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The physics behind a 35mm f/0.9 lens for $350

Apr 16, 2017 by Udi Tirosh 1 Comment

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For the wide aperture lovers, the way to get an  f/0.9-35mm lens for $350 has been here for a while (see video at the end of the post). However, did you know why using a 50mm, f/1.2 lens with a speed booster actually gives you an  f/0.9, 35mm lens? There is quite a bit of math involved but Jimmi Kai manages to squeeze a pretty understandable version of it into a nine minutes video. (Along with some other great tips and physics nuggets)

You’d want to watch the video to fully understand the physics behind it, but in a nutshell, Jimmy uses a cropped-sensor camera, along with a speed booster and a full-frame lens. This combo gains an extra stop of light while also re-adjusting the light beam to use not spill over the sensor edge.

To validate the theory, Jimmy tested three combinations of camera/lenses:

A cropped sensor A6300 with a 35mm lens @f/1.4

A full frame A7R2 with a 50mm lens @f/1.2

And a cropped sensor A6300 (again), this time with a LensTurbo II and a 50mm F/2.0 lens

As you see, they all kinda perform the same

So what about that f/0.9, 35mm lens for $350?

Well, once you are convinced with the science Jimmy showed in the previous video, It has to do with the video below which show a combo of a canon FD 50mm f/1.2 for about $290 along with a Roxsen speed booster for about $80

[35mm f/0.9 for $350 | Tested and Explained: Physics of Speed Booster and Crop Factoring | Jimmi Kai via reddit]

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Filed Under: Gear Tagged With: focal length reducer, Jimmi Kai, speedbooster

About Udi Tirosh

Udi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

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