Exposure Arithmetic card: For those who like to calculate exposures but like me cannot remember the numbers, might find the attached table of some use. I issued copies to the Photo...

Searcher Loc: Kent, England

For those who like to calculate exposures but like me cannot remember the numbers, might find the attached table of some use. I issued copies to the Photo class I teach and it went down very well.

If you shooting with the "sunny Sixteen rule" f/16, 1/100 sec. ISO 100, but would prefer to open the aperture to f/5 for whatever reason, you would need to speed up the shutter appropriately.

f/16 to f/5 is 10 x 1/3rd stops
so count down the shutter speed table 10 x 1/3rd stops:

1/100, 1/125, 1/160, 1/200, 1/250, 1/350, 1/400, 1/500, 1/640, 1/800, 1/1000

The card when downloaded is 7" x 5"

Exposure Arithmetic Card

(Download)

Michael Christy

Cool. Thanks

Joecosentino Loc: Whitesboro, New York

Another thank you. It's always nice to get information compressed into an easy to use format.

So question, I have been shooting for a long time, recently I have been thinking changing my settings to at least 1/2 stops instead of thirds, I may even go to full stops only. Shooting manual I am thinking in most situations the 1/2 stop is more then enough control over exposure. I would like to hear what others think

John_F Loc: Minneapolis, MN

Quite a few years ago, I had a card with two rotatable round overlays that had windows and numbers around the perimeters. When film speed was set in one window and a light level number set in another, all combinations of exposure f-stop and shutter speed were lined up. Wouldn't that do the same as the cited table.

Searcher Loc: Kent, England

John_F wrote:

Quite a few years ago, I had a card with two rotatable round overlays that had windows and numbers around the perimeters. When film speed was set in one window and a light level number set in another, all combinations of exposure f-stop and shutter speed were lined up. Wouldn't that do the same as the cited table.

Exposure wheels are still available although smart phone apps have taken over somewhat.

I could easily design one, but the problem of construction and durability makes it not worth while.

A side rule style calculator would be easier to make, but would only be of use for shutter speed and Aperture, leaving ISO out on a limb.

The reason my class likes the table is because they have to count off the numbers and slowly (ever so slowly) they begin to remember them.

rpavich Loc: West Virginia

Joecosentino wrote:

Another thank you. It's always nice to get information compressed into an easy to use format.

So question, I have been shooting for a long time, recently I have been thinking changing my settings to at least 1/2 stops instead of thirds, I may even go to full stops only. Shooting manual I am thinking in most situations the 1/2 stop is more then enough control over exposure. I would like to hear what others think

I shoot all manually, always have and I just use full stops.

I think it's a waste to try and memorize 1/3 stops for the purpose of setting your camera.

Searcher Loc: Kent, England

rpavich wrote:

I shoot all manually, always have and I just use full stops.

I think it's a waste to try and memorize 1/3 stops for the purpose of setting your camera.

I am not aiming at memory exactly, but awareness. As I teach novices, I want them to know the whole stops and be aware of the thirds and their relationship to the wholes. The more they use them, the more awareness there is.

rpavich Loc: West Virginia

Searcher wrote:

I am not aiming at memory exactly, but awareness. As I teach novices, I want them to know the whole stops and be aware of the thirds and their relationship to the wholes. The more they use them, the more awareness there is.

True..it's good for that.

Quick! what's 2/3 stop more than f/7.1!

:)

Nikonista Loc: England

Searcher wrote:

I am not aiming at memory exactly, but awareness. As I teach novices, I want them to know the whole stops and be aware of the thirds and their relationship to the wholes. The more they use them, the more awareness there is.

I think you and I would all this 'Underpinning Knowledge' - not sure in the States. In that, it is totally valid but in a practical sense as rpavich says. I cannot remember a shot that was made (or ruined) by a fractional stop.

lightcatcher Loc: Farmington, NM (4 corners)

Searcher wrote:

For those who like to calculate exposures but like... (show quote)

Thank you Searcher

:thumbup: :thumbup: :thumbup: :thumbup:

jerryc41 Loc: Catskill Mts of NY

Searcher wrote:

The card when downloaded is 7" x 5"

When I click on Download, I get a blank white screen.

dpullum Loc: Tampa Florida

Searcher... well do you not realize that it is all built into the camera's auto setting!? Artillery men do not use trajectory tables, they set the aim on auto. Auto bracket for both exposure and also auto bracket for white balance. Yep from canon manual.. color bracketing... !

We can still rely on that sheet that came in the film pack... still valid today... won't go too far wrong. Thank you searcher for the table.

Jerry, right click ... open new tab... give that a try.

Searcher Loc: Kent, England

jerryc41 wrote:

When I click on Download, I get a blank white screen.

If on Windows, Control + "-" (without inverted commas) to reduce screen image size, or hold control whilst spinning the mouse wheel. If on a Mac - I don't know**. I think it is an overly enlarged screen so you are seeing the borders of the image.

** Would that be Command + "-" ?

jerryc41 Loc: Catskill Mts of NY

Searcher wrote:

If on Windows, Control + "-" (without inverted commas) to reduce screen image size, or hold control whilst spinning the mouse wheel. If on a Mac - I don't know**. I think it is an overly enlarged screen so you are seeing the borders of the image.

** Would that be Command + "-" ?

Thanks. Got it.

Searcher Loc: Kent, England

dpullum wrote:

Searcher... well do you not realize that it is all built into the camera's auto setting!? Artillery men do not use trajectory tables, they set the aim on auto. Auto bracket for both exposure and also auto bracket for white balance. Yep from canon manual.. color bracketing... !

We can still rely on that sheet that came in the film pack... still valid today... won't go too far wrong. Thank you searcher for the table.

I taught Auto settings in lesson one, Set Auto, squeeze the shutter, lesson over.

My experience of Artillery shooting is limited to watching documentaries on television, however I did watch a programme on how these guys are trained for Royal Navy; the students actually had to compile trajectory tables and much more.

My students will learn how to use their cameras, what the buttons do, what the menus are for, how exposure and focussing works etc., then they can move on and learn the art of composing from someone else. (I do basic technical stuff - not the artistic.)