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Dear Sir:

Please check FastRawViewer Preferences -> Interface / Zoom -> "Use Logical pixels for zoom calculation", maybe it is the control you are looking for:

o If turned on (default, "legacy" behavior), then the pixel in the screen is considered to be the "logical pixel" (in the case of Retina, it's a block of 2x2 "physical" pixels) and the calculation of the zoom size is done in these units.

o If turned off, the zoom value is calculated in "physical pixels", so for Retina screens the displayed zoom value will now be doubled, and at 100% zoom the image will be half the size compared to "legacy" behavior.

This is page 132 of FastRawViewer Manual.

For your convenience, FastRawViewer Manual comes with the installation (main Menu - Help - "PDF Manual") and is searchable. You can also download it separately in higher resolution from the usual download location, - direct link is