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  1. #81  
    Quote Originally Posted by Brian Boyer View Post
    Um...huh? I know it's not generally your style but could you explain what you mean in more detail. Perhaps start by explaining, in detail, what you meant about having high hopes for Gemini @1600 - you know, the process. Maybe I misunderstood what you meant.

    Then, maybe you could explain, in detail, what you thought I meant by Gemini @ 3200 - you know, the process. Maybe you misunderstood what I meant.
    Analog gain electronically boosts the signal prior to quantization and defines what gets captured. Digital equivalent boosts what got captured. So two different routes with differing advantages and disadvantages.

    Analog (real) gain push cuts off the DR in highlights and digital ISO equivalent push to 1600 just redistributes the captured. So...if the sensor is clean and saturated enough with 1600 ISO equivalent exposure it should offer more highlight range than rated at- and exposed to- ISO800 in normal mode, or 3200 in low light mode.

    So if all works out...with Gemini, generally speaking, one could choose between three possible approaches of exposure:

    1) ISO800 rating in normal mode - for cleanest image and best density
    2) ISO1600 rating in normal mode - for more balanced DR distribution, better highlight range and better low light performance
    3) ISO3200 rating in low light mode - for sensitivity priority and even better low light performance

    The same logic applies to Venice with ISO 500 and 1000 in normal gain and ISO2500 with analog gain boost, and with cameras using this dual gain principle as well.
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  2. #82  
    Senior Member Brian Boyer's Avatar
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    Quote Originally Posted by Hrvoje Simic View Post
    Analog gain electronically boosts the signal prior to quantization and defines what gets captured. Digital equivalent boosts what got captured. So two different routes with differing advantages and disadvantages.

    Analog (real) gain push cuts off the DR in highlights and digital ISO equivalent push to 1600 just redistributes the captured. So...if the sensor is clean and saturated enough with 1600 ISO equivalent exposure it should offer more highlight range than rated at- and exposed to- ISO800 in normal mode, or 3200 in low light mode.

    So if all works out...with Gemini, generally speaking, one could choose between three possible approaches of exposure:

    1) ISO800 rating in normal mode - for cleanest image and best density
    2) ISO1600 rating in normal mode - for more balanced DR distribution, better highlight range and better low light performance
    3) ISO3200 rating in low light mode - for sensitivity priority and even better low light performance

    The same logic applies to Venice with ISO 500 and 1000 in normal gain and ISO2500 with analog gain boost, and with cameras using this dual gain principle as well.
    Okay, cool, that's what I thought. We're on the same page. Except, I was talking about Gemini rated @ ISO 3200 in normal mode, not the low light mode, which is why your response was confusing.

    I'm assuming that's possible. I was under the impression low light mode had to be manually chosen and wasn't something that automatically kicked in at a set ISO.

    To be clear, when I say rated I mean with a light meter and the camera set for ISO 3200 and all the corresponding lens and ND settings. Wouldn't ISO 3200 in that context provide the same benefit in terms of highlight capture (1 stop) over ISO 1600 as ISO 1600 has over ISO 800?
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  3. #83  
    Quote Originally Posted by Brian Boyer View Post
    To be clear, when I say rated I mean with a light meter and the camera set for ISO 3200 and all the corresponding lens and ND settings. Wouldn't ISO 3200 in that context provide the same benefit in terms of highlight capture (1 stop) over ISO 1600 as ISO 1600 has over ISO 800?
    Sure, same logic. Two stops more at the top if exposed based on that signal distribution.
    But there is no free lunch here. Two stop push brings more tradeoffs. As one pushes the material, density gets reduced, which reduces tonal subtleties and overall image richness. Which also reduces the potential of post production.

    Due to online gear propaganda sites playing journalism it has become a trend to judge high ISO push performance predominantly based on the absence of noise. Which is okay for online blogosphere pics viewed on portable devices but not really for a material which needs proper post and appearance on the big screen and brings a DoP with some specific requests.
    http://i68.tinypic.com/drcb4y.jpg


    Analog > Camera feel optimization http://omeneo.com
    Digital > Camera performance optimization http://omeneo.com/primers

    imdb


    "Como delfines en el fondo del oceano
    volamos por el universo incentivados por la esperanza"

    "L'esperanza", Sven Väth
    "It's a poor sort of memory that only works backwards"
    Jung/ Carol
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