<div dir="ltr">On 16 April 2013 12:09, Jake <span dir="ltr"><<a href="mailto:jake@spaz.org" target="_blank">jake@spaz.org</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
the people/trolls on the discuss list can't see your attachments, but i looked at them and they are easier to see but maybe more blurry? I don't know.<br></blockquote><div><br></div><div style>I scaled them down and increased jpg compression so that it is easier on the mailing-list, but apparently the list rejects mails with attachments in the first place ? At least I didn't get any response from the mailing list - but I see that my mail does not show up in the archive :/</div>
<div style>So the scaling probably made them more blurry and exposes more how random the photons really were. Or the camera was on really high ISO so there is just a lot of noise.</div><div style><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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I was told to take pictures in a different format next time, maybe RAW format. <br></blockquote><div><br></div><div style>Raw format _might_ bring a bit more information in the lower bits, in particular when it is so dark - the tone-mapping then can help to get all low information. Longer exposure will bring more light, so that helps as well</div>
<div style>Also, what kind of camera is this ? I have a DSLR that I could bring (though will not leave it at NB). It has a bigger sensor compared to compact cameras and thus can collect more light with less noise.</div><div style>
<br></div><div style>> Also i think x-rays were hitting the camera despite the glass screen in put in there.</div><div style><br></div><div style>What screen did you have in-between ? It might help to re-use the old CRT glass (now that you have the other Barium screen) and rub it clean from fluorescent material and use that as transparent shield to take the picture through: it is heavy lead glass that is designed to shield from X-Ray.</div>
<div style><br></div><div style>> it was a 15 second exposure.</div><div style><br></div><div style>Maybe we can get up to a minute here ? I have some time on Thursday evening, are you up for some experiment with a DSLR ?</div>
<div style><br></div><div style>-h<br>
<br>
On Tue, 16 Apr 2013, Henner Zeller wrote:<div class=""><div class="h5"><br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Hi Jake,On 16 April 2013 01:21, Jake <<a href="mailto:jake@spaz.org" target="_blank">jake@spaz.org</a>> wrote:<br>
i improved the performance of the noisebridge xray machine, not<br>
by increasing the power of the xray source, but rather by<br>
replacing the glass CRT scintillator (taken from the screen of a<br>
macintosh plus) with a Barium Platinocyanide screen.<br>
<br>
<br>
This is very nice. Much easier to photograph, and probably brighter as well<br>
as it is made for this kind of stuff.<br>
<br>
<br>
Here is an xray of a CD player mechanism:<br>
<a href="http://spaz.org/~jake/xray-cdplayer.jpg" target="_blank">http://spaz.org/~jake/xray-<u></u>cdplayer.jpg</a><br>
<br>
Here is an xray of a Clipper card:<br>
<a href="http://spaz.org/~jake/xray-clippercard.jpg" target="_blank">http://spaz.org/~jake/xray-<u></u>clippercard.jpg</a><br>
<br>
<br>
This looks promising! How long was the exposure for these pictures ? Do you<br>
think the high-voltage supply can survive longer exposure ?<br>
<br>
It is possible to get a bit more contrast out of these pictures by modifying<br>
the curve (see attached mods).<br>
<br>
-h<br>
<br>
<br>
<br>
</blockquote>
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