Things You Have To Know Concerning GoPro HD Helmet Hero

There is really only one perfect exposure to any kind of photo: the one that looks good to your eyes. However, your camera photometer plays an enormous role in letting you get a starting place for your image.

The fact is that cameras have not changed much in 20 years. However, the GoPro HD Helmet Hero has set the stage here. Still, an exposed image Is the one that combines the correct amount of light that hits your film (or digital sensor) based on your current ISO.

You can get a wide selection of f-stops and shutter speed mixtures, but only one of those combinations will make an exposed image. Using one f-stop or shutter speed over another changes either depth of field or freezes the action.

This brings up the question: "What's the difference between shooting the photo utilizing f/22 or f/2.8?" The response is depth of field. The greater the number, the more depth of field you are going to get in your photo, however at the same time, you are compromising speed. Although the number is larger and you get more depth of field, your lens is actually closing and letting less light in. This necessitates a longer exposure or longer shutter speed.

Whenever should you utilize just one setting over the other? It depends of what you are trying to achieve in your photo and how quick your subject Is moving. All of the combinations above will give you an exposed photo, but, if you are shooting a fast moving fish and you choose f/22, then most probably you are going to end up with a blurry fish. Accordingly, if you are shooting a swift moving fish and choose f/2.8, then you are going to have virtually no depth of field.

Your distance to your subject is going to play a huge role in depth of field as well. If you are very close to your subject (as you should be underwater), there will be a significant effect on depth of field than when you are further away. As a rule of thumb, if your lens Is focusing to infinity when you are targeting a subject, you actually don't need to worry about depth of field.

If you are close to the subject (eg: underwater), then you must make compromises:

More depth of field required: go with a higher f-stop.

Less depth of field required: go with a lower f-stop.

Fast moving fish: go with a lower f-stop (faster shutter speed).

Slow moving fish or stable objects: go with a bigger f-stop (slower shutter speed).

If you are using strobes (as most of us do underwater), then you have more options since you can adjust their intensity to satisfy your lighting needs.

As an example With My GoPro HD Helmet Hero Review:

Envision I'm diving at 40 feet. I measure the green water and it gives me f/8 at 1/125th. I would start by shooting at that, and then:

In the event that I'm happy with the depth of field but would like more ambient light (lighter background), then I would leave my selected f-stop and decrease my shutter speed until I get the ambient light I wanted.

In the event that I'm happy with the depth of field however I would like a darker background, consequently I would increase my shutter speed and increase the maximum flash sync speed of the camera.

Lastly, keep in mind that if you are shooting with strobes utilizing the GoPro HD Hero, you are going to be limited by your strobe's sync speed. The reality is that when we are underwater, we always deal with loss of light starting at very shallow depths, so this last point is not actually a problem in 99.99% of the cases.

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