Arthur Brainville

125?! Not my choice as, ISO is a standard. And I should think that 125 is derived by sensitonetry: Develop it to the specified rate, and LogE o, 0.10 density above base+fog is used to calculate arithmetic film speed…

The question should be about EI (exposure index) and not ISO speed…

🤓

There was a number of BlackMagic Cine immersive cameras around the 14th of July celebrations in Paris.

Wonder when and where any of this footage will show up

... But the behavior will change if address is actually a string

Je rappelle quand même que à l’origine le Musk voulait le rendre open source l’algo en question

It was 56 years ago today Neil Armstrong first stepped on the moon — a worldwide event that millions tuned into, including me and my brother (even if I did fall asleep). It’s a big reason we became astronauts and a great example of what our country can do when we work together.

I hate the mere existence of US letter paper size, and it being used in PDF documents.

I am printing out some Kodak technical documents, and they all have a couple of centimeters of blank area at the bottom.

Because I lived in the civilized part of the world that use A4 paper.

A small loupe. The kind used to inspect photographic negatives

Behold. Preview.App !

Since I cleaned this contact, the camera has not hammed up yet. It shot 3 rolls of film since (one was a short one just to check if everything was alright in a bulk roll of fomapan 100 I just got)

If you manufacture hardware. And you orovide an SDK. And if you are choosing about doing it in C or in C++ for no good reasons (you’re basically just using namespaces and one class as 3 methods that could be functions.)

Please do it in C. It’s a lot more bindable and portable…. 😅

Prehistoric devices that put pixels onto dead trees so boomers can read too

Been testing out GodotBoy this morning, a project for @godotengine.org that lets you drop in your @gbstudio.dev game and export a native exe for Windows/Mac/Linux. Seems like this could a good way for anyone looking to distribute in the different app stores greenf0x.itch.io/godotboy-tem...

to add to the list of 3 things, there's also the possibility of doing masking.

And, I'd rather not try to get into masking at this time, especially for color I would need for contact print to use panchromatic black and white film, under the enlarger, in total darkness. Fun times...

RA-4 color balance will change depending on temperature, and I like things done in a reproductible way (my room temperature is not fixed. Especially in the summer!)

Chems live in a waterbath with a sous vide , and I develop in an old cibachrome drum

The shadows of the print are the highlights on the black and white negative. This is where pre-flashing would help recover details it seems.

Pre-flashing color paper is annoying to do. Need to first find neutral grey filtration, then find the amount of exposure needed.

I really really this image to be softer contrast. To illustrate, here’s a digitally made inversion of the above picture

Retaining the highlights and getting shadow details exposed and developed are the 2 things that should allow getting more of the tonal range of the slide expressed on paper.

This is the negative exposure developed. It kinda looks like if this was film, was pushed many many stops.

Maybe this result is effectively a low exposure over developed. It’s really hard to know.

Also this grey-ish thing is the maximum silver density on this color paper developed in BW

Yes maybe. I probably have everything needed.

There’s also the question of running that developer at RA-4 temperature or cold that I need to play with.

1:1 Dr Beers 2 solutions variable contrast developer Solution A (the low contrast Metol based one) did not improve this much

Process steps all at 35C. 45 seconds each unless stated otherwise

- pre wet
- 1st developer (BW)
- stop with citric acid (Bellini ecostop)
- wash for a minute (twice)
- pull paper out and **expose to warm high CRI led lamp for a minute**
- dev with RA-4 color developer
- stop
- blix
- wash again

All the test prints. First few are too blue.

I need to think about which of the 3 ways of reducing contrast I should try to test first. (May need all three of them combined)

The return of Cibachrome? We talk to Jeff Neale has been making Cibachrome quality prints with the RA-4 reversal process

The preflash and low contrast developer ideas comes from this article silvergrainclassics.com/en/2023/02/r...

I would like to avoid pre-flashing. 9 have played with lowering normal prints contrast with the sodium sulfite and it works. It notably prevent building too much density in the shadows. Which maybe the main issue at play here.

This is a scan of the slide.

You can see there is a lot of dynamic range lost on the printing process. I have 3 things I can attempt:

- use a low contrast BW developer as 1st dev before reversal exposure
- pre-flash the paper
- retard color development with sodium sulfite

This is a very first attempt of doing RA-4 reversal printing from one ektachrome frame.

I simply used ILFORD Multigrade black and white developer as 1st developer and just waved the print for a minute I for of a light before color development though the normal RA-4 process.

Need lower contrast

I have a KIEV 4A but I do not have the prooper takeup spool for it. I 3D printed something but it does not work very well

I also suspect that camera has a nasty annoying light leak due to a bad baffle behind the rangefinder glass... (apparently common issue)

I just saw someone use the expression "LLM hallucination propagation" to describe the compounding and self-reinforcing hallucinations when you let an LLM access your codebase, as analogous to NaN propagation in graphics

10/10 no notes lol

Somebody at apple really had fun writing shaders eh?

That apple redesign is a lot less drastic that what I imagined. This is really much not a iOS 7 moment

So... This may make me fall into a rabbit hole of explaining what I understand of the shutter cycle of the camera, as seen by part of it's electronic...

I have almost 1K words in a markdown file and I have not started explaining the actual problem

Businesses, you do not need to put this bullshit in the footer of your emails. This is not going to fix climate change

This is a picutre of what's under the left hand side of the Canon AE-1 Program's top plate. Circled in red is a small golden spring (probably plated). This spring want to contact a golden (also probably plated) post. I drew a blue arrow pointing to the contact point that can get dirty. Normally after you advance the camera, the white plastic bit at the end of the sprint moves out of the way, the tension on the mechanism makes this contact act as a closed switch. Camera uses this switch to both know that the shutter is ready to fire, and the fact that the 1st curtain started moving (for exposure time control)

I may actually write a blerb about this maybe on my mostly abandoned blog

A rarely documented online cause of shutter failure for Canon A-series (here AE-1 Program) cameras is the "SW4 Count Switch" not actually closing after the 1st curtain latch is armed if it's dirty, or corroded (or both)