>>3646805>You will get same exposure when you used 50mm f4 on full frame and 35mm f4 on apsc when using same iso on same generation sensors.You're missing the point.
Yes, you will get (more or less) the same exposure with f/4 and same ISO regardless of sensor size.
But you can shoot ISO 800 in a situation where you have to shoot ISO 400 on the crop sensor, so you'd need to have an extra stop of aperture on the crop sensor to compensate for that if you want to keep the same shutter speed.
So in terms of whether or not you can get the shot, you need a stop wider aperture on your lenses for the crop sensor. That's what we mean.
>>3646812>Increasing iso decreases resolution and dynamic range. By increasing it you loose all advantages of larger sensor size.You lose the advantages of the larger sensor size, but in that scenario, you're one stop up in ISO and one stop down in aperture. That's the point we're making.
E.g.,
FF, ISO 800, 50/2.8, 1/100th
Crop, ISO 400, 35/2.0, 1/100th
These two will give you roughly equivalent shots. Roughly the same image quality, roughly the same depth of field, roughly the same field of view and perspective. To make them equivalent, you have to scale the aperture.
If you use the same aperture, i.e.,
FF: 50/2.0, ISO 400, 1/100th
Crop: 35/2.0, ISO 400, 1/100th
You'll get the same *exposure*, but you won't get equivalent pictures. The FF one will have shallower depth of field and better image quality.
