Re: How much of an X-Pro2 optical VF is blocked by the Voigt 23mm Nokton?
Well, let’s be clear.
Convention is 1/1500 or so the film or sensor diagonal. This is behind the approx 0.02mm for APS-C that FujiFilm uses in its “film” basis in its LCD zone markings. This is the same in the latter, corrected VX lenses.
This is the same basis (1/1500) as in the M mount lenses and full frame 0.03mm circle of confusion standard. Zeiss in some applications I believe has been slightly stricter, with 1/1750. But for my purposes here it’s all ballpark in the same zone.
This 1/1500 is behind the approximately 0.56mm-0.06mm for 6x6 medium format Hassleblad 500c lenses, for example.
What Voigtlander used for the 23mm F1.2 is blatantly incorrect and is far, far from 1/1500. I haven’t done the math, but it results in a MASSIVE zone, with like 1 meter to infinity in focus for a 23mm APS-C lens at F4 or so (my memory is hazy, but this is only a slight exaggeration). This suggests a CoC far, far smaller than the 1/1500 the diagonal or 0.02mm of APS-C. We’re not talking 1/1350 or some subjective standard. This is a blatant magnitudes off error.
Ironically, if you set the X-E4 to “pixel” basis with the VX23 F1.2, the zone it shows is consistent with the old 1/1500 convention, or 0.02mm for APS-C that, again, FujiFilm and everyone else (Ricoh, etc.) uses for “film” basis.
This funnily enough is fine for us who want sharpness good enough for traditional viewing of prints (i.e., “film” basis), but this is obviously not good enough for “pixel” peeping.
There is a clear error here. With the 18mm F2.8, Voigtlander corrected this and returned to the classic 1/1500 (0.02mm for APS-C) standard.
gyoung143 wrote:
Work out the DoF by the formula. I don't know whether the Vouigtlander lenses are right or not, but the pixel based settings for the viewfinder scales are a nonsense.
DoF is only relevant if you view an image at 'normal viewing distance, which is part of the calculation, and also fundamental to the illusion. You must view the image (uncropped) from far enough away to see the WHOLE image in one go. It all falls apart if you magnify the image, just as much with a magnifying glass on a print from film as it does on a monitor at 100%.
There is only one sharp plane of focus. In front of and behind that the image gets less sharp the further away you go, faster with larger apertures. The DoF illusion makes use of the inability of the eye and brain to perceive a certain amount of unsharpness.
Last time I looked Wikipedia had a very good explanation of it. Or buy yourself a good reference book, as I had to 60+ yearsago for the photo course I did.
Re: How much of an X-Pro2 optical VF is blocked by the Voigt 23mm Nokton?
Well, let’s be clear.
Convention is 1/1500 or so the film or sensor diagonal. This is behind the approx 0.02mm for APS-C that FujiFilm uses in its “film” basis in its LCD zone markings. This is the same in the latter, corrected VX lenses.
This is the same basis (1/1500) as in the M mount lenses and full frame 0.03mm circle of confusion standard. Zeiss in some applications I believe has been slightly stricter, with 1/1750. But for my purposes here it’s all ballpark in the same zone.
This 1/1500 is behind the approximately 0.56mm-0.06mm for 6x6 medium format Hassleblad 500c lenses, for example.
What Voigtlander used for the 23mm F1.2 is blatantly incorrect and is far, far from 1/1500. I haven’t done the math, but it results in a MASSIVE zone, with like 1 meter to infinity in focus for a 23mm APS-C lens at F4 or so (my memory is hazy, but this is only a slight exaggeration). This suggests a CoC far, far smaller than the 1/1500 the diagonal or 0.02mm of APS-C. We’re not talking 1/1350 or some subjective standard. This is a blatant magnitudes off error.
Ironically, if you set the X-E4 to “pixel” basis with the VX23 F1.2, the zone it shows is consistent with the old 1/1500 convention, or 0.02mm for APS-C that, again, FujiFilm and everyone else (Ricoh, etc.) uses.
This funnily enough is fine for us who want sharpness good enough for traditional viewing of prints (i.e., “film” basis), but this is obviously not good enough for “pixel” peeping.
There is a clear error here. With the 18mm F2.8, Voigtlander corrected this and returned to the classic 1/1500 (0.02mm for APS-C) standard.
gyoung143 wrote:
Work out the DoF by the formula. I don't know whether the Vouigtlander lenses are right or not, but the pixel based settings for the viewfinder scales are a nonsense.
DoF is only relevant if you view an image at 'normal viewing distance, which is part of the calculation, and also fundamental to the illusion. You must view the image (uncropped) from far enough away to see the WHOLE image in one go. It all falls apart if you magnify the image, just as much with a magnifying glass on a print from film as it does on a monitor at 100%.
There is only one sharp plane of focus. In front of and behind that the image gets less sharp the further away you go, faster with larger apertures. The DoF illusion makes use of the inability of the eye and brain to perceive a certain amount of unsharpness.
Last time I looked Wikipedia had a very good explanation of it. Or buy yourself a good reference book, as I had to 60+ yearsago for the photo course I did.
Re: How much of an X-Pro2 optical VF is blocked by the Voigt 23mm Nokton?
Well, let’s be clear.
Convention is 1/1500 or so the film or sensor diagonal. This is behind the approx 0.02mm for APS-C that FujiFilm uses in its “film” basis in its LCD zone markings. This is the same in the latter, corrected VX lenses.
This is the same basis (1/1500) as in the M mount lenses and full frame 0.03mm circle of confusion standard. Zeiss in some applications I believe has been slightly stricter, with 1/1750. But for my purposes here it’s all ballpark in the same zone.
This 1/1500 is behind the approximately 0.56mm-0.06mm for 6x6 medium format Hassleblad 500c lenses, for example.
What Voigtlander used for the 23mm F1.2 is blatantly incorrect and is far, far from 1/1500. I haven’t done the math, but it results in a MASSIVE zone, with like 1 meter to infinity in focus for a 23mm APS-C lens at F4 or so (my memory is hazy, but this is only a slight exaggeration). This suggests a CoC far, far smaller than the 1/1500 the diagonal or 0.02mm of APS-C. We’re not talking 1/1350 or some subjective standard. This is a blatant magnitudes off error.
Ironically, if you set the X-E4 to “pixel” basis with the VX23 F1.2, the zone it shows is consistent with the old 1/1500 convention, or 0.02mm for APS-C. This funnily enough is fine for us who want sharpness good enough for traditional viewing of prints (i.e., “film” basis), but this is obviously not good enough for “pixel” peeping.
There is a clear error here. With the 18mm F2.8, Voigtlander corrected this and returned to the classic 1/1500 (0.02mm for APS-C) standard.
gyoung143 wrote:
Work out the DoF by the formula. I don't know whether the Vouigtlander lenses are right or not, but the pixel based settings for the viewfinder scales are a nonsense.
DoF is only relevant if you view an image at 'normal viewing distance, which is part of the calculation, and also fundamental to the illusion. You must view the image (uncropped) from far enough away to see the WHOLE image in one go. It all falls apart if you magnify the image, just as much with a magnifying glass on a print from film as it does on a monitor at 100%.
There is only one sharp plane of focus. In front of and behind that the image gets less sharp the further away you go, faster with larger apertures. The DoF illusion makes use of the inability of the eye and brain to perceive a certain amount of unsharpness.
Last time I looked Wikipedia had a very good explanation of it. Or buy yourself a good reference book, as I had to 60+ yearsago for the photo course I did.
Re: How much of an X-Pro2 optical VF is blocked by the Voigt 23mm Nokton?
Well, let’s be clear.
Convention is 1/1500 or so the film or sensor diagonal. This is behind the approx 0.02mm for APS-C that FujiFilm uses in its “film” basis in its LCD zone markings. This is the same in the latter, corrected VX lenses.
This is the same basis (1/1500) as in the M mount lenses and full frame 0.03mm circle of confusion standard. Zeiss in some applications I believe has been slightly stricter, with 1/1750. But for my purposes here it’s all ballpark in the same zone.
This 1/1500 is behind the approximately 0.56mm-0.06mm for 6x6 medium format Hassleblad 500c lenses, for example.
What Voigtlander used for the 23mm F1.2 is blatantly incorrect and is far, far from 1/1500. I haven’t done the math, but it results in a MASSIVE zone, with like 1 meter to infinity in focus for a 23mm APS-C lens at F4 or so (my memory is hazy, but this is only a slight exaggeration). This suggests a CoC far, far smaller than the 1/1500 the diagonal or 0.02mm of APS-C.
Ironically, if you set the X-E4 to “pixel” basis with the VX23 F1.2, the zone it shows is consistent with the old 1/1500 convention, or 0.02mm for APS-C. This funnily enough is fine for us who want sharpness good enough for traditional viewing of prints (i.e., “film” basis), but this is obviously not good enough for “pixel” peeping.
There is a clear error here. With the 18mm F2.8, Voigtlander corrected this and returned to the classic 1/1500 (0.02mm for APS-C) standard.
gyoung143 wrote:
Work out the DoF by the formula. I don't know whether the Vouigtlander lenses are right or not, but the pixel based settings for the viewfinder scales are a nonsense.
DoF is only relevant if you view an image at 'normal viewing distance, which is part of the calculation, and also fundamental to the illusion. You must view the image (uncropped) from far enough away to see the WHOLE image in one go. It all falls apart if you magnify the image, just as much with a magnifying glass on a print from film as it does on a monitor at 100%.
There is only one sharp plane of focus. In front of and behind that the image gets less sharp the further away you go, faster with larger apertures. The DoF illusion makes use of the inability of the eye and brain to perceive a certain amount of unsharpness.
Last time I looked Wikipedia had a very good explanation of it. Or buy yourself a good reference book, as I had to 60+ yearsago for the photo course I did.
Re: How much of an X-Pro2 optical VF is blocked by the Voigt 23mm Nokton?
Well, let’s be clear.
Convention is 1/1500 or so the film or sensor diagonal. This is behind the approx 0.02mm for APS-C that FujiFilm uses in its “film” basis in its LCD zone markings. This is the same in the latter, corrected VX lenses.
This is the same basis (1/1500) as in the M mount lenses and full frame 0.03mm circle of confusion standard. Zeiss in some applications I believe has been slightly stricter, with 1/1750. But for my purposes here it’s all ballpark in the same zone.
This 1/1500 is behind the approximately 0.56mm-0.06mm for 6x6 medium format Hassleblad 500c lenses, for example.
What Voigtlander used for the 23mm F1.2 is blatantly incorrect and is far, far from 1/1500. I haven’t done the math, but it results in a MASSIVE zone, with like 1 meter to infinity in focus for a 23mm APS-C lens at F4 or so (my memory is hazy, but this is only a slight exaggeration). This suggests a CoC far, far smaller than the 1/1500 the diagonal or 0.02mm of APS-C.
Ironically, if you set the X-E4 to “pixel” basis with the VX2mm F1.2, the zone it shows is consistent with the old 1/1500 convention, or 0.02mm for APS-C. This funnily enough is fine for us who want sharpness good enough for traditional viewing of prints (i.e., “film” basis), but this is obviously not good enough for “pixel” peeping.
There is a clear error here. With the 18mm F2.8, Voigtlander corrected this and returned to the classic 1/1500 (0.02mm for APS-C) standard.
gyoung143 wrote:
Work out the DoF by the formula. I don't know whether the Vouigtlander lenses are right or not, but the pixel based settings for the viewfinder scales are a nonsense.
DoF is only relevant if you view an image at 'normal viewing distance, which is part of the calculation, and also fundamental to the illusion. You must view the image (uncropped) from far enough away to see the WHOLE image in one go. It all falls apart if you magnify the image, just as much with a magnifying glass on a print from film as it does on a monitor at 100%.
There is only one sharp plane of focus. In front of and behind that the image gets less sharp the further away you go, faster with larger apertures. The DoF illusion makes use of the inability of the eye and brain to perceive a certain amount of unsharpness.
Last time I looked Wikipedia had a very good explanation of it. Or buy yourself a good reference book, as I had to 60+ yearsago for the photo course I did.
Re: How much of an X-Pro2 optical VF is blocked by the Voigt 23mm Nokton?
Well, let’s be clear.
Convention is 1/1500 or so the film or sensor diagonal. This is behind the approx 0.02mm for APS-C that FujiFilm uses in its “film” basis in its LCD zone markings. This is the same in the latter, corrected VX lenses.
This is the same basis (1/1500) as in the M mount lenses and full frame 0.03mm circle of confusion standard. Zeiss in some applications I believe has been slightly stricter, with 1/1750. But for my purposes here it’s all ballpark in the same zone.
This 1/1500 is behind the approximately 0.56mm-0.06mm for 6x6 medium format Hassleblad 500c lenses, for example.
What Voigtlander used for the 23mm F1.2 is blatantly incorrect and is far, far from 1/1500. I haven’t done the math, but it results in a MASSIVE zone, with like 1 meter to infinity in focus for a 23mm APS-C lens at F4 or so (my memory is hazy, but this is only a slight exaggeration). This suggests a CoC far, far smaller than the 1/1500 the diagonal or 0.02mm of APS-C.
Ironically, if you set the X-E4 to “pixel” basis with the VX2mm F1.2, the zone it shows is consistent with the old 1/1500 convention, or 0.02mm for APS-C. This funnily enough is fine for us who want sharpness good enough for traditional viewing of prints, but this is obviously not good enough for “pixel” peeping.
There is a clear error here. With the 18mm F2.8, Voigtlander corrected this and returned to the classic 1/1500 (0.02mm for APS-C) standard.
gyoung143 wrote:
Work out the DoF by the formula. I don't know whether the Vouigtlander lenses are right or not, but the pixel based settings for the viewfinder scales are a nonsense.
DoF is only relevant if you view an image at 'normal viewing distance, which is part of the calculation, and also fundamental to the illusion. You must view the image (uncropped) from far enough away to see the WHOLE image in one go. It all falls apart if you magnify the image, just as much with a magnifying glass on a print from film as it does on a monitor at 100%.
There is only one sharp plane of focus. In front of and behind that the image gets less sharp the further away you go, faster with larger apertures. The DoF illusion makes use of the inability of the eye and brain to perceive a certain amount of unsharpness.
Last time I looked Wikipedia had a very good explanation of it. Or buy yourself a good reference book, as I had to 60+ yearsago for the photo course I did.
Gerry
Jul 09, 2025 at 04:04 PM
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