Re: Matching T3i and 5D Image
 

Nigel, is it not over rated, it is a fact in test and in real life, ISO 1250 is cleaner than ISO 800

Re: Matching T3i and 5D Image
 

For discussion sakes, here is a video detailing noise between the ISOs.

https://vimeo.com/20239453

Now obviously this is with lens cap on and completely crushed blacks so it mainly has to do with dark noise (which is where most noise is anyway) so just use it as a point of reference.

Re: Matching T3i and 5D Image
 

Not on my 600D(T3i) it isn't.

Re: Matching T3i and 5D Image
 

Given that the T3i and the 7D have the same sensor, it should be identical (relatively) to the results of this test:

https://vimeo.com/10473734

Re: Matching T3i and 5D Image
 

we tried to match this as well.
i think the iso is not a big part to match the colors. WB is. // or WB shift.

on a 4200 on a 5D, since t31 or 7D(more yellow), we tried to dial 600 less we got a pretty close match.

the disadvantage of this is ofcourse having multicams and you have to communicate the dials all the time with each shooter.

Re: Matching T3i and 5D Image
 

Looks like the guy forgot to take the lens cap off:-) Frankly that sort of test is just plain pointless. Those clips are by definition so underexposed as to be off the scale. If the image isn't exposed correctly then all bets are off. MPEG4 video compression is a very complicated beast & what happens with video noise is way more complex than would be tested by shooting blackness.

Looking at real life footage ISO1250 to my eye is too noisy on the 600D/T3i whereas ISO800 is acceptable. However if it's necessary to use ISO1250 in order for the image to be exposed correctly then that is what I will use. If it's a choice between correctly exposed but noisy & underexposed & crap then I can live with some noise.