50D auto ISO

can anyone tell me if its different than the 40D's auto ISO, or if its similar to the 5dmk2's auto ISO? just wondering

thanks

I've tested both 40D and 50D in AutoISO. I don't know how's good AutoISO on 5D, but here are the results of AutoISO testing of 40D and 50D, back-to-back. I set Av mode, F 4.0, focal range 35mm, spot metering, central point, Sigma 24-60/2.8, AutoISO on both. I am in the room with 4 lamps on, 3 on the ceiling and one on the table lighting the wall.

First is the 40D.
Aim on far wall - ISO 800, T=1/10
Aim on a lamp - ISO 400, T=1/6400 (what????)
Aim on lighted near wall - ISO 400, T=1/640 (too bad!).
Aim on worse lighted wall - ISO 400, T=1/160
Same, but focal is 50mm - ISO 400, T=1/200 (ah, whatever...)

50D, everything is the same:
Aim on far wall - ISO 1600, T=1/20 (expectable)
Aim on a lamp - ISO 100, T=1/1000 (!!!!! GREAT!)
Aim on lighted near wall - ISO 100, T=1/80 (!!!!).
Aim on worse lighted wall - ISO 160, T=1/50
Same, but focal is 50mm - ISO 250, T=1/80 (wow!)

Need I say more? AutoISO on 40D actually knows just two values - 400 and 800 and in fact is unusable. 50D shows a HUGE improvement here and I would use AutoISO on 50D with no hesistation.

Nervous wrote in post #6530846
Aim on worse lighted wall - ISO 160, T=1/50
Same, but focal is 50mm - ISO 250, T=1/80 (wow!)

Need I say more? AutoISO on 40D actually knows just two values - 400 and 800 and in fact is unusable. 50D shows a HUGE improvement here and I would use AutoISO on 50D with no hesistation.

wow, you mean that the camera actually took into consideration the crop FOV and chose it as the minimum shutter speed?? that is pretty good!

Well, at least it seems so.

I'm loving the auto ISO option. It seems to work well, I've had few situations where it is not pretty much picking the ISO I would normally have to set.

The auto ISO on the 40D was and still is a gimmick.

Auto ISO on the 50D is what the 40D should have been. Honestly, in many aspects the 50D is what the 40D should have been.

overclock wrote in post #6532070
The auto ISO on the 40D was and still is a gimmick.

Auto ISO on the 50D is what the 40D should have been. Honestly, in many aspects the 50D is what the 40D should have been.

dont tell that to the 40D owners who just bought their cameras before the 50D was announced!

Gotmoose wrote in post #6531934
I'm loving the auto ISO option. It seems to work well, I've had few situations where it is not pretty much picking the ISO I would normally have to set.

If you shoot in Av + AutoISO then exposure correction dial will change ISO first and only if this is not enough it will change the shutter speed. So, you may correct the ISO easily, if you don't like the one AutoISO picked.

sbbruin wrote in post #6532881
dont tell that to the 40D owners who just bought their cameras before the 50D was announced!

Even after, since changes in AutoISO were not advertised at all....

hahahaa... good one!

Nervous... nice write up on the sample iso test

Nervous wrote in post #6530846
I've tested both 40D and 50D in AutoISO. I don't know how's good AutoISO on 5D, but here are the results of AutoISO testing of 40D and 50D, back-to-back. I set Av mode, F 4.0, focal range 35mm, spot metering, central point, Sigma 24-60/2.8, AutoISO on both. I am in the room with 4 lamps on, 3 on the ceiling and one on the table lighting the wall.

First is the 40D.
Aim on far wall - ISO 800, T=1/10
Aim on a lamp - ISO 400, T=1/6400 (what????)
Aim on lighted near wall - ISO 400, T=1/640 (too bad!).
Aim on worse lighted wall - ISO 400, T=1/160
Same, but focal is 50mm - ISO 400, T=1/200 (ah, whatever...)

50D, everything is the same:
Aim on far wall - ISO 1600, T=1/20 (expectable)
Aim on a lamp - ISO 100, T=1/1000 (!!!!! GREAT!)
Aim on lighted near wall - ISO 100, T=1/80 (!!!!).
Aim on worse lighted wall - ISO 160, T=1/50
Same, but focal is 50mm - ISO 250, T=1/80 (wow!)

Need I say more? AutoISO on 40D actually knows just two values - 400 and 800 and in fact is unusable. 50D shows a HUGE improvement here and I would use AutoISO on 50D with no hesistation.

This sounds very promising, and might be exciting if the 5DMkII has the same functionality.

ef2 wrote in post #6535459
This sounds very promising, and might be exciting if the 5DMkII has the same functionality.

I agree, this does look promising.... wonder if the 40d had a fault in it and this was them fixing it or if it was just built that way

40D was built this way, since even manual says that in Av mode AutoISO works only in 400-800 range.

ef2 wrote in post #6535459
This sounds very promising, and might be exciting if the 5DMkII has the same functionality.

new 5d DOES have this technology. its auto ISO works according to the lens you have mounted, so its set to a minimum shutter speed of 1/focal length. i know this will definitely work for primes, im not sure about the zooms.

this is the reason i was surprised to see the 50d do this, since it has to calculate 1/focal length x 1.6 crop factor. according to nervous, it looks like it does indeed perform this, and he did this with a zoom, so im assuming the new 5d wil work with zooms also. good implementation by canon, but still not quite up to the auto ISO of nikon. i agree, MUCH better than any other canon iteration thus far.

Scott McLoud wrote in post #6535537
I agree, this does look promising.... wonder if the 40d had a fault in it and this was them fixing it or if it was just built that way

whats funny is that a simple firmware upgrade SHOULD take care of this issue, but it seems canon doesnt think its worthy of it...