Raspberry Pi Forums

tchiwam

My issue is I do need the sub f1.4 for Northern light photography. That adds complications. It's generally hard to find really fast lenses when you start moving away from "normal" ones. That said, one used to be able to find 25mm (normal) lenses for 16mm cine work (C-mount) at F0.95. The fastest le...

tchiwam

I can't have a full sky camera, 1/4" is simply too small for the 1.04mm C mount lenses to give the full 185deg. Also preventing spectroscopy. A Mono sensor 1/3", low resolution would be fun for showing light physic. But the work around is to project on a 2nd plane. So you want a fisheye lens. That ...

tchiwam

I can't have a full sky camera, 1/4" is simply too small for the 1.04mm C mount lenses to give the full 185deg. Also preventing spectroscopy. A Mono sensor 1/3", low resolution would be fun for showing light physic. But the work around is to project on a 2nd plane. A mic input, Hard to show analogue...

tchiwam

Very interesting indeed. We now have a class room of 15 kids coming in their free time during one evening. We tried to keep the costs of the whole kit per kid to about 200$, previously tried to do it for 150$ but the quality of the equipment was very frustrating, keyboards and displays were rather r...

tchiwam

2015.11.14: stack max: https://www.youtube.com/watch?v=Hj0JYGUMjd8 Single frame: https://www.youtube.com/watch?v=UGQUkxczYJE 2015.11.15: Stack max: https://www.youtube.com/watch?v=fB-rGXdtLtM Single frame: https://youtu.be/m-E-GBGVHzI (once uploaded) This is an example of the Rpi cam + C mount lens ...

tchiwam

Forgot to say: 6 seconds, ISO 800 is enough

tchiwam

https://www.youtube.com/watch?v=Pcw85dwy8R8

Done with a PIcam and a Tamron 2.4mm F1.2 lens

tchiwam

If it was me voting and someone else doing the work, I'd prefer bigger pixels for better light sensitivity, over increased resolution. However no doubt that costs more, involves more work and I'm 0.0000000001% of the market so I don't think I get a vote

Make it 0.0000000002%

tchiwam

I am trying to figure out who to keep the configuration I have for the adafruit ulitmate GPS across reboots. Is there a better way than flashing the whole firmware ? I've been trough the manual a couple of times and can't find a 'commit' function anywhere.

tchiwam

You can find this camera from adafruit and it's compatible with the Pi. You can achieve the same with a normal Pi cam if you get a bit creative with the flex pcb and a very thin copper heat sink. the camera specs says that -35C is within the operation range.

tchiwam

I think I know where the interesting parts are so I'll try to make them as soon as we can have a new firmware( more than 128MB cpu memory is needed). I've put them in a table and sorted the values that you already grabbed. I use/need these: awb off ( Playing with the analog or digital gain of r and ...

tchiwam

I don't know if this might help you :
https://plus.google.com/+PhilippeTrotti ... KcSWLrdti9

Im putting the camera on a piece of copper and mounting a CS adapter on top of that...

I don't even know if bringing it down to the minimum temp is a good idea or if it lowers the noise at all...

tchiwam

Another note: with the raw firmware only 128MB of ram is available, even on a Rpi2

Something others might want to know

tchiwam

Oh yes and it works !!!

Anyone here having the 6second and ISO800 registers ? I'd love to have those !!

Thank you and thank you again !

I had an old version of wiringPi ... That's all

tchiwam

Seems that my current problem is with the latest device tree kernel. They took the i2c-0 off. I'm trying to find it back before I can continue with this one. Re-read the 1st post carefully, and now I have the i2c bus Raspistill works, but not with dtparam=i2c_vc=on I got as far as : mmal: Failed to...

tchiwam

Seems that my current problem is with the latest device tree kernel. They took the i2c-0 off. I'm trying to find it back before I can continue with this one. Re-read the 1st post carefully, and now I have the i2c bus Raspistill works, but not with dtparam=i2c_vc=on I got as far as : mmal: Failed to ...

tchiwam

Is this a 1/4" sensor or something bigger ?

tchiwam

This is my hope to get a bigger sensor on that bus !! And I only use and need straight raw data from the sensor, the least amount of post processing the better !

Thank you for doing this. I'm right now rebuilding a complete new kit on a Pi2 just to give this a go.

tchiwam

OK, I got this !! Thank you , sadly I only got this now, my new RPI2 + Noir Cam will thank you soon.

tchiwam

Bigger sized sensor

and known frequency / channel response.
5Mp is already plenty for the educational side of things...

Bigger sensor allows crude spectrography and more complex lens arrangement on a home (cheap) made light table...

tchiwam

Here's another possibility for someone who need his SPI pins for other projects. I often get my 42 bits with this one and the 18us+80us are a good hint if the read will work or not. clock_gettime Sample rate is ~ : 0.096417us (10MSample/s) using GPIO dt: 0.004147 samples:43011 I'm just starting with...

tchiwam

Thanks for the \[code\] tip Function ptrgpio 14.991MHz min:0.066564 max:0.066976 avg:0.066706 count: 10 Function ptrgpio + sleep(0) 4.728MHz min:0.211327 max:0.212040 avg:0.211521 count: 10 Macro 21.559MHz min:0.046291 max:0.046563 avg:0.046384 count: 10 Macro + sleep (0) 5.271MHz min:0.189596 max:0...

tchiwam

Reviving an old thread : My goal is to make a library with good enough timings to bitbang i2c, cameras, spi , serial stuff and address bus and data bus for PC104 8 and 16 bit(ISA bus with a pin trough connector). So I started to loop time the GPIO. I made some wrappers to make it easy and allow the ...

tchiwam

I'm just making my own grabber right now.
I get that bcm_host_init() is needed before calling anything GPU related.

I tried to google the bcm_host_deinit() and there's simply no mention of it. Suggested to be used at the end of the program or better left alone ?

tchiwam

If there's any new sensor, this is a suggestion that might be educationally relevant too.. The 1/4" sensor allows for some field of view, the widest I found is F2.0 1.05mm . And 6s/ISO800 is just at the lower limit I can use with a 2.2mm F1.2 lense for the faintest events. 1/3" would already bring m...

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