Which of these SLR cameras has better picture quality? Or should I go for a Nikon?

Canon - EOS Rebel T5 DSLR Camera with 18-55mm and 75-300mm Lenses - Black

Canon - EOS Rebel T5 DSLR Camera with 18-55mm IS Lens - Black

Canon EOS Rebel SL1 18MP Digital SLR Camera with 18-55mm Lens

Read more: Which of these SLR cameras has better picture quality? Or should I go for a Nikon?

Does every dslr camera making company produce their own lenses?

Are there any companies that use any other kind like canon or nikon lenses?
i know there s third party lenses for canon and nikon bodies…
but are there any third party cameras that use canon/nikon lenses?

Read more: Does every dslr camera making company produce their own lenses?

Does Canon have DX type lenses for there cropped body's?

Like with Nikon they have DX - cropped FX- full frame. So on Canon is it the same thing between there FF and cropped camera's?

Read more: Does Canon have DX type lenses for there cropped body's?

I recorded a video without sound?

Not too long ago I recorded a talk that was given by someone. I used a Nikon D3300 DSLR camera. I inserted an external microphone to the camera to make the audio better than what the DSLR offers as the standard/stock audio.

The problem is that I didnt check that I left the microphone turned off. For this reason the video was being recorded without sound, or in other words the video came muted.

Is it possible to un-mute or add the sound after the initial recording? Or is this altogether impossible?

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I saved a lot of money whats worth buying the canon 5ds, 5d mark iii, nikon d810?

i know canon 5ds is 50mp mark 3 22mp nikon d810 36mp which one is worth buying i m sucka for high mp that excellent but i want a camera that can do it give great image quality/ video i m not really to bothered im looking for a particular full frame to do it all street photography, landscape, portraits

could you also give me a few suggestions on excellent lens for portraits

Read more: I saved a lot of money whats worth buying the canon 5ds, 5d mark iii, nikon d810?