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F11 lens with 2x TC = F22?

Started Aug 5, 2020 | Questions thread
makofoto Contributing Member • Posts: 534
Re: F11 lens with 2x TC = F22?

What's cool about the Sony RX10 mk4, when you "run out" of focal length at 600mm, you can continue with a Digital increase, BUT it is not simply Cropping! It is adding Interpolated lines of data.

The big difference in your discussion is requiring a larger ISO when using an extender as opposed to just cropping, in order to get the same exposure.

Reducers are interesting in that you gain exposure by concentrating the image. The opposite of what happens with an Extender. We used those, reducers, in the movie industry, but of course you need a lens that offers enough coverage in the first place. These were introduced to the Still biz by the Metabones Speed Boosters. Works great adapting Full Frame lenses to APS sized sensor cameras. Since you are concentrating the image, you can actually gain resolution ... IF the optics in the adapter are first rate.

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