Is it possible to turn a non-constant aperture lens, into a constant aperture? (Sony, camera)
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For a movie project I am planning everything for, for some shots, I want to do zooms during the shooting. However, the zoom lens I have is not a constant aperture one, since those ones are much more costly.
But even if I keep the lens at the same aperture, say f8, while zooming the whole zoom, it still readjusts during the zoom, even if it's f8 the whole time.
Here is a zoom example I did on someone. You can see the aperture change, even though it's the same aperture the whole time according to the camera. Any thoughts on how to change this?
Okay thanks. I was using a Canon T2i, and a Canon 70-300mm EF lens.
For the project I want to do, most DPs where I live use the Sony A7s, but do not have telephoto lenses. So if we mount mine on a Sony, the aperture remains the same throughout the zoom, I've noticed.
However, you cannot change the aperture when mounting that lens to a Sony it seems. So what is the best workaround, if any?
The short answer would be to rent a better lens. If you have a camera or video shop that does so in your city, it's not terribly expensive unless you're after one of the phenomenally expensive sports telephotos or ultra-low-light f1 stuff.
Okay thanks, but the stores only have prime lenses to rent and none of them are zooms. That is why I bought this zoom, but didn't notice the aperture changing problem till later on.
It only cost $700. There is one solution I thought of and tried out and it worked so far. Basically if you put an adapter between the lens and the camera, the aperture stays the same because the lens and the camera are not communicating with each other, and the camera does not change the aperture as it zooms in.
However, there is a major problem with this though, is how do I change the aperture, if there is an adapter in between the camera body and the lens?
Not sure. The basic problem here is that you're trying to do sophisticated work with consumer gear. That's the real divide between consumer and pro: both will take amazing pictures these days, but consumer gear will only do it within a narrow range.
Well I see what you mean, but I was told that most filmmakers have to work with what they have, so how does one do that then, if coming up with DIY options to control the technology is not an option?
Well technique B would be to get a gimbal so I can do push ins and push outs, instead of zooming. That way I won't have to worry about aperture changing problems. However, the reason why I got the zoom lens was so I wouldn't need to get a gimbal necessarily. So I feel getting the lens was moot now, if it turns out that a gimbal would have done the job without as many problems, in comparison.
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