2023 big year for Fuji?

jbuzzinco wrote:

Rod McD wrote:

jbuzzinco wrote:

jhorse wrote:

jbuzzinco wrote:

Fujifilm needs to update the rest of their lenses that don't resolve to match the new 40mp sensor. Given their limited R&D and manufacturing capacity, I'm wondering what will be prioritized. Will they work on new cameras with the new sensor or update more lenses?

Not sure that is necessary, but I agree that it would be welcome. Here is a quote from the Amateur Photographer review of the XT5:

"Clearly, some Fujifilm users might be concerned about whether their existing lenses will be sharp enough for the 40MP sensor, especially after the firm released a list of those required to get the most from it. But my advice would be not to worry about it. You’ll never get worse results from any given lens with a higher resolution sensor; instead, it’s just a question of whether the extra detail you record is fully proportional to the increased pixel count. If you’re happy with the lenses you’ve got, they’ll still work fine on the X-T5. And that 40MP resolution gives so much scope for cropping if you need it."

Fujifilm X-T5 review: 40MP stills sensation - Amateur Photographer

Although I mostly use a 16-55/f2.8 on my XT5, I sometimes use my older 18-55, which is not on this marketing ploy list, and it performs just fine.

Actually, you could get worse results. A lens which cannot resolve to a point smaller than the pixel size on the sensor will cause diffraction at all apertures. That would make it impossible to achieve any high contrast lines in the image.

No. You're conflating a number of different concepts. The lens' resolution capability does not cause diffraction. It's a product of aperture and wavelength. It's there anyway, but the higher res sensor makes it possible to see the impact of diffraction at a wider aperture. A lens of low resolution capability may not extract the optimum from a high res sensor, but the image will not be worse than the same image from the same lens on a lower res sensor.

Regards, Rod

Didn't want to go off topic for much longer, but here we go

Diffraction is first affected by the diameter of the optical clear aperture. This occurs even with the entrance pupil (aperture) wide open. Diffraction over the edges of the mechanical aperture occurs as it is closed down. Together, these determine the diameter of the airy disk projected on the imaging surface.

What you describe is actually one thing, not two. It is the aperture. Even at f/22 the aperture diameter is still 100s of times larger than the wavelength of light and the sensor is 10,000s wavelengths away from the aperture. In practice, the aperture is not a perfect circle and this is why we see "star bursts". Their shape is described by far field Fraunhofer diffraction for which you need to know the exact shape/size of the aperture and the wavelength of light. That's it. If one assumes the aperture is a perfect circle, they will derive the equation for the Airy disc.

If a lens is unable to focus a single point source down to an area smaller than a photosite on the sensor, a light point source is projected over the edges of a photosite rather than entirely within it.

Sure.

Semantics aside, if a lens is unable to focus a point smaller than a photosite, you will not be able to render any pure black/white contrasting edges. Everything will be shades of gray.

But it always is!

The airy disk of the point will spill into surrounding photosites.

They can do that even when they are smaller than a photosite.

Projecting the same point through the same lens onto a lower resolution sensor where the entire airy disk is within a single photosite will give a cleanly defined edge.

This might be true in the unlikely event that this edge runs exactly in the middle of a raw of pixels. What if it runs at an angle across multiple raws of pixels? Most lines in photos do.

The end result is the same. The airy disk projected on the sensor is too large. It does not matter whether the diffraction is caused by the optical clear aperture or the mechanical entrance pupil aperture.