Thanks for this - other cameras out of the question but I'll be trialling the helpful suggestions.
Why would a slower memory card help??
"In General"- Fast memory cards can cause more bursts of data through the camera. This can cause power-draw and noise issues for the electronics. Some of this might show up as noise in an image at High-ISO. This is true of the M240, M Monochrom, M9, and M8: I have not seen anyone test it on the Q. I also found some banding on the Df at highest ISO was improved by using a slow memory card.
Just a thought: try shooting at ISO2500 and use -2ev underexposure, then Boost the image 2 stops using your DNG processor, would be Lightroom in the case of the M8 shots as shown. With some cameras- this improves noise. I do not know the internals of the Q, but this trick works for other cameras.
This is a discussion forum. lessons learned with other cameras may or may not be applicable. Lessons learned with regard to Banding on the M8 were applicable to the M240. Knowing what works with one camera is worth trying on another. I found the low-noise performance of the Df improved by using the slow memory cards that got rid of banding problems with the M Monochrom. Does that make it worth a try with the Q? cheap experiment.
I spent 1981-1989 chasing electronics-induced noise on lab-grade Digital imaging sensors. The M Monochrom is a work of art with regard for isolating digital noise from the sensor.
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