[Elphel-support] Canon EOS to C-Mount adapter

[Oleg]

> How can I use Canon lenses (EOS) with Elphel 353?
>
> **
>
> I only found EOS to C-Mount 16mm adapters on ebay and amazon, but as I
> see, Elphel 353 has 25mm connector.****
>
> http://www.amazon.com/Kipon-Canon-Mount-Lens-Adapter/dp/B004THUG6Icurrently unavailable, actually for a long time.
> ****
>
> **
>

The C-mount is a standard. The adapter you found will work.

However, because of the crop <http://en.wikipedia.org/wiki/Crop_factor> you
will get a smaller field of view and the canon lens will arguably provide a
better quality than a 1/2.5" format equivalent (same FOV but for 1/2.5").

Here's what we usually reply about selecting lenses:

We use the Micron 5 Mpix Sensor in Elphel cameras, format 1/2.5" (7mm
> diagonal) so the lens has to be 1/2" format.

The standard lens we recommend with Elphel cameras is 3Mpix Varifocal lens
> H3Z4518CS-MPIR.
> However you are welcome to choose lens, for example from:
> http://www.rmaelectronics.com/lenses.htm
> just keep in mind 1/2" or 1/2.5" format of the lens, that is compatible
> with the 5Mpix Aptina sensor in Elphel cameras.
> Lens manufacturers specify (when they do) "megapixel" resolution for the
> full lens format. Let's consider the 2/3" format lens that claims to be "5
> MPix" (HF12.5SA-1 http://www.rmassa.com/manu/fujinon.htm ). 2/3" format
> corresponds to the image size diameter 11mm.
> The sensor we use has diagonal of 7.1mm, so let's see how many pixels out
> of 5MPix will get to the sensor:
> 5Mpix*(7.1mm/11mm)^2 ~=2.1Mpix
> So we need to have "10 MPix" 2/3" sensor (there are some new ones, about
> $700) to nearly match the sensor (will still be some 4.2MPix, not 5).
> With 1" (16mm diagonal) things will be even worse.


Best regards,
Oleg Dzhimiev
Electronics Engineer
phone: +1 801 783 5555 x124
Elphel, Inc.
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