RE: [APML] 4x5 astrocamera (again?)

[Kirk Carbo <kcarbo@lobosservices.com>]

What kind of exposure would it take for films that slow.  I made a couple of
exposures at TSP last year. One hour each on  Ilford HP5 400asa with the
lense wide open at f5.6 and it needed at least another 30 minutes.  The lens
needs to be stopped down too, so that would put me at 3 hours for one
exposure, which is consistent with the exposure times that Wallace and
Provin were using with hypered Techpan in an AP155 refractor.

Kirk Carbo

>-----Original Message-----
>From: Wei-Hao Wang [mailto:wang@IfA.Hawaii.Edu]
>Sent: Thursday, May 06, 2004 4:11 PM
>To: Discussion of Film Astrophotography
>Subject: RE: [APML] 4x5 astrocamera (again?)
>
>
>Hi,
>
>There are at least three 4x5 color films OK for astrophotography.
>Fuji Provia 100F, Velvia 100F, and Kodak E100S, which is still 
>available at B&H.  If I shoot 4x5, I will definitely buy lots of 
>E100S and put them in frig.
>
>Cheers,
>
>Wei-Hao
>
>______________________________________________________________________
>Wei-Hao Wang  :)
>
>Institute for Astronomy at University of Hawaii
>
>Address:                       Phone: 808-956-9867                  
>2680 Woodlawn Drive            Personal Website:
>Honolulu, HI 96822             http://www.ifa.hawaii.edu/~wang
>______________________________________________________________________
>
>
>
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