Just to confirm about stop

[riz]

Hello,

 

Just want to confirm that adding stop means change in aperture and shutter

speed or ONLY aperture value?

 

Take care and regards,

 

Rizwan

[tonybeach]

A stop can refer to anything that changes the EV; such as ISO sensitivity, pulling or pushing development, or flash output as well as shutter speed or aperture. If you say "f/stop" or "stopping down" though then you are referring to the aperture.

[mohir_ali]

Adding a stop usually means 'adding' more light, ie, opening up the aperature by one stop (2 from 2.8) OR slowing the speed reciprocal half (1/60 from 1/125). Subtracting means the opposite.

[riz]

Thanks. One favor needed.

 

Please visit the site:

 

http://www.photokaboom.com/photography/learn/tips/054a_exposure_sunny_16.htm

 

In column of Exposure in the table there is mentioned that Add 4 stops, Add 1 stop etc. Does that only refers to change in the aperture?

[mohir_ali]

No, either opening aper., slowing the speed, or both.

[riz]

Thanks Mohir one confirmation:

 

If I add 1 stop:

 

I went to f11 from f16. Do I must need to adjust the shutter speed accordingly or its optional?

[mohir_ali]

http://www.photo.net/learn/making-photographs/

[colin carron]

What the Sunny 16 table mens is

 

-----------------------------------------------------------------

 

For Sunny conditions (shadows have hard edges) set

 

Shutter: Reciprocal of the ISO (say 1/200) and Lens opening: f/16

 

But when it is lightly overcast (shadows have fuzzy edges) with thin cloud

 

Shutter: Reciprocal of the ISO (say 1/200) and Lens opening: f/11

 

But when it is overcast with thick cloud (shadows barely visible)

 

Shutter: Reciprocal of the ISO (say 1/200) and Lens opening: f/8

 

-----------------------------------------------------------------

 

Now as mentioned above instead of changing the aperture to 'add 1 stop' you could instead change the shutter speed. The table would then look like this :

 

 

-----------------------------------------------------------------

 

For Sunny conditions (shadows have hard edges) set

 

Shutter: Reciprocal of the ISO (say 1/200) and Lens opening: f/16

 

But when it is lightly overcast (shadows have fuzzy edges) with thin cloud

 

Shutter: Reciprocal of the ISO (say 1/100) and Lens opening: f/16

 

But when it is overcast with thick cloud (shadows barely visible)

 

Shutter: Reciprocal of the ISO (say 1/50) and Lens opening: f/16

 

-----------------------------------------------------------------

 

god luck!

[mrstubbs]

"I went to f11 from f16. Do I must need to adjust the shutter speed accordingly or its optional?"

 

In context with your question Rizwan. NO!

 

Each stop wider (a lower f. number) equals "two times"(200percent) as much light being recorded.

 

Each stop smaller (a higher f. number) equals "half"(50percent) as much light recorded.

 

So..."to double the amount of light"...you can open wider by one stop..eg f16 to f11 ..OR... half the speed eg 1/250th to 1/125th.

 

And to ..."half the amount of light"...you can close down by one stop eg f11 to f16 ...OR... double the speed eg 1/125th to 1/250th.

[alex_lofquist]

If you're a Brit a "full stop" is the end of a sentence! ("Period" is not generally approved in polite circles.)

[colin carron]

Alex, 'Period' will do fine for 'full stop' where I am in UK. Maybe I move in impolite circles :-)

[cabbiinc]

Just to clarify on what Colin said "Shutter: Reciprocal of the ISO (say 1/200)" means that at ISO 200 you would shoot at 1/200th of a second. At ISO 100 you would shoot at 1/100, ISO 400 = 1/400th etc...

 

Match your ISO or get close to it.

 

You can also adjust the ISO by stops as well. ISO 100 is one stop slower than ISO 200, is one stop slower than 400... Double the ISO and you have moved one stop.