scanners

[Philip Koeck]

Hi,

We tested the Scitex Eversmart Pro a few years ago for positional accuracy
and found it to be very bad in the direction that the scan head moves.
This might be because the scan head is driven by rubber belts.
One should definitely look at that when considering a Scitex.
Of course,they might have another system on other models.

Philip


----- Original Message -----
From: "Hernando Sosa" <hsosa at aecom.yu.edu>
To: <a.mcdowall at mailbox.uq.edu.au>; <3dem at SDSC.EDU>
Sent: Thursday, May 30, 2002 4:03 PM
Subject: Re: scanners


>   We are here also in the process of getting a scanner. We tested the
Imacon
> 848 by scanning a contact negative of a grid (~90 um spacing
square-square)
> and calculating its FFT. We found good resolution in one direction as
judged
> by looking how far the spots went. However in the opposite direction the
> spots start to smear out after 1/30um regardless of the chosen nominal
> resolution. We will be testing soon a Creo-Scitex scanner. This company
have
> several models, the high end (eversmart supreme @ ~$42000) claim to have a
> maximum optical resolution of 5600 dots/inch (4.4 um/pix) (they also quote
a
> lot higher interpolated resolution, but who cares about this). At least
one
> em lab that I know of uses this scanner. This company (Creo) also told me
> that they offer a new model for about $20000 that also has an optical
> resolution of 5600 dots/inch. It wasn't clear to me, by taking to the
> representative, if there was a trade off in the less expensive unit that
> would affect our application. We will also test this unit.
>
> Please let me know if you have a different experience in your tests or if
> you come across another scanner. So far it seems  very hard to find a
> suitable scanner for em  applications at a reasonable cost.
>
>
> Regards
>
> Hernando
>
> PS.  I would like to propose that whenever possible  these technical
> discussions been e-mailed to the em list, instead of keeping them private
> after the first email. I think this will increase the value of the
> discussion, as it is likely that  somebody not involved in the private
> discussion may have some useful opinion  to give or listen to.
>
>
>
> Alasdair McDowall wrote:
>
> > Colleagues,
> >
> >   I would like to buy the most suitable scanner for around US$20- 25,000
> > for high resolution em negatives.  I am considering favourably the
> > Imacon  848.  Does the 3DEM group have a better choice in this price
> > range or comments on the suitability of the Imacon product for this
> > purpose.
> >
> > yours
> >
> > Alasdair McDowall
> >
> > *************************************************
> > A/Prof. Alasdair W. McDowall
> > Deputy Director: Centre for Microscopy & Microanalysis
> > Assoc: Institute for Molecular Bioscience and
> > Dept. Anatomical Sciences.
> > Phone:  (07) 3365-1791  International:   +61 (7)
> > Facsimile: (07) 3365-2199
> > email: a.mcdowall at mailbox.uq.edu.au
> > http://www.imb.uq.edu.au/
> > http://www.uq.edu.au/nanoworld/nanohome.html
> > **************************************************
> > Senior Administrative Assistant:  Jill Lumsdale, Tel: (07) 3365 4206
> > University of Queensland,
> > Centre for Microscopy & Microanalysis,
> > St Lucia
> > Brisbane. QLD 4072
> > AUSTRALIA
> > *************************************************
> >
> > ----------------------------------------------------
> > To unsubscribe from this e-mail list, send mail to
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> > with the words
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>
> --
> -------------------------------------------
> Hernando Sosa
> Dept. of Physiology and Biophysics
> Albert Einstein College of Medicine
> 1300 Morris Park Av.
> Bronx NY 10461
> Office: 718-430-3456
> Lab: 718-430-3451
> FAX: 718-430-8819
> Email: hsosa at aecom.yu.edu
> ---------------------------------------------
>
>
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