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Thread: IIQ L vs IIQ Sv2

  1. #1
    Senior Member
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    Jan 2012
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    IIQ L vs IIQ Sv2

    Hi all -

    Has anyone ever tested the difference between these two file formats?

    Is it realistic to expect to be able to notice any difference whatsoever once the file has been processed?

    Thanks in advance,


  2. #2
    Workshop Member
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    May 2008
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    Re: IIQ L vs IIQ Sv2

    Yep, as a dealer we've done this test for each new back.

    You can consult with your dealer for more thorough details and example files, but at higher ISO the blacks (especially deep blacks that have been recovered) take on a different grain structure. It's subtle, but something you should evaluate thoroughly before making a choice between them. Similar differences can be found at low ISO but only in extremely deep shadows which have a lot of recovery applied. Since the switch from IIQ-S v1 to IIQ-S v2 the differences are even harder to find in practice.

    Importantly, IIQ-S is not compatible with LightRoom, while IIQ-L is compatible with LightRoom.

    I just shot another wedding with an IQ250 (last wedding was with an IQ250M, this wedding was with an IQ250H) and used nothing but IIQ-S the entire day. I wouldn't have considered IIQ-L unless I was going very high in ISO.

    The main benefit of IIQ-S for those who haven't tried it before, is raw file size drops fairly dramatically (processed to tiff they will still be the same size as always). My second shooter used a D800E and the raw files range in size from 39mb to 50mb. My IQ250H files range from 28mb to 44mb despite having higher resolution and more detail.

    IQ250H @ ISO100 on H4X with HC50mm Mark 1 at f/5.6 at 1/800th with on camera fill flash.
    Last edited by dougpeterson; 14th April 2014 at 06:37.
    Doug Peterson , Digital Transitions | Email
    Dealer for: Phase One, Mamiya Leaf, Arca-Swiss, Cambo, Eizo, Profoto
    Office: 877.367.8537. Cell: 740.707.2183

  3. #3
    Senior Member
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    Mar 2012
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    Re: IIQ L vs IIQ Sv2

    An advantage of IIQ L is that it's out in the open and is supported by almost any software that can read raw files, while IIQ S and IIQ Sv2 is not reverse engineered (at least not yet) and thus has weaker support. So for long term archive storage I'd choose IIQ L, so one does not end up being dependent on Capture One. I don't think Phase One is going to disappear anytime soon of course, but you never know where any company is in 20 years. One reason I prefer well-documented or at least reverse-engineered and widely supported formats.

    However if long-term archiving is not important I guess IIQ Sv2 is just fine, and I actually think Abobe's DNG converter supports it, but I haven't checked recently.

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