[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
Re: [APML] Bill Fletcher's Tri-color work(was 23a filter)
Preston S Justis wrote:
> Hi Michael,
>
> On Mon, 12 Jun 2000 11:11:51 -0700 Michael Stecker
> <mstecker@earthlink.net> writes:
> >
> >--
> > When I was doing tricolor about 5 years ago I used the
> >standard
> >Kodak Wratten filters recommended by Bill Fletcher.
>
> I've seen articles somewhere(?) regarding Mr. Fletcher's beautiful
> tri-color
> work. Could you or anybody on this list post some info on the filters
> and exposure factors that he used?? There doesn't seem to be anything
> on his website about the process.
>
> Thanks in advance,
>
> Scott
>
> Preston Scott Justis
> Astrophotography Home Page: (New URL)
> http://home.earthlink.net/~psjustis/index.htm
> ++++++++++++++++++++++++++++++++++++
>
> ________________________________________________________________
> YOU'RE PAYING TOO MUCH FOR THE INTERNET!
> Juno now offers FREE Internet Access!
> Try it today - there's no risk! For your FREE software, visit:
> http://dl.www.juno.com/get/tagj.
>
> -- APML Archives at <http://www.system.missouri.edu/apml/> ---
> Unsubscribe at <majordomo@seds.org>
Hello Scott:
We all owe a lot to Bill Fletcher. He was a pioneer in
film-digital astrophotography (not just tricolor). I believe he
perfected his process in 1992 or perhaps 1993, which was years before
anyone on this list was doing such work. He did this with Photoshop 2.5
(no layers) which made it vastly more difficult than it is today. He
spoke to Adobe and they thought his process at the time was impossible.
Even with this discouragement he was able to develop a process that works
quite well. In the November, 1994 Sky and Telescope on page 98 he wrote
an article on his technique. The article was general and gave little
specific data. The lead photo of the article was a tricolor of
Antares-Rho Ophiuchus region which I took with my Tamron 180 mm f/2.5
lens and hypered Tech Pan film and Bill processed in Photoshop 2.5. It
has been a long time since I took that photo (I think it was in 1993). I
believe I used a Kodak 25A for the red, 58 for the green and 47 for the
blue. The exposure times were 42 minutes in red, 80 minutes in green and
100 minutes in blue. In later work I increased the green and the blue
exposures. In my experience the hypered Tech Pan is least sensitive to
green light. The most challenging tricolor I have done was of the very
dim SNR Simeis-147.
During the past 5 years I have switched back to non-tricolor
techniques. The Kodak PPF film was so good that it sometimes surpassed
the tricolor technique and was vastly easier to use. I still found that
the main advantage of tricolor was that it used Tech Pan which is
sharper, more contrasty and finer grain than the color films.
Michael Stecker
--
Michael Stecker
mstecker@earthlink.net
http://www.homestead.com/mstecker/index.html
http://www.homestead.com/astromike/astrohp.html
http://www.homestead.com/astromike/astrogallery.html
http://mstecker.homestead.com/index.html
http://www.homestead.com/mstecker/nepalgeo.html
http://www.homestead.com/mstecker/iceberg.html
http://mstecker.homestead.com/anttxt.html
http://mstecker.homestead.com/egypthist.html
-- APML Archives at <http://www.system.missouri.edu/apml/> ---
Unsubscribe at <majordomo@seds.org>