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This weekly course covers the most common questions videographers encounter when shooting and editing with DSLR cameras, from choosing a frame size and frame rate to understanding moiré. Authors Rich Harrington and Robbie Carman will also help you understand the impacts of compression and the difference between cropped (or micro 4/3rds) and full-sized sensors in cameras, and much more. This continual FAQ guide is a handy way to find the answers to the questions that plague you the most.
Robbie Carman: Hi there, I am Robbie Carman. Rich Harrington: And I am Richard Harrington. Robbie: And Rich, this week we are going to talk about something that we get asked about a lot and that is, why when I zoom in on something does my exposure seem to change? Rich: Gremlins. Robbie: Yeah, that must be what it is, must be what it is, bring the camera back. Rich: Yeah, actually people have returned their cameras over this, like it doesn't work, I zoom in and the shot changes. Remember, when we are shooting video, we are typically shooting manually, and we are balancing out that exposure triangle, which we have talked about before. I am going to review here in just a second, but what can happen is, is as you zoom the lens to change your composition, you can visibly notice the shot getting lighter or darker.
Robbie: Yeah, that's right, and that's because not all lenses are created equal. Typically, when you buy a very expensive lens, like a prime lens or a high-end zoom, you are going to have a continuous aperture or f-stop through the entire zoom range. However, a lot of the kit lenses that you get that come with these cameras, the reason that they are relatively cheap is because it's less expensive to make a lens that has a variable f-stop or a variable exposure throughout that zoom range. So as you zoom in, typically, you are going to get darker.
Rich: So, now that you understand the root of the problem, when we come back, we are going to talk all about understanding f-stop and making sure you know what type of lens you're using, so you can avoid this problem.
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