanks!

No idea whether this is of the slightest relevance!

So maybe the Sigma/Sony has trickery after all ...

[fp L] does the same way of multi shot to assemble them in camera body from my understanding, then moving subjects shall be avoided.

Thank you. Is there a link to where it says that?

I just had a quick check at the online user manual :

User manual page 67

from page 67 :

COMPOSITE LOW ISO EXPANSION (STILL) This function allows you to take multiple images at one time, produce the same status as the automatic synthesis or low sensitivity shooting, and shoot photographs with rich gradation and noises reduced.

Tom Schum already posted the same information a day ago.

https://www.dpreview.com/forums/post/65541267

Made little sense to either of us.

The exposure is good here (no blatant overexposed areas) but there are artifacts in the nearest white water. I think these artifacts come from the computational multiple exposure method used to emulate ISO 6. Still, it is quite pleasing I think.

DNG is processed in SPP, then downsized using FastStone Image Viewer 7.5.

Lens is Leitz Elmar 1:4/135mm (Leica M mount using Fotodiox adapter for fp L), at maybe F8 or so. Downsized to 24mp:

16mb download for 24mp image

There are other settings for ISO that use the same computational multi-exposure method. ISO 50 is the highest ISO in the fp L using this method. An ISO 50 shot processes much quicker than an ISO 6 shot and also looks quite good.

Here is the ISO 50 version.  This is the highest ISO available in the fp L using multi-exposure computational mode.

17.8 mb download for 24mp image.  Bubbles are seen in the nearest white water, but not in ISO 6 shot.

ripleysbaby wrote:

iso 6 is fantastic for taking photos of a line of flying ducks when there is only 1 duck 😂

I'd love to see a sample of this!