Iso

T

teayce

Well-known member
I have read the ISO on the HMC-150 is 200, 500, 640 - can anyone tell me for sure what it is?
 
ISO info

ISO info

According to the stuff I have read it was 320 for the HVX200 and 500 for the 200A, 170, and 150.

It makes sense from what I have experienced as I have an original 200 and a 150 that I shoot with and the 150 seems about a half stop faster.

I know that the HVX book from Barry Green lists the HVX200 at 320 for the original and I trust his info.
 
No, nobody can tell you for sure what it is, because: IT DEPENDS. There is no fixed ISO. If you want to determine the ISO by getting a certain level of gray to expose at a certain level on the waveform monitor, then the ISO varies by what gamma curve you have selected, *and* by what f-stop you've selected.

Makes no sense, but I don't make the rules, I just report them. The article in the new HMC150 Book that discusses ISO runs two and a half pages!

In general, in HD NORM gamma, I'd call it roughly 500 and leave it at that, but if you need to know precisely, you can't. It ranges from 200 (at f/1.7) to 1000 (at f/11). It stays at 500 from f/2.8 through f/6.8, which is the middle range of the exposure curve, so I call it 500. It goes to 640 at f/8 and f/9.6.

Makes no sense. But it's the way it is.
 
Thanks for the correction...

Thanks for the correction...

that is good info to know. I look forward to seeing the HMC book as the HVX Book is awesome and has been a really great resource for me.
 
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