4 Jul
2011
4 Jul
'11
12:20 p.m.
Tony Im just in the pocess of jury rigging a better close up experiment
http://www.collection.archivist.info/archive/fiche_experiments/50mm_canon_l…
was yesterdays experiment, some exposure error hence noise and also
thats hand held
next is to bolt stuff to a stand so I can increase exposure time and
reduce shake at the same time
I think I need a higher resolution sensor in the camera though
Dave Caroline
On Mon, Jul 4, 2011 at 7:53 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
I am experimenting and trying to improve methods and quality.
Basicly the light levels across the reader screen are just not up to the job.
http://www.collection.archivist.info/archive/fiche_experiments/
This is not my area at all (of course), but I am wondering if you could
get some improvement by processing the digital image.
Perhaps if you put a neutral density filter in the Fiche reader (no
fiche) and photogrpahed the reader screen from that you'd get an
indication as to how the light intensity varies over the screen. Then use
that to scane the brightenss of a photo of an actual sheet of fiche.
scanner version also shows the reader light
coverage error so Im going for a
close up lens on a digital camera method with a better backlight
the second attempt there (Canon 6mp, el back light, and lens resting
on the fiche ) shows some promise but the camera was pushed too far
from its comfort zone
I need a higher resolution camera and a brighter backlight and a solid mount.
Can you use 'traditional' closeup methods (extension tubes, bellows, etc)
with digital SLR cameras? If so, that's what I would be looking at using.
-tony