90D. Well that’s disappointing for us 7D2 users

Started 2 months ago | Discussions thread
Lee Jay Forum Pro • Posts: 54,792
Re: 90D. Well that’s disappointing for us 7D2 users

TheBlackGrouse wrote:

And while saving space and weight a crop body also gives an in-built 1.6 teleconverter without penalties (losing stops, slower AF).

Cropping is exactly the same as adding a teleconverter - the same loss of light, just accounted for differently.

Adding a teleconverter to the lens makes the combined optical system slower by the teleconverter ratio (multiply f-stop by that ratio).

Cropping reduces the total light captured by the exact same amount but does so by literally cropping out some of the light, either by cropping or by reducing sensor size.

In fact, if you think of the teleconverter as being added to the body, rather than to the lens, you can think of it as optically reducing the sensor size (and the pixels contained therein).  Same thing.

TANSTAAFL

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Lee Jay

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