View Full Version : how to read gain on HV30/HV20
2008 July 3rd, 11:36
You probably know that but I'd like to share my observations with you; I recorded tape in HV30 and used Sony HC1 as a playback deck. To my surprise it showed me "db" on the screen; It looks like when HV30 was on auto (full gain) then camera goes to some kind of hyper gain (no db readings on Sony), for exposure "-2" it shows 18db, "-4" shows 15db, "-6" shows 12db etc.
2008 July 3rd, 11:43
Cool...why can't Canon include that on their LCD info.
2008 July 3rd, 12:00
Yeah mARIOb.....that was something we found out some time last year with the HV20. You would think they'd update that feature in the HV30.
2008 July 3rd, 12:14
* 1 f-stop == 6 dB
* Canon EV scale uses 4 steps per f-stop
* Canon EV scale does not make difference between real f-stops and gain in terms of how they are represented on the scale, this simplifies calculations.
* Therefore, one EV step equals to 6/4 == 1.5 dB
* EV scale has no fixed "0" point, therefore it is meaningless to say that -2EV == 18dB or something like that.
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