Doug Kerr
Well-known member
The information to follow is gleaned from the manufacturer's manual for the camera discussed and a number of Internet articles.
Introduction
The Fujifilm GFX 100RF camera is a fixed-lens fixed focal length (35 mm) camera with a sensor 43.8 mm × 32.9 mm in size, having a native resolution of 11,648 × 8736 "pixels" (about 101.8 M "pixels"). (These are actually "sensels", not pixels.)
It has two settings that jointly control the portion of the sensor's image that is presented in a JPEG output file, what we might describe as various "crops" of the taken image. These are:
• The aspect ratio setting
• The digital tele-converter setting
The aspect ratio setting
The aspect ratio setting offers 9 different aspect ratios, plus the ability for the user to numerically set one not in that repertoire. The preset aspect ratios are:
4:3 (native), 5:4, 7:6, 1:1 (square), 3:4, 17:6, 65:24, 16:9, and 3:2.
I state these in the order in which they will appear in a table, below, not in order of actual numerical ratio. The smallest ratio is 1.333:1 (4:3); the largest is 2.833:1 (17:6).
When one of these other than 4:3 is set, the image is cropped to the largest image with the selected aspect ratio that that can be extracted from the "taken" image (we will see this numerically a little later.)
This only affects the pixel dimensions of the JPEG output if any. (I understand that this setting is ineffectual if the output mode is set to "RAW only".) It does not effect the sensel dimensions of the raw image (if one is to be taken). But if a raw image is taken, the pixel dimensions that would be implied by the aspect ratio setting are embedded in the metadata of the raw file.
The digital tele-converter setting
The digital tele-converter setting (which we might call the "digital zoom" setting) allows, by cropping of the image in a delivered JPEG file, emulation of the field of view that would be achieved with lenses of various focal lengths. The choices are:
35 mm (the actual focal length of the camera's lens), 45 mm, 63 mm,, 80 mm.
The "cropping" to achieve these fields of view only applies to a delivered JPEG file. This setting has no effect on the sensel dimensions of the raw file (if taken). I assume that this setting is somehow reflected in the metadata of the raw file, but i have not any actual information on this.
We will see the effect of this numerically a little later.
The joint effect
The effects of these two settings concatenate. So if the digital tele-converter setting is 35 mm (meaning the actual focal length of the lens, for any of the aspect ratios other than 4:3, the crop is the largest in one dimension or the other that is contained in the sensel dimensions of the take image.
But then, for any digital tele-converter setting other than (greater than) 35 mm, the pixel dimensions of the delivered JPEG file mentioned just above are scaled down accordingly.
This table is taken from an Internet review of this matter by Dan Carr on the shuttermuse.com site, and is shown here under the doctrine of fair use. It pertains if the image size setting is set to large.
Thanks, Dan.
It shows for each of the combinations of aspect ratio and digital tele-converter settings the pixel dimensions of the delivered JPEG file (and its pixel count).
About the raw file
Again recall that regardless of the settings of these two factors, the sensel dimensions of the raw file (if taken) will be 11,648 × 8736. Accordingly in development of the raw file in a raw development program, it is assumed that one could then crop the developed image (which will be 11,648 px × 8736 px as desired for the delivered JPEG (or TIFF, etc.) image
I think.
Best regards,
Doug
Introduction
The Fujifilm GFX 100RF camera is a fixed-lens fixed focal length (35 mm) camera with a sensor 43.8 mm × 32.9 mm in size, having a native resolution of 11,648 × 8736 "pixels" (about 101.8 M "pixels"). (These are actually "sensels", not pixels.)
It has two settings that jointly control the portion of the sensor's image that is presented in a JPEG output file, what we might describe as various "crops" of the taken image. These are:
• The aspect ratio setting
• The digital tele-converter setting
The aspect ratio setting
The aspect ratio setting offers 9 different aspect ratios, plus the ability for the user to numerically set one not in that repertoire. The preset aspect ratios are:
4:3 (native), 5:4, 7:6, 1:1 (square), 3:4, 17:6, 65:24, 16:9, and 3:2.
I state these in the order in which they will appear in a table, below, not in order of actual numerical ratio. The smallest ratio is 1.333:1 (4:3); the largest is 2.833:1 (17:6).
When one of these other than 4:3 is set, the image is cropped to the largest image with the selected aspect ratio that that can be extracted from the "taken" image (we will see this numerically a little later.)
This only affects the pixel dimensions of the JPEG output if any. (I understand that this setting is ineffectual if the output mode is set to "RAW only".) It does not effect the sensel dimensions of the raw image (if one is to be taken). But if a raw image is taken, the pixel dimensions that would be implied by the aspect ratio setting are embedded in the metadata of the raw file.
The digital tele-converter setting
The digital tele-converter setting (which we might call the "digital zoom" setting) allows, by cropping of the image in a delivered JPEG file, emulation of the field of view that would be achieved with lenses of various focal lengths. The choices are:
35 mm (the actual focal length of the camera's lens), 45 mm, 63 mm,, 80 mm.
The "cropping" to achieve these fields of view only applies to a delivered JPEG file. This setting has no effect on the sensel dimensions of the raw file (if taken). I assume that this setting is somehow reflected in the metadata of the raw file, but i have not any actual information on this.
We will see the effect of this numerically a little later.
The joint effect
The effects of these two settings concatenate. So if the digital tele-converter setting is 35 mm (meaning the actual focal length of the lens, for any of the aspect ratios other than 4:3, the crop is the largest in one dimension or the other that is contained in the sensel dimensions of the take image.
But then, for any digital tele-converter setting other than (greater than) 35 mm, the pixel dimensions of the delivered JPEG file mentioned just above are scaled down accordingly.
This table is taken from an Internet review of this matter by Dan Carr on the shuttermuse.com site, and is shown here under the doctrine of fair use. It pertains if the image size setting is set to large.
Thanks, Dan.
It shows for each of the combinations of aspect ratio and digital tele-converter settings the pixel dimensions of the delivered JPEG file (and its pixel count).
About the raw file
Again recall that regardless of the settings of these two factors, the sensel dimensions of the raw file (if taken) will be 11,648 × 8736. Accordingly in development of the raw file in a raw development program, it is assumed that one could then crop the developed image (which will be 11,648 px × 8736 px as desired for the delivered JPEG (or TIFF, etc.) image
I think.
Best regards,
Doug
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