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Filter thread sizes Raspberry Pi 6mm and 16mm lenses

June 7th, 2020

The filter thread size for the Raspberry Pi 6mm CS mount lens is 27mm.

Raspberry Pi 6mm lens with step-up-ring

The filter thread size for the Raspberry Pi 16mm C mount lens is 37mm.

Raspberry Pi 16mm lens with step-up-ring

You can use  these lenses as macro lens by to reverse mounting them on the Raspberry Pi HQ camera.  That works surprisingly good. See my earlier posts.

In short: you need a reverse macro ring adapter and some step up rings. I use a Pentax K-mount adapter and ring, because I have some classic Pentax glass, that can be also used with the Raspberry Pi HQ camera.

 

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Macro Photography with the Raspberry Pi HQ camera and reverse mounted lens III

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 June 6th, 2020

Another try with some extra lighting, and post-processing with Darktable. See my earlier posts about photographing with the Raspberry Pi HQ Camera: part I and part II.

This time I used a special build of raspistill that offers a Field of Merit function to assist focusing. The Raspberry Pi Forum is full of helpful people and is very informative.

Fruit-fly taken with a Raspberry Pi HQ Camera and a reverse mounted Pentax 35mm lens

Fruitflies are the really minuscule flies that hang around you garbage bin, or home plants in the windowsill.

Not sure what the yellow blob is, maybe I caught the fly eating a piece of banana.

 

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Install Firefox Android on Android AOSP

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 June 6th, 2020

A small update on an older post Install Android browsers without Google Play because the download link on Mozilla’s pages has changed.

https://download.mozilla.org/?product=fennec-latest&os=android&lang=multi (direct download)

Also F-droid is highly recommended for free and open-source software.

F-Droid is a community-maintained software repository for Android, similar to the Google Play store. The main repository, hosted by the project, contains only free/libre apps. Applications can be browsed, downloaded and installed from the F-Droid website or client app without the need to register for an account. “Anti-Features” such as advertising, user tracking, or dependence on nonfree software are flagged in app descriptions.

https://en.wikipedia.org/wiki/F-Droid

And of course there are releases on the development site:
https://github.com/mozilla-mobile/fenix/releases

 

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Macro Photography with the Raspberry Pi HQ camera and reversing the lens II

June 4th, 2020

In a first post about Macro photography with the Raspberry Pi HQ camera I showed some pictures made with the reverse mounted lens technique and the new Raspberry Pi HQ camera.

But you might wonder what the exact setup was. So I show and describe it here. Yes, the 16mm lens is used upside down, or the wrong way. 😉

As I explained earlier. Normally you catch a big world in a small photo, and by reversing the lens you’ll get the opposite. You can make a small world big.

Exactly what you want for macro-photography.

 

Macro photography setup with the Raspberry Pi HQ camera and a reversed 16mm lens

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Firefox Bug with clip-path

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 June 4th, 2020

Firefox has a rather silly bug with overlapping clip-path. Instead of hiding content it start showing content with overlapping clip-path.

In short:

.clip {
clip-path: inset(400px);
}

on a 600px image should not show any content. In Firefox it does.

You can see the problem here.

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Macro Photography with the Raspberry Pi HQ camera and reversing the lens

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 June 3rd, 2020

The Raspberry Pi is a small computer, but it is a great machine for experimenting with all sorts of technology. The Raspberry Pi Foundation just introduced a new High Quality camera with changeable lenses, so let’s find out if that new camera board can be used for photographing small objects.

FruitflyRaspberry Pi HQ Camera

Fruitfly

And I’m gone a use a rather surprising but cheap technique: reversing the lens.

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