A Question about Stops

[DanK]

I don’t have a 6D, but it has been possible to set iso for half stops on my Canon bodies. I currently have a 7 D and a 5D III, and bother are set that way.


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[xpatUSA]

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I have a (physical) chart of the "typical" colours which are to be found in typical scenes. I think it is a Kodak Publication.

I will attempt to find it when I arrive back home.

Looking forward to that, Bill. Kodak pubs seem hard to find these days and links in the Literature are oten no good (pub taken off-line).

[Rufus]

As far as I can tell my Canon 6D Mk2 has an option for 1/3 or 1/2 stop exposure increments for aperture and shutter speed, but retains 1/3 stop increments for ISO. That seems inconsistent to me.

1/2 stops make calculations easier, but 1/3 stops all round makes counting clicks easier.

My default is to select 1/2 stops and then only change from ISO 100 if I have to, in which case it does not matter whether incremental ISO steps are 1/3 or 1/2 a stop.

I have just found out where to change the incremental ISO steps. There are two options: 1/3 of a stop or a full stop. So still no 1/2 stop available, which seems strange.

Meanwhile I have changed my default ISO increment to a full stop to see if it proves, in practice, to be too large an increment.

[xpatUSA]

Meanwhile I have changed my default ISO increment to a full stop to see if it proves, in practice, to be too large an increment.

Shouldn't be problematic, in my experience, David. All my cameras are set to full-step ISO increments. 1/3 is not even available on some of them.

But I always shoot at native ISO and if I run out of acceptable shutter speed, I walk away. Being retired, I can do that ...

Please let us know how you get on.

[William W]

I don’t have a 6D, but it has been possible to set iso for half stops on my Canon bodies. I currently have a 7 D and a 5D III, and bother are set that way. . .

Please check Dan, I think this is incorrect, or, you have found a way around it which I would like to know how to do.

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I have just found out where to change the incremental ISO steps. There are two options: 1/3 of a stop or a full stop. So still no 1/2 stop available . . .

I think this is the standard on all EOS Series Cameras.

Typically using the first two Custom Functions:
> CF1-1 is “Exposure” increments, which can be set to ½ or ⅓ Stop
> CF1-2 is (exclusive) ISO increments which can be set to ⅓ or 1 Stop.

WW

[DanK]

sorry, my mistake. 1 stop or 1/3. I have always left it at 1 stop intervals as I can't see much value in changing ISO by 1/3 stop, and the arithmetic is simpler if one sticks with whole and half stops

Please check Dan, I think this is incorrect, or, you have found a way around it which I would like to know how to do.

***



I think this is the standard on all EOS Series Cameras.

Typically using the first two Custom Functions:
> CF1-1 is “Exposure” increments, which can be set to ½ or ⅓ Stop
> CF1-2 is (exclusive) ISO increments which can be set to ⅓ or 1 Stop.

WW

[William W]

Originally Posted by William W -
I have a (physical) chart of the "typical" colours which are to be found in typical scenes. I think it is a Kodak Publication.
I will attempt to find it when I arrive back home.

Looking forward to that, Bill. Kodak pubs seem hard to find these days and links in the Literature are oten no good (pub taken off-line).

Hello.

I cannot find that exact chart/publication. It probably is in "storage".

In its place I found this delight, which from memory predates the publication which I cannot locate.

I hope this will suffice and if not, at the least be entertaining, of itself.

I particularly appreciate that 'Lemons' are listed as one of the 'Commonly Photographed Subjects in the Sun' - when in doubt of the exposure to use, just grab a lemon.

I also appreciate Kodak's use of Capital Letters for (what they consider) are: 'Proper Nouns'.


(Eastman Kodak Company, 1975, p13)

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Here is additional (confusion?) to the topic of the history of measuring in ⅓Stop vs. ½Stop –

In the 1975 publication, [op cit], the Filter Factors for Color Correction Filters; Filter Factors for B&W Contrast Filters; ASA Film Speeds; and Lighting Ratios are all documented in THIRD STOPS

Yet, Film Reciprocity Corrections (in Stops) are listed in both THIRD and HALF Stops (that’s arguably logical and also useful)

And, Lens Opening Dials (Apertures); Metering Correction tables are all in HALF STOP increments.

Sample here of the CC Filter Dial –


(op cit, p17)

***

Additionally, I thought this was 'cute' in its description of what is now commonly termed "TTL Metering"


(op cit, p12)

WW

All Images © AJ Group Pty Ltd Aust 1996~2020 WMW 1965~1996
Content copyright Eastman Kodak Company New York, USA. Reproduced here for educational purposes.

Reference: Eastman Kodak Company, 1975, Kodak Profesional Photoguide, 1st Edition, First Printing, Publication No. R-28, Catalogue #104 2282 Eastman Kodak Company, New York

[Manfred M]

I particularly appreciate that 'Lemons' are listed as one of the 'Commonly Photographed Subjects in the Sun' - when in doubt of the exposure to use, just grab a lemon.

I don't understand. There are places in the world where we might need to meter lemons....





We used to buy our lemons from this lady while my daughter lived in Bangalore, India. My wife spent about 6 months there over 3 years, while I managed about 3-1/2 months over a couple of years. I did notice a difference when metering the yellow ones versus the green ones...