[Elphel-support] starting an article...

[flavio soares]

Hi, Eric,

Thanks for the compliments!

About the lens, I'll tell you the little I've known so far. The most
important thing to know is the size of the sensor (in actual terms, it is
considered 1/2.5") and the mount. In theory, any C-mount lens made for old
movies (especially Super 8 or 8mm that have the film area close to the
sensor area) should work - but, as I say in the article, mine is best
working only at aperture 4 or 5.6. Only with close objects it gets fine
results at 1.8 or 2.8. So, if Elphel has a native ISO of 100 or so, in
practical terms - photography at the setting - I will have to think of
light as if it were ISO 50, which makes my lens also dark.

And stick to milimeters under 7.5mm or 6mm. I am constructing an adapter
here to use a 0.42x conversor, so that my lens becomes (a darker) 3.15mm.

I am trying to find a video of a guy who used an old Pentax c-mount lens in
a camera with incredible results, but I'm not finding it... I was also
researching old Kern-Paillards on e-bay, but I was worried even being
c-mount they wouldn't suit due to focus distance, it would make me lose
quite some time from shipping etc, since I'm from Brazil.

Maybe the best thing is to create a sort of list of the lenses we've been
using and posting resulting images for people to see. I'll post two of the
test videos later today at our blog, I'm just finishing them - maybe having
a visual can help more.


Cheers,

flavio



2012/8/17 Eric Boudrand <dev at boudrand.net>

> Hello Flavio,
>
> Thanks for this article. It is very useful (like the previous one).
>
> Is there lens more suitable for Elphel camera ? I am using a cheap
> Computar lens I am not very satisfy of. The image is quite dark even by
> bright sun. I saw on Apertus web site a lot of lens for Elphel, but are
> there some lens that more appropriate to the Elphel's sensor ?
>
> Regards.
>
> Éric Boudrand
>
>
> Le jeudi 16 août 2012 à 13:04 -0300, flavio soares a écrit :
> > Hello, everyone,
> >
> > In the beginning of June, I had sent an e-mail talking about an
> > article I was starting to write. Well, now it is nearly finished -
> > there is the last part, talking about audio recording, but this
> > research will only be done in a couple of months.
> >
> > The article is called "A somewhat comprehensible guide to using Elphel
> > as a Digital Cinema camera", and can be found at this address:
> >
> > https://szaszak.wordpress.com/linux/elphel-as-a-digital-cinema-camera/
> >
> > All in all, we have have been working a lot on the project of shooting
> > our movie with Elphel, and you can have a taste of it at our
> > production blog (http://florestavermelha.org/).
> >
> > I tried my best to give credits to everyone and link to the most
> > relevant pages of documentation. Please point me to the inaccuracies
> > there, and if there is any link or links you may consider relevant to
> > be mentioned at a certain part of the article, I'll do that with
> > pleasure. My intention is for it to serve as a starting point/general
> > overview for anyone that follows our path - to shoot a movie with
> > Elphel.
> >
> > I also wonder if there is any part (or parts, or full) you may
> > consider relevant to be posted at Elphel's development blog. In case
> > you consider valid publishing there, please tell me so.
> >
> > (btw, Andrey, now I can finally start messing with the coring
> > settings, as you had mentioned at the time.)
> >
> >
> > All in all, thanks for the wild experience. We are in the moment of
> > visiting locations, chosing actors and doing the production for
> > shooting. Everyone in the team is very excited and we plan to have a
> > screening party with the band performing the original soundtrack live
> > during the exibition of the movie, somewhere at the beginning of 2013
> > (probably). We hope to pass you those feelings!
> >
> > Cheers,
> >
> > flavio
> > _______________________________________________
> > Support-list mailing list
> > Support-list at support.elphel.com
> >
> http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
>
>
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