[Elphel-support] Lens & storage questions

[support-list]

>If I mounted a 353 camera operating in line-mode 12 feet away from a flat surface and I wanted the camera to see a 40 foot wide portion of the surface, what lens specs would be needed?

Sensor line is 2592x2.2um=5.7mm,  so for the low distortion (rectilinear) lens you need f= 5.7mm*(12ft/40ft) =1.71mm.
The horizontal field of view = 2*atan((40ft/2)/12ft) ~=118 degrees, so you may check lens specs with the focal length around the 1.71mm if it has sufficient HFOV for the 1/2.5" sensor - these wide angle lenses are "fisheye" type and have strong barrel distortion, so you may need a lens with somewhat longer focal length than calculated for the rectilinear, f~=2.0mm.


>What is the maximum size of Compact Flash card the camera will support - 4G, 8G etc.?
It can be 16GB, just the card should support DMA mode - many support only UDMA claiming that they support DMA also, and Axis CPU used in the camera does  not work properly with UDMA. We will post the list of the cards that we know to work correctly.


>Is it possible to mount an internal mSATA SSD instead of the internal 1.8 HDD?

We tried that with older card from the EEEPC (http://wiki.elphel.com/index.php?title=EEEPC_SSD_SATA_Adapter)  - basically what became known as mSATA (mSATA is just a little shorter). The main problem in putting mSATA inside is that the SATA connector is on the back panel, so the cable comes out. But with some hacking it is possible, 

And the mSATA will be a standard feature for the 393 camera that I'm working on now.

Andrey