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Cameras and Lenses

ciechanow.ski

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Re: Cameras and Lenses

#111

Post by antonfire »

h_spacer wrote: post #78
echelon wrote: post #75

Earlier quoted context omitted.

I'm still going to use they/them because a name doesn't necessarily match with one's gender.

Sorry to hear that you hold other cultures in such low regard.

If you think someone having a Slavic last name means their gender necessarily matches the gender suggested by the form of their name, you are just mistaken.

I have a Slavic last name. I also have female relatives whose last name is, quite officially, the male-suffixed version of mine. I invite you to guess how that might have happened.

Re: Cameras and Lenses

#112

Post by whatshisface »

daralthus wrote: post #109

The only thing better than a pinhole camera is a pinhole camera with multiple holes. Let me explain: When you have two holes (apertures), their images would likely overlap (depending on the arrangement). Imagine you took two photos from a few millimetres apart to the left and to the right, then you superimposed them. Some areas would look ok (as both views saw the same distant object) and some would be less ok (of ob…

>That "infinitely many overlaps" I was talking about happens with lenses too and is essentially a convolution where you convolve the image with itself (actually many different perspectives of itself if I am correct). Which is just the Fourier transform.

That statement is a bit muddled, let me unpack it. The infinitely many overlaps thing can be expressed mathematically as the convolution of the image with a function that's one where the aperture is open, and zero where it's not. The thing about the Fourier transform is actually related to a different phenomenon. When the slit is really small, you start getting diffraction effects. The diffraction bands are approximately the Fourier transform of the slit function. However that is not significant unless the slit is extraordinarily tiny.

Re: Cameras and Lenses

#113

Post by chandlerh »

Great article. One thing that's always stumped me as an amateur photographer is how an object is "in focus" when the rays from that object coverage to the smallest point, thus the smallest amount of pixels are getting hit. It would seem to me you would want to collect the max amount of information and thus use more of the sensor. How does converging to less of the sensor give you a sharper photo?

Re: Cameras and Lenses

#114

Post by iamacyborg »

thrav wrote: post #89
iamacyborg wrote: post #46

Earlier quoted context omitted.

Fuji also use what they call an X-Trans sensor. https://en.wikipedia.org/wiki/Fujifilm_X-Trans_sensor

I picked up a Fuji last Christmas, and it’s one of the best purchases I’ve made in the last decade. Their X-line takes incredible pictures, and is so approachable. If anyone has been considering more serious photography, or is having a child and wants to capture more unique shots of them, I can’t recommend them highly enough.

I'm a big fan, I'm using my XT3 as a webcam right now too!

Re: Cameras and Lenses

#116

Post by heavenlyblue »

antonfire wrote: post #104
h_spacer wrote: post #50

Earlier quoted context omitted.

Slav surnames are gendered. * ski is male, * ska is female, * sko is neutral. Using gender neutral in this case is as insulting as calling him a dog. Other cases where using gender neutral pronouns insults everyone speaking the language is using Latinx for Latino. If you want to butcher every other languages genders like they are in English, use Latin instead - the gender neutral form of Latino in English since only…

> Using gender neutral in this case is as insulting as calling him a dog. In English? No it isn't. You are the one who is "butchering" a language's pronouns by improperly mapping considerations into it from another language here, not vice versa. I have a Slavic last name, and I speak English fluently and Russian not-so-fluently-anymore. If you use "оно" to refer to me in Russian because you don't know my gender, it w…

Russians use “yous” or “вы” which is both gender-neutral and a polite pronoun.

Re: Cameras and Lenses

#117

Post by antonfire »

heavenlyblue wrote: post #116
antonfire wrote: post #104

Earlier quoted context omitted.

> Using gender neutral in this case is as insulting as calling him a dog. In English? No it isn't. You are the one who is "butchering" a language's pronouns by improperly mapping considerations into it from another language here, not vice versa. I have a Slavic last name, and I speak English fluently and Russian not-so-fluently-anymore. If you use "оно" to refer to me in Russian because you don't know my gender, it w…

Russians use “yous” or “вы” which is both gender-neutral and a polite pronoun.

That's for the second person pronoun, which are all gender neutral in Russian, whether they are singular or plural. (Like English.)

We're talking here about third person pronouns, and the "the plural is the polite version and the singular is the casual version" doesn't extend to those. You wouldn't refer refer to someone in the third person as "они" rather than "он" to be polite.

Re: Cameras and Lenses

#118

Post by dzhiurgis »

echelon wrote: post #8
Jaruzel wrote: post #7

Although I knew most of technical aspect described having immersed myself in Photography several years ago, I cannot express properly how GOOD this article is. The sliders and diagrams are brilliant for helping a layperson understand how it all works. Kudos!

You'd like their other work : https://ciechanow.ski/lights-and-shadows/ https://ciechanow.ski/gears/ https://ciechanow.ski/tesseract/ Etc. Check out the whole blog! It's amazing. These are some of the most intuitive explanations coupled with the slickest animation / demo work I've ever seen. All of that put together into crystal clear educational material is such a rare gem and requires incredible talent. Impressive…

I was wondering why it was lighting up as visited link. Turns out it’s same blog that posted few years ago something so special it took me entire Christmas to read!

Re: Cameras and Lenses

#119

Post by labcomputer »

IshKebab wrote: post #64
Jaruzel wrote: post #7

Although I knew most of technical aspect described having immersed myself in Photography several years ago, I cannot express properly how GOOD this article is. The sliders and diagrams are brilliant for helping a layperson understand how it all works. Kudos!

I agree, it's pretty basic but for people that don't know any of this it's an excellent explanation.

I wouldn't say it's basic at all. It's an excellent distillation of the physics of cameras.

My one minor nit-pick would be introducing the wave nature of light so early--to motivate Snell's law and total internal reflection, but without discussing diffraction until well later and only in passing.

Snell's law can be motivated from a purely classical particle-based model as:

1. Light travels slower through media other than vacuum (This is mentioned, but hand-waved as boundary conditions, which probably isn't meaningful to the intended audience). 2. Light takes the shortest (in time) path between two points. (Light... finds a way).

Either way, the audience might find the obvious "why" for the first point more satisfactorily addressed with a short sidebar on permittivity and permeability of materials (their electrical properties, effectively the capacitance and inductance "density").

That can also lead to an interesting discussion of why conductors are usually not optically transparent and insulators are.

Re: Cameras and Lenses

#120

Post by codetrotter »

daralthus wrote: post #109

The only thing better than a pinhole camera is a pinhole camera with multiple holes. Let me explain: When you have two holes (apertures), their images would likely overlap (depending on the arrangement). Imagine you took two photos from a few millimetres apart to the left and to the right, then you superimposed them. Some areas would look ok (as both views saw the same distant object) and some would be less ok (of ob…

> captures depth information and you can use it for 3d reconstruction, refocusing etc

That’s crazy cool! Got any good links for reading about how to do those things that way; 3d reconstruct and refocus?

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