Just wondering if I use a 400mm f5.6 and get a ISO of 1600. If I use a 400mm f2.8, what ISO will I get? I tried googling but they don't seem to give exact relationship.
Holding everything constant? For example if I shoot at a point using 400mm f5.6, I get ISO 1600 when using aperture of f5.6. When I shoot at the same point using 400mm f2.8, will I get ISO 400 when using aperture of 2.8 (because of the 2 stops difference?)
The problem is I do not own a 400mm f2.8.
sorry ts for asking here
can i ask abit ISO, it "stop" count is it in this way?
100, 200, 400, 800, 1600, 3200, 6400, 12400
should i use on this few stop or can i use some in between? etc 640?
You can use whatever ISO is needed for your shot, and do not need to be limited to the full stops.
Just wondering if I use a 400mm f5.6 and get a ISO of 1600. If I use a 400mm f2.8, what ISO will I get? I tried googling but they don't seem to give exact relationship.
sorry ts for asking here
can i ask abit ISO, it "stop" count is it in this way?
100, 200, 400, 800, 1600, 3200, 6400, 12400
should i use on this few stop or can i use some in between? etc 640?
Holding everything constant? For example if I shoot at a point using 400mm f5.6, I get ISO 1600 when using aperture of f5.6. When I shoot at the same point using 400mm f2.8, will I get ISO 400 when using aperture of 2.8 (because of the 2 stops difference?)