just about to buy my first dslr

[Andrew C]

It's very simple. The base ISO is 200. If you set ISO to 200, you will be essentially at 0dB. Goes something like this:

ISO 200 - 0dB
ISO 400 - +6dB
ISO 800 - +12dB
ISO 1600 - +18dB
ISO 3200 - +24dB
ISO 6400 - +32dB

Unless you have AUTO ISO selected, the ISO/"gain" will not change on you and in any case should be displayed on the LCD. You should try some of the ISOs higher than 200. The T2i will be a lot less noisy than your HV30.

Thanks a lot !

 

[PSA1]

After playing around a little more with the T2i, it has a sharper lcd than my 7D, it was easier to focus with it using my zfinder, so here is one advantage of the cheaper model over the more expensive one.

 

[ydgmdlu]

ISO 200 - 0dB
ISO 400 - +6dB
ISO 800 - +12dB
ISO 1600 - +18dB
ISO 3200 - +24dB
ISO 6400 - +32dB

Where did you get this scale? In a standard decibel scale, an increase of 3 dB results in a doubling of power or intensity. So shouldn't each ISO stop only add 3 dB?

 

[shaocaholica]

Where did you get this scale? In a standard decibel scale, an increase of 3 dB results in a doubling of power or intensity. So shouldn't each ISO stop only add 3 dB?

I didn't really do that much research to verify but it seems like others have:

http://www.dvxuser.com/V6/showthread.php?t=43192

 

[ydgmdlu]

Thanks. Your last number is a bit off: It should be 30, not 32.