RF-S Lenses - What We Know and What is Rumored

musicmaster wrote:

MikeJ9116 wrote:

Not to mention that the lenses referenced like the RF 100-400mm, the 600mm/800mm and others are not all that bright. If one says the 17-55mm f/2.8 wasn't fast enough for them then how can 600mm/800mm lenses at f/11,and the RF 100-400mm, be something they can recommend? Especially on a crop camera where the use cases for a f/11 lens is so narrow it makes them almost unusable. Even the RF 100-400mm is limited on a crop camera.

Why does the aperture being F/11 make a difference on a crop vs a full frame? It will focus the same, just using the inner 1.6x of the lens.

I assume most buying the 600 and 800 are wildlife / bird photographers where you are outdoors anyways.

On DSLR’s, the issues with slow lenses were the inability to focus if the max aperture was narrower  than f/8 (generally but with exceptions) and poor sensor performance at high ISO that produced noice and banding.   Mirrorless has solved the first problem and a combination of better sensors (in some cases) and better software has ameliorated the second.  Personally, I think I was programmed to avoid high ISO settings above 3200 based on what I read. When I got an RP, I was amazed how well ISO 10,000 or 12,000 could look with a little effort.  I did rent the 600mm once and used it at a bird park - both outside and in a birdhouse. It was a bit challenging inside - you needed a non moving subject because fast shutter speeds were just not possible. And even when a bird is stationary, it is still moving some part of its body.