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Why aperture changes automatically on my 35mm Cron


Adalsteinn S.H.

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JPG gets corrected for a lot of things, that is the nature of the beast. If you want to see the difference in vignetting between uncorrected DNG and corrected, take two DNGs, one with lens detection enabled and one with lens detection turned off.

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It mainly depends on the focal length whether - or better: how much correction is done to the DNG. For wide angles there is also correction of colour shift which is not necessary for longer lenses. But even for a 135mm Apo-Telyt I see some very tiny correction of vignetting in the DNG-file if I use the lens with lens detection.

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One thing that I do however notice now when shooting JPB+DNG it that the jpg's get corrected for vignetting but the DNG's not. Is it safe for me to conclude that the 6-bit coding does nothing for the DNG's?

Yes. It is safe to think that.

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