Re: [APML] Latest film reviews

[Jerry Lodriguss <jml@astropix.com>]

Keith,

You might want to look at the Fujichrome 100 and 400 also for its blue 
response.  You could take the red from the E200 and the blue from the Fuji.

Most of the color neg films around today don't seem worth using.

I know Don Westergren has done some hypering / sensitivity tests that seem 
to show the new Royal Gold 200 looks good (only when hypered), but from the 
spectral sensitivity curves, I really have to wonder.  I don't know if 
anyone has shot this new emulsion hypered for actual long-exposure deep-sky 
astrophotos.

Don, have you, or do you know of anyone else?

Jerry


At 09:44 AM 11/2/2002 -0600, you wrote:


>Keith Shank
>
>http://home.attbi.com/~kasism/wsb/html/view.cgi-home.html-.html
>Hello hope I have the right group (:)),
>
>Has anyone recently revised astro-photo film reviews with/without
>hypering?  I have been doing ccd work for several years and my only film
>use has been mostly un-hypered e200 or hypered TP in a 8" Schmidt
>camera, and LE400 unhypered for prime focus shots via 4" f/6.4 Vixen ED.
>However I am about to receive a somewhat larger instrument for use and
>am interested in shooting some film.
>
>Based on the constant flux of color films it seems the most predictable
>route is to just shoot TP in an LRGB format.  Perhaps getting a filter
>slider and just run one after another filter shot.  However, that color
>is just as arguable as using color film (eg what mix of what filters
>give what color) unless you go photometric colors.
>
>I would prefer to go lrgb using TP for the L (maybe Ha filter) and a
>good color base film for the 'pretty' part ala going 1xbin on ccd for l
>and 2x on rgb.
>
>First I need to find a color film that is actually available and that
>shows some penchant for use in astrophotography.  Second, does anyone
>have a starting point for hyper times on these color films?
>
>As a trade, I use TP as follows;
>
>- open reel, in tank
>- bring tank to 60c pull vaccum using Sargent Welch pump for 1hr
>- introduce Fg to 3 psi
>- bake for 10 h @ 60c
>- cool till tank is room temp
>- evacuate gas
>- put film in canisters with bits of silica gel and put on bottom shelf
>of icebox.
>
>The old Royal Gold (RG?) 200 was a good one but only availability is via
>ebay it seems and I must be dense but cannot be sure I have found the
>right version that is considered good.  LE400 is a bit too grainy,
>although available still through several vendors (it also is very red).
>E200 works, but is a bit weak in blues and is slow after 10' (man I do
>love shooting Schmidt camera times!).  Supra seems to have suffered end
>of life, and I just don't know what is left.
>
>Any help appreciated!
>
>Keith
>
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