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Travel / walk around lens for my EOS 600D

Started Oct 1, 2019 | Discussions thread
Rexgig0
Rexgig0 Veteran Member • Posts: 7,399
Re: F4.0 is too slow for indoor

Wave forest wrote:

The point is that F4.0 at 600D is too slow. It is equivalent to F5.6 at a full-frame camera.

OK, I pruned it down to the above two sentences. This is the part I would like to ask about, please. How do you know this to be true? I am questioning the math/science.

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By accident of availability, I learned to use Canon and Nikon DSLRs at the same time. I love specific lenses made by both Canon and Nikon, too much to quit either system. Dabbling with Leica-M is fun, too. I am, certainly, not an expert.

 Rexgig0's gear list:Rexgig0's gear list
Canon EOS 7D Mark II Canon EF 135mm F2L USM Canon EF 400mm f/5.6L USM Canon EF 100mm F2.8L Macro IS USM Nikon AF-S Micro-Nikkor 60mm F2.8G ED +54 more
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