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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras
Thread started 20 Oct 2008 (Monday) 16:56
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50D auto ISO

 
Sfordphoto
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Oct 20, 2008 16:56 |  #1

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


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Nervous
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Oct 20, 2008 18:34 |  #2

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.


7D | 5D classic | EF-S 10-22 | EF 24-105 L IS | EF 70-300 IS USM | EF 85/1.8 | EF 50/1.8 II | Sigma 24-60/2.8 | Tamron 90/2.8 | 580EXII | 2x 420EX | 055XPro + 488RC2

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sbbruin
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Oct 20, 2008 18:46 |  #3

Nervous wrote in post #6530846external link
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!




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Nervous
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Oct 20, 2008 18:52 |  #4

Well, at least it seems so.


7D | 5D classic | EF-S 10-22 | EF 24-105 L IS | EF 70-300 IS USM | EF 85/1.8 | EF 50/1.8 II | Sigma 24-60/2.8 | Tamron 90/2.8 | 580EXII | 2x 420EX | 055XPro + 488RC2

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Gotmoose
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Oct 20, 2008 21:57 as a reply to Nervous's post |  #5

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.


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Canon 7D Tokina 12-24 Canon 24-70L Nifty Canon 70-200 4L*430 EX

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overclock
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Fort Worth, TX
Oct 20, 2008 22:24 |  #6

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.




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sbbruin
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Joined Aug 2008
Oct 21, 2008 03:01 |  #7

overclock wrote in post #6532070external link
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!




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Nervous
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Oct 21, 2008 08:54 |  #8

Gotmoose wrote in post #6531934external link
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.


7D | 5D classic | EF-S 10-22 | EF 24-105 L IS | EF 70-300 IS USM | EF 85/1.8 | EF 50/1.8 II | Sigma 24-60/2.8 | Tamron 90/2.8 | 580EXII | 2x 420EX | 055XPro + 488RC2

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Nervous
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Oct 21, 2008 08:55 |  #9

sbbruin wrote in post #6532881external link
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....


7D | 5D classic | EF-S 10-22 | EF 24-105 L IS | EF 70-300 IS USM | EF 85/1.8 | EF 50/1.8 II | Sigma 24-60/2.8 | Tamron 90/2.8 | 580EXII | 2x 420EX | 055XPro + 488RC2

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fiveFPS
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Joined Sep 2007
Oct 21, 2008 13:29 |  #10

hahahaa... good one!

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


Canon XTI | Canon 430ex | Crumpler 7MDH | 18-55mm

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ef2
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Pittsburgh
Oct 21, 2008 13:53 |  #11

Nervous wrote in post #6530846external link
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.


5D Mk III
Canon 580EX
Canon 16-35mm f/2.8L | 24mm f/3.5L | 50mm f/1.4 | 100mm f/2.0 | 100mm f/2.8 Macro | 135mm f/2.8 SF | 70-200mm [COLOR=black]f/2.8L IS | 70-300mm f/4.5-5.6 DO
Sigma 50mm f/1.4 EX

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Scott ­ McLoud
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Highlands
Oct 21, 2008 14:05 |  #12
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ef2 wrote in post #6535459external link
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:confused:




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Nervous
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Oct 21, 2008 14:12 |  #13

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


7D | 5D classic | EF-S 10-22 | EF 24-105 L IS | EF 70-300 IS USM | EF 85/1.8 | EF 50/1.8 II | Sigma 24-60/2.8 | Tamron 90/2.8 | 580EXII | 2x 420EX | 055XPro + 488RC2

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sbbruin
Member
116 posts
Joined Aug 2008
Oct 21, 2008 16:25 |  #14

ef2 wrote in post #6535459external link
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.




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sbbruin
Member
116 posts
Joined Aug 2008
Oct 21, 2008 16:26 |  #15

Scott McLoud wrote in post #6535537external link
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:confused:

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




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50D auto ISO
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