[Comm2011] light leaking in through aux filters

[Edwin A. Valentyn]

Thanks Koen,
but why didn't we spot this on the flats taken earlier???
Edwin


On 6-8-2011 9:40, Konrad Kuijken wrote:
> Here are some pictures of the results of Bernards tests covering one 
> of the aux filters in dome flats. Clearly some light does leak through 
> in this way. With the dome lamps the peak contamination of the flat 
> fields are are
>
> u ~ 30%
> v ~ 5%   (Stroemgren)
> z ~ 1.2%
> r ~ 0.2%
>
> They affect at least the two ccds near the aux ccds.
>
> r106, r107, r107-106: r filter from night 217   (ie FLAT217_0106 etc)
> u01,u02, u02-01: u filter from night 214
> v29,v30,v30-29: v stroemgren from night 216
> z27,z28,z28-27: z from night 216
>
> Notice also how in a few cases dust specs on the filters came and 
> went: they cause a <0.05% effect.
> Certainly for u this is going to make data reduction even more complex.
> Koen
>
>
>
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> Comm2011 at astro-wise.org
> http://listman.astro-wise.org/mailman/listinfo/comm2011

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