Bernard,
The Arduino is more suited to that kind of task - it's more "low level".
The Pi is running Linux and is closer to a desktop.
Does really depend on your needs...

Have a look at the TriggerTrap website where they have an open source Arduino project that started them off
https://triggertrap.com/products/triggertrap-shield-for-arduino/

Not that I've used these personally. I spend most of my working life with micro controllers and ARM development! Very occasionally do some stuff at home, but am always happy to give advice

Matt

My general walkabout kit is K5IIs + DA*16-50. Surprisingly compact for such quality!

Prior to the DA*16-50 I used the DA17-70 which is a very nice lens indeed! As with all lenses that 'telescope' out, do protect them well while in the bag, etc

For landscapes and really wide, the DA12-24 is fabulous. Coupled with LR4 (which has good profiles) it takes out what distortion & CA there was and produces a top-notch image.

My general kit packs neatly into a tiny Lowepro Nova 3 with: K5IIs+grip+DA*16-50, DA*50-135, DA12-24, and the FA50/1.4 tucked inside. Still has room to take either the AF360 flash or the DA55-300. For long days it's the Slingshot 202 which can fit the same gear in (though not as neatly!).

Incredibly discrete and pretty much all I ever need!!

Matt

They don't stay moving for long... give them a few more years and they'll be more static in front of TV/Computer/iPad/iPod/iPhone/Tablet etc

Taking good images of lively kids is more down to technique than kit
(I have four - growing up too fast)
...be patient... and wait for the moment rather than hammering through shots.

Matt

Used my father's S1a over 35 years ago, ended up with a Zenit TTL, and then finally caught a Pentax S1a with over-the-top light meter and a 50mm 1.4
I think it was about 30 years ago... cost £45 IIRC (saved for ages!!)

Still have them both - but they are in need of a huge amount of TLC.

Then through MEF/MZ-5/Z1/*ist-D/K10D/K20D/K7/K5/K5IIs
(and family have/had ME-Super, *ist-Ds, Q)



Matt

Needless to say, I love using the K5IIs
Zero camera-envy since using it... well, nearly zero

I would add that using LR along with the QPcard 203 has enabled me to produce a lighting specific Lightroom Profile that gives much better colour rendition, and far less gamut clipping in the reds Generally I use just one custom profile taken under cloudy conditions.

Focus accuracy is vastly improved compared to the original K5 - especially in seriously low light.

If you're ever south of London, I have a growing collection of 18x12" prints if you want to see any!

Matt

Welcome back

I have found the K5IIs a huge and apparent leap up in terms of IQ from the K5. My commercial stuff has been flowers and gardens (Chelsea etc - see my gallery). True, the lens has to be up to it, (DA*16-50, DA*50-135, DA12-24), but with LR4 the detail and quality just leaps off the printed images

For me the dynamic range is perhaps the most important factor - and I've not used ND grads for a couple of years now!

Matt

Just processing the JPG images you've put up it looks like the Red and Blue channels are swapped
(Used a Channel Mixer in PS)

You haven't said what the original image actually was - DNG, PEF, JPG.

I'm not even 100% sure which camera you have! Though looking at your gallery it looks like a K5II.

I've seen the purple straggly line and seriously bad colour appear in Picasa when it wasn't up to date - and its RAW conversion was off. I had this issue with Picasa and the K5IIs until Google got its act (nearly) together!

More info would be good

Matt

Can't tell anything from the JPGs as you've stripped the EXIF information.
Can you post a straight-from-card version of the PEF/DNG/JPG?
Matt

Definitely a case of pareidolia
Matt

A quick checklist:

1. Try another battery
2. Ensure the latest firmware is installed (if you can get that far)
3. Try without the lens on the camera (just in case there's a lens issue)

Worth a try...
Matt