Linked Questions

7 votes
3 answers
1k views

What is it called when aperture and exposure are previewed on the LCD screen before the shot is taken?

I have a Canon PowerShot SX120 IS. I would like to get a better comparable camera, but the singular feature I love the most about this camera is when in Manual mode, I scroll through shutter speed ...
Jason's user avatar
  • 71
1 vote
3 answers
2k views

How is the F stop number derived?

How are F Stop numbers derived? I have both a Canon 50d and a Panasonic DMC-LZ8k, a compact with full manual mode. When I set all settings but shutter speed identically between cameras, I end up with ...
Evan Pak's user avatar
  • 1,272
32 votes
2 answers
27k views

What is T-number / T-stop?

Usually, when discussing aperture of a lens, F-stop and F-number are used for quantifying. But some photographers, and especially videographers, also mention T-stop. The concept and numbering used (e....
Imre's user avatar
  • 32k
13 votes
2 answers
622 views

Does focus breathing make a lens slower when close focusing?

I've heard that focal length of some lenses will become noticeably longer when focusing to a close distance, an effect called "focus breathing". Since f-number is focal length divided by diameter of ...
Imre's user avatar
  • 32k
6 votes
2 answers
1k views

What's the base f-stop when counting an ideal f-stop for lens?

I've read a lot around this site that an ideal quality of the lens is achieved when using f-stop roughly 2 stops slower than the fastest value of the lens. Firstly, I'm not exactly sure what "2 stops"...
Frantisek's user avatar
  • 2,683
5 votes
2 answers
343 views

How do dedicated light meters account for light transmittance?

Dedicated light meters seem to be well-regarded for their versatility and accuracy of metering. What puzzles me about them is how can they account for the different light transmittance of different ...
Imre's user avatar
  • 32k
0 votes
2 answers
13k views

How is f-stop a measure of dynamic range?

As far as I have read f-stop is a measure of the aperture. This affects the amount of area in the foreground and background which is in focus. While having a look at the dynamic ranges of cameras I ...
jinkx's user avatar
  • 103
0 votes
2 answers
500 views

True or False: A two full F/stop change to either side of the starting F/stop will either double or half the amount of light from the original F/stop

Explain. A two full F/stop change to either side of the starting F/stop will either double or half the amount of light from the original F/stop.
user avatar
-1 votes
2 answers
2k views

What F means in lenses and how to find focus distance [duplicate]

I've found some camera sensors with very low resolution to use with electronics. Camera have 150x150px and can mount different lenses type: F2.7, F4.0, F6.0. I want to ask what F means and if I can ...
Singee's user avatar
  • 101
2 votes
1 answer
15k views

calculating aperture and shutter speed inversion [duplicate]

I'm taking a manual photography class, using my canon rebel t5. Any tips on how to calculate aperture and shutter speeds easily? (I know they have to be inverted). After I meter my photo (set at -0-)....
AngBrammer's user avatar
2 votes
1 answer
273 views

How can I set up an off camera flash using the reading from the light meter?

I want to be able to blend ambient light with fill in flash, using off camera flash in manual mode. I don't understand how to translate the information from the light meter into settings to input into ...
Andy's user avatar
  • 53
1 vote
1 answer
292 views

Where can I find tables of common shutter speed and aperture values? [duplicate]

I'm working on image processing software (mind that I'm a programmer and when talking about photography, I'm "tabula almost rasa"). In this software, I'm using a RAW decoder that returns a data ...
mishan's user avatar
  • 252
0 votes
1 answer
455 views

Convert leica-m to c mount? Ideal lens for low light photography?

We are using a scientific camera which has c mount. We are dealing with very low light conditions so we are going to need to use a fast lens with large aperture. The Leica Noctilux-M 50mm f/0.95 seems ...
Adam's user avatar
  • 101
-1 votes
1 answer
3k views

What does the F number in a lens name mean? [duplicate]

Possible Duplicate: What does the f-stop printed on the lens refer to? I understand that for a DSLR you can modify the aperture(the F number) to allow more or less light to enter the camera. But ...
Ryan's user avatar
  • 151
-2 votes
1 answer
5k views

How does aperture affect exposure? [duplicate]

I've heard that aperture can change the exposure, but I would like to know if this is true, and how it does it. P.S. I hope this question isn't dumb like my last two.
J. Walker's user avatar
  • 1,201

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