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Skelwith Force , Cumbria Uk

By Chris_Ev
Ok, I'm still learning, and I still don't understand what F stops do, but this are my 2nd attempt out with the camera, I admit I became obsessed with using my ND filters to get a longer exposure to get the water to blur, but was advised less than a second was needed, please feel free to critique as I'm getting frustrated now with how my camera works.

Tags: Landscape and travel

Voters: Alda, Trev_B, morpheus1955 and 2 more

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Trev_B 11 151 68 England
19 Dec 2012 9:36AM
Hi Chris... it's important to understand the connection between aperture (f stop), shutter speed and ISO as they are linked and each effect the exposure and overall effect of the shot. The f stop simply put is the size of the lens aperture, a high f number is a small hole for the light to pass through and a small number a larger hole. Use this sites search engine to look for understanding f stops as there is plenty of info out there.

Another point to be aware is that your image is not straight, the far river bank is sloping to the left.

Hope this helps, I am sure others will give you advice about shutter duration for this type of shot.


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Trev_B 11 151 68 England
19 Dec 2012 9:39AM
I forgot to mention, try putting your images in the critique section as you will get some genuine help from the talented critique team.
19 Dec 2012 10:29AM
Thanks Trev, So in bright sunlight do i need a high F stop so as not to let too much light in, and vice versa if its dark/cloudy ?
Trev_B 11 151 68 England
19 Dec 2012 11:02AM
Thats the general idea, on a bright day you could also use a faster shutter speed to reduce the length of time light is exposed to the camera sensor or a lower ISO number so as to make the sensor less sensitive.

You need to ask yourself how much of the image do you want in focus, all or just the subject. The size of your f stop will dictate this, a small f stop will give a narrow Depth Of Field or DOF.

If you want to freeze the action a fast shutter speed will be required as slower speed will tend to blur moving objects in the image.

The ISO sets the sensitivity of the sensor, a low value needs more light whether from a wide aperture or slow shutter speed to operate. In low light situations you can use a higher ISO setting to get a better exposure. however raising the ISO increases the chance of noise and the more expensive cameras tend to handle higher ISO values better. Generally the lower the ISO the batter the quality of the image.

It's allot to take in just remember they are all linked... change one and it will effect the others.

19 Dec 2012 12:08PM
Thanks again Trev, I'm really struggling, especially understanding what the differant letters mean on the dial, ie AV TV & P, I know what M is lol, I get frustrated though as I never know what to set the camera on. I like waterfalls at the minute as I like the blurred effect so I've sort of sussed those ones (ish) So I suppose for waterfalls i need shutter priority as I want the camera to do a long exposure for the water to be blurred, but I don't know which letters on the dial to set it to to get shutter priority....Could you or someone else just give me a 30 second breakdown of what the letters mean and under which circumstances I'd use them ie

AV =

TV =

P =

Hope someone can help as I'm really fed up now :-(
Trev_B 11 151 68 England
19 Dec 2012 1:00PM
Keep your chin up Chris.
Although I am a Nikon user and the labels are different the functions are the same.

AV= Aperture Priority..... you set the F stop and the camera meters the image and selects a shutter speed based on the ISO you have the camera set to.

TV= Shutter priority... as above but you set the shutter speed and the camera deals with the f stop.

P= Program mode... the camera is king and it selects the F stop and shutter speed to get the optimal exposure.

My advice to you is to keep it simple, do as most of us and keep the camera in AV mode and change the f stop to give you the required DOF. Remember by reducing the size of the aperture will force the camera to slow the shutter speed so you still have control of the shutter speed and if this does not give you the required aperture/shutter speed combination you want change the ISO.

The best way to understand this is to select AV, choose an f stop take an photo and note the F stop, shutter speed and ISO. Then change the F stop take the same shot again and see how the shutter speed has changed. Now without changing the f stop change the ISO value, taking the same shot again you will see that it changes the shutter speed. Most of all all three shots will, or should, be correctly exposed.

20 Dec 2012 8:51AM
Thanks Trev you're a star Grin

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