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

Started 2 months ago | Discussions thread
RogerZoul
RogerZoul Senior Member • Posts: 2,377
Re: 90D. Well that’s disappointing for us 7D2 users

thomste wrote:

Lee Jay wrote:

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

So does this mean that you get the same result shooting with a 7dii and a 400mm lens at f4 or a 5div with 400mm lens + 1.6x extender at f5.6?

No.  The lens in the teleconverter can have flaws that reduce image quality. And it slows down the AF system, which can  have a negative impact on capturing an image.

 RogerZoul's gear list:RogerZoul's gear list
Canon EOS 7D Mark II Canon EOS 5DS R Canon EOS 80D Canon EOS 5D Mark IV Canon EF 400mm F4 DO IS II USM +32 more
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