From: clidman@eso.org
Date: Sat May 11 2002 - 07:08:08 PDT
Hi Rob,
For FORS1, the 0.7" slit is probably a better choice than 1" slit
for wavelength coverage reasons.
All the long slits are cut into a single mask and are in different
places in the focal plane, so the spectra are shifted relative to eachother.
This is not a problem with FORS2 as FORS2 has a bigger chip, but for FORS1,
the spectra will start at 6300 Angstroms.
If the SN have z>0.8, this is not a problem, but for lower z, this is getting
uncomfortably red.
Cheers, Chris.
"Robert A. Knop Jr." wrote:
> > I confirm the offsets. Slit PA will be -0.97 degrees and the slit
> > width will be 1".
>
> OK, at that slight width we should be pretty safe... I hope!
>
> (This underscores the importance of getting a shallow image for USNO
> matching. We have this image from the reference run when the seeing was
> *terrible* and we had to abort the exposure partway through due to
> clouds... which left us with a reasonably shallow image of the field.)
>
> -Rob
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