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Showing results for tags 'STF'.
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I've just had an idea and I want to share with you. Since I'm interested in STF effect, I want to find a way to mimic it without using APD filter. Basically, to achieve the same effect, I have to block the light gradually from center to the edge of the iris. It can be done easily with APD filter, but what if I don't have that filter? Well, the aperture blades can do the same thing if they're allowed to close or open DURING the course of exposure (in normal way, the iris is closed or wide opened before the exposure). To demonstrate that, I used Helios 44 58mm f/2 with 13 aperture blades, so that the bokeh will be almost rounded at every apertures. I set the shutter speed to be quite slow, but not to slow to prevent shaking when I turned the aperture ring. I focused at f/2, and turned the aperture ring to around f/4 immediately after pressing the shooting button. I repeated that several times with the hope that some of the exposure can be synced with the movement of the blades. As the result, you can see that the two cases in between (f/2-4) show diffused bokeh balls, while the f/2 and f/4 images have more defined bokeh ball. The effect can be done much better if I can control the speed of the aperture blades. The best case is Sony or any other camera company can engineer the camera to control the aperture blades to let them open or close during the course of exposure. I want to suggest this idea with the hope that I can have STF mode on the camera in the future. For now, if you want to do the same thing in a more practical way, you can try slow flash sync and close down the aperture ring in the long exposure time after the flash is off. Do you think it's feasible to control in camera? PS: someone just told me that Minolta came up with the same approach long time ago but no one is currently using it.
I've had the STF lens for 6 months now after picking it up for half price (!!!!) at my local closing Sony Store. I've had a lot of fun exploring the capabilities of this lens and overall love it. There are a few big issues I have though- 1) manual focusing accurately at 135mm is HARD with people and moving subjects and 2) the colour the lens produces is miles away from the colour my Zeiss lenses produce, and often takes some real fiddling in Lightroom to get it right. I find the colour of people quite cold and blue cast. But the positives- wow. This lens is producing stunning results for me and I now often look at a scene and before anything else wonder how the STF would render it. Here is my collection of STF photos, including a comparison shot showing bokeh and focus properties of the STF vs the Zeiss 135mm 1.8 ZA. I'd love some tips and feedback and especially from other owners of the STF lens. Thanks! https://www.flickr.com/search/?tags=sony135mmf28t45stfsal135f28&sort=relevance&user_id=35534197%40N02