Hello everyone,
I hope you're well. I have a question regarding lens recommendations for Elphel
353l cameras. I have been able to find a couple of tips around your support
list and your blog, but a lot of the samples are dead links / lenses are
discontinued etc. I haven't been able to find anything close to my
specification requirements for quite a while, so I am turning to you with a new
thread.
Basically, we're using a pair (or more) 353Ls in a stereo application. The
cameras are synced, use a very narrow horizontal ROI, something along the lines
of 2592 x 96 px in the middle of the sensor. I am working on a stereo matching
application which could handle the high FPS from the camera as we need to build
a depth map as close to real time as possible. The cameras are fine for that
even though one seems to have misaligned sensor, which makes it a pain to focus.
The problem is that the application requires the cameras to scan a large
horizontal surface, around 2.5 m from a short distance, about 1 m away from the
target. Looking at the other threads, that would mean:
f = 5.8 mm * (1 m / 2.5 m) ~ 2.32 mm
HFOV = 2 * atan(2.5 m / 2) ~ 102 deg
We currently have a set of Kowa 3.5 mm lenses, which are not working out. We
need something with a bit wider HFOV and built for higher resolution cameras,
which is hard to come by. We can fiddle with the setup a bit, so the camera -
object distance is not set in stone, but I thought maybe you guys may have some
concrete tips for a good lens / manufacturer? Fujinon is sadly out of my
current budget. I found a Theia technologies SL183 that does look fine on
paper, but the sample shots they have sent me look barely usable as far as
distortion and softness goes.
A good resolution and low distortion is more important than wide angle in this
case, I'd settle for ~90+ degrees HFOV if there was nothing available. I am
also not really set on varifocal / monofocal as long as it has good optics.
Thank you very much for any help you may be able to provide and have a great
day,
Jan B.
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