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It depends on what you are shooing in which condition. To your question, there is no such standard that you need to set you aperture first then shutter speed or ISO.
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Here I couldn’t compromise my shutter speed or aperture, so I knew I needed to use the third player in the exposure triangle–the ISO. Sadly ? picture was way too dark and I could hardly see Rohino on my LCD. I knew that fast shutter speed would prevent any motion blur from the rhino running on a grass side. And then, I fired my shutter and picture got displayed on LCD. I wanted to capture action in the photo, So that’s why I needed shutter to open for a fraction of second so that images should not come out blurred, so I set my camera to 1/500th of a second. This makes the perfect Rhino shot with subject shapely in focus and everything else is beautifully blurred. This will also impact the depth-of field (blur effect) to blur out the stones behind the triple-horned rhino. So I set my aperture to f/4 to gather as much light as possible. To compensate this darkness, I had to keep my camera setting with maximum aperture, my lens had a maximum aperture size of f/4. The early hour and clouded sky made the situation quite dark for shooting. Around 9AM on a cloudy day, I found a small group of triple-horned rhino and started photographing them with a long 300mm Tamron lens.
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I was being informed that the triple-horned rhino in the park are extremely rare, so I worked hard that week to capture images of the last few rhino left in that area of the park. I was on a trip to my favorite place on the planet to take pictures. With the help of this small story, I am trying to explain the scenario and how/when to control all three different aspects of Exposure Triangle …….