Help with my photography questions?

[tashhhalicious]

1- with the lower the shutter speed the more light is allowed in the image, so if you have a bright lit area with a low shutter speed ur photo is most commonly going to be just white, another is you reduce the risk of camera shake.
2- f4&f8 are aperture i am pretty sure so that the lower your aperture the is the more light rays you receive in your image which means that your image in turn would be more clear. for example, with those photos wher eyou see only the subject is in focus, that means that they have a higher aperture.
125SS to 250SS, shutter spead determines how long its exposed for (250 means one- two hundred and fifty-eth of a second), so for a light area you wuold use a higher SS as you dont need much more light in it as your surroundings are light, where as in a dark space you need a lower SS so as much light can be taken in and your image wont just be black
F4&125SS against F5.6&500SS, with ur aperture at 5.6 and ss at 500 your would need you area to be reasonably well lit, i.e outside when its sunny cause not much light is being taken into the image. wher as the other one you would use also outside but on an overcast day wehre its not as light
3- ohkays for this it really depends on how poorly lit the alley is, but no matter what you will need your shutter speed quite low, though if you find that your images are constantly blury it means that cause the alley is so dark the shutterspead is so low that you have camera shake in which case you would need a tripod.

 

[Bob]

1. What two problems does one face from low shutter sppeds (less than 1/60 sec)?. How might one compensate for this?

2.Compare the amount of light entering the camera on the following pairs of settings
- f4 and f8
- 125 and 250 shutter speeds
f4 and 250 against f5.6 and 500

3. if you had to photograph a large mural in a poorly lit narrow alle, how would you be able to do this?

Any answers to any of the question would be great.
Thanks

 

[Mr Din]

1 - motion blur. bellow 1/60, holding your camera with your hands is not fast enough to avoid motion blur in the resulting picture. the ways to compensate this are either (or a mix of):
- increase ISO to reduce exposure time
- increase aperture to reduce exposure time
- use a stand to avoid vibrations (use timer or remote trigger)
- adopt a position that reduces the body motion (holding your elbows stuck to your body, lying against a wall or anything else that won't move)
the second issue I believe will be still motion blur, but on the subject side now... if the subject is still, that should not be a problem, if it is for a portrait, ask your model to stand still while you take the picture. If you're trying to shot a group picture or kids... well, better forget it!!

2 - f4 and f8 - you'll have 4 times less light hitting the sensor at f8 than at f4 because you have 2 f-stops in between (each f-stop divides the light quantity by 2) - the missing f-stop in between is 5.6
- between 125 and 250, you'll have half the light at 1/250 than at 1/125
- f4 and 250 against f5.6 and 500 - rather simple, between f4 and f5.6, you have one f-stop. between 1/250 and 1/500, you have 1 f-stop. so between the two settings, you have 2 f-stops = at f5.6 / 1/500, 4 times less light hits the sensor

3 - use a wide angle lens to capture the largest part of the mural. use a stand to avoid motion blur (with timer or remote trigger to avoid motion when pressing the shutter release). don't use a flash at it will show poor result used with a wide angle lens. select aperture priority mode, around f8 to benefit from the best optical equation, let it compute the exposure time and shoot