Magic Lantern Forum

Using Magic Lantern => Raw Video => Topic started by: pascal on October 02, 2013, 11:43:29 PM

Title: Using <100 ISO instead of ND ?
Post by: pascal on October 02, 2013, 11:43:29 PM
Hello.

Is it smart to use an ISO smaller than 100 instead of applying an ND filter for RAW video capture?
Do the lower ISO values through ML cause negative side effects somehow?
Title: Re: Using <100 ISO instead of ND ?
Post by: 1% on October 02, 2013, 11:47:39 PM
Pink highlights on H264... should be no effect on raw as digital gain doesn't apply.
Title: Re: Using <100 ISO instead of ND ?
Post by: Marsu42 on October 03, 2013, 12:05:08 AM
Quote from: pascal on October 02, 2013, 11:43:29 PM
Is it smart to use an ISO smaller than 100 instead of applying an ND filter for RAW video capture?
Do the lower ISO values through ML cause negative side effects somehow?

No, it's not smart - iso 50 is just iso 100 pushed one stop, it thus looses dynamic range and will have the same blown highlights as iso 100. It's fine to have it just in case, but a good nd is the better solution, I guess these filters are very popular around videographers for a reason.
Title: Re: Using <100 ISO instead of ND ?
Post by: pascal on October 03, 2013, 12:20:15 AM
So we have 2 different statements. I assume Mr. 1% is right?
Title: Re: Using <100 ISO instead of ND ?
Post by: dmilligan on October 03, 2013, 12:26:37 AM
actually, they are pretty much the same answer,
1% is saying that using an ISO less than 100 won't have any effect at all on RAW (but answering your second question about side effects), ergo, there's no reason to use it, you will have to get some ND filters

it's digital, which means it's no different from applying it in post