Antisthenes

We're getting even further from a system where thermodynamic laws can be applied, then. The system is not isolated, and can have arbitrary, unknown inputs and outputs of energy. In particular, the ...

The fundamental error in which you are persisting is linking the F-number to the steady-state — a.k.a. equilibrium — temperature reached by the sensor. You also seem to be conflating / confusing ...

Yup. As you point out, a black body absorbs light, but also, simultaneously, emits light. As the energy flow is bidirectional, it's indeed erroneous to consider the black body solely as an ...

I assert that if we have two black bodies isolated from the environment, and one is hotter than the other, then, the temperature they'll reach after they exchange heat radiatively will be, at the ...

What the OP calls "thermodynamics" isn't really thermodynamics in the usual scientific sense of the word. The correct version of the second law considers the transfer of entropy between two initially ...

Assume the Sun is a Lambertian emitter. The angular intensity distribution of a Lambertian light source can be visualized as an intensity sphere Si that is tangent to the light source surface. Let' ...

I think the interpretation of "coupling from the Sun" is what distinguishes our respective approaches to the matter. If the Sun is considered Lambertian, then, the energy we must consider is the ...

That's an incorrect application of thermodynamics. The proper framework to evaluate the issue is étendue . Nothing in the conservation of étendue principle prevents the concentration of an energy ...

According to its published specs, he Canon EF35/2 IS has a magnification at MFD of 0.24x. The effective aperture difference between infinity and MFD for that f/2 lens should thus be about 0.48EV ...

To ease the calculation of statistics, your reply should just have as subject "numerical-USD-value N/T (no text)" — e.g. "99 N/T". Please do not add any comments to your reply. If you want to...

Therefore, any comparison with what a professional photographer with a G7 country-level cost of doing business would have quoted for shooting the material for a one-year marketing campaign by one...

The message Apple presumably intends to convey, by using the winning pictures, is that "iPhone-toting amateurs have /actually/ taken these nice pictures. /You/ could have been that person, so,...

This post relates to this DPReview News article: https://www.dpreview.com/news/9502832141/apple-announces-it-will-pay-licensing-fee-to-shot-on-iphone-contest-winners-after-complaints The message ...

There are also people who think that the Nikon Z mount's diameter was somehow an enabling factor for the Nikkor Z 50/1.8S (excellent, but, at 12 elements, quite complex) optical formula. Again, it...

The fact that Canon EF lenses, with their large throat diameter, are far from dominating the lens test results conducted by various third parties proves that a large throat diameter is not a...

As to the physical possibility of f/1.2 AF lenses:

Care to explain why, after I've provided a picture of a Sony E mount lens with electrical contacts, and with a baffle width that's only a few...

Reading comprehension doesn't seem to be your forte. I am not discussing unavailable Nikon lenses of unknown dimensions. I'm discussing /your/ assertions, as they relate e.g. to Canon's RF...

You stated that with fast lenses — say, the RF50/1.2 ? — or designs like the RF28-70/2, the RF mount's wider throat makes a difference. You've been making such assertions, without providing a...

Imbeciles like you can't even tell the dfference between fact and mere opinion, be they posted on DPreview or on Stackexchange.

I provided links to facts — e.g. that the the distal ray of an...