Megapixels.

[sk66]

Are they? I was under the impression that larger photosites collected more photons, as in being buckets rather than test tubes left out in the rain.

Larger pixels do collect more, they can hold more (larger DR), and they also require more.
Photosite exposure is a ratiometric value; it is simply a measurement of the number of photoelectrons collected VS the max capacity. If a larger photosite can deliver 4mv max, then 2mv is converted to "50% exposed" by the ADC. Similarly, if a smaller photosite can only deliver 2mv max; then 1mv is converted as 50% exposed.

In general this doesn't matter much... what actually matters is light per image/image area. If you have a greater number of smaller photosites (pixels), then the total is just divided up more... each photosite gets less, can hold less, and needs less. I.e. exposure/area and photosite oversaturation (clipping) stays the same.

But it does matter with dual gain photosites where they make the photosite "bigger" by adding a second capacitor in parallel to increase its' capacity at low ISO's. And they make the photosite smaller when there is less light available (switch the secondary capacitor off at some higher ISO). I.e. the Z9 has a base ISO sensitivity of 64 with the cap, and an ISO sensitivity of 128 with the cap disabled (turned off at ISO 500). I.e. the smaller photosite has a higher base ISO/reactivity; gets less light, needs less light, can only hold/use less light, and is "noisier" per pixel.

 

[Plain Nev]

Well Nod, you did ask.

 

[gman]

I did try nudge you in the FL ED direction. That lens is great on a D810. The lack of an AA filter makes it a much crisper file than a D800s

Same pixel density on a GFX100S to A7R4. So equally as hard. The GFX primes I imagine will get there or close at wide apertures. The zooms I'm not so sure. I'd trust the GFX zooms on the 50mp, not so sure on the 100mp - but they do say they were designed with 100mp in mind.

I'm not sure what in Sonys line up gets there - given a lot of the lenses were designed and released when 36mp was the highest res they did

I remember, but it was just a little more than I wanted to spend. Will start looking at some primes, although I've got a feeling that could be expensive as well.

Didn't realise the pixel densities were the same! So is it local density or number of pixels that's important for the lens being capable enough?

 

[SFTPhotography]

I remember, but it was just a little more than I wanted to spend. Will start looking at some primes, although I've got a feeling that could be expensive as well.

Used Sigma ARTs appear on here all the time. They're all good, I've had them all bar the 20, 85, 105 and 135. I'd say the weakest is 35, the 50 is great. The 40 and 28 are outstanding but odd FLs and rare used. The 24 is good but the Nikkor 24 1.4 is better - but more cost

Didn't realise the pixel densities were the same! So is it local density or number of pixels that's important for the lens being capable enough?

Actually the pixel density. The lens will actually have to work harder on a GFX100S than on a D850/z7,8,9

 

[gman]

Used Sigma ARTs appear on here all the time. They're all good, I've had them all bar the 20, 85, 105 and 135. I'd say the weakest is 35, the 50 is great. The 40 and 28 are outstanding but odd FLs and rare used. The 24 is good but the Nikkor 24 1.4 is better - but more cost

Actually the pixel density. The lens will actually have to work harder on a GFX100S than on a D850/z7,8,9

I wouldn't have thought the Sigma's would be rated so highly for resolving detail, I'll have to have a look. I'll need to think about focal ranges. Although, I've had a closer look on Flickr at various lenses used with this sensor and I might have been a little harsh on the 70-200mm. The image I was thinking about was shot at a shutter speed slightly too slow and whilst the VR was on I think at 200mm I lost a little sharpness rather than actual detail.

Anyway, this is going off topic, apologies.

 

[sk66]

Same pixel density on a GFX100S to A7R4. So equally as hard. The GFX primes I imagine will get there or close at wide apertures. The zooms I'm not so sure. I'd trust the GFX zooms on the 50mp, not so sure on the 100mp - but they do say they were designed with 100mp in mind.

I'm not sure what in Sonys line up gets there - given a lot of the lenses were designed and released when 36mp was the highest res they did

I rather doubt there are many/any lenses that can resolve to the level of the 100S. To resolve all wavelengths to under 5um (46MP FF) requires a lens that is free of any aberrations at f/2.8, and used at f/2.8 or wider; to get under 4um (100S) requires the same at f/2.

 

[Snapper67]

My Nikon D700 only has 12 mp, still gets high marks for any from it I enter to my local CC, projected and printed.

Just something about the images, it really is a classic Nikon.

Cheers,
Dougie.