RE: [APML] Esthetical effects filters

["Thom Iwancio" <tiwancio@sc.rr.com>]

John, who makes the glass ones?  I have the Cokin 4 point I have used
nicely for terrestrial photos but haven't tried it for astrophotography.
I am pretty sure it is plastic.


Thom Iwancio
Elgin, SC
www.machunter.org


-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On Behalf Of John C. Mirtle
Sent: Wednesday, May 07, 2003 8:19 PM
To: Discussion of Film Astrophotography
Subject: Re: [APML] Esthetical effects filters

Here's a couple...
http://members.shaw.ca/spampit/cayley.htm
http://members.shaw.ca/jmirtle/m44.htm

These were done with a glass 8 point "star" filter. They are available
in 4,
6 and 8 point - possibly more. There are two types of star filters -
glass
or plastic. The glass ones usually are AR coated and work well, even
when
left on for the entire exposure. All the stars are sharp. The plastic
ones
usually introduce a so-called "soft focus" look. While this may make for
nice romantic portraits, they are totally devastating for astrophotos.
Stick
to glass.

John Mirtle
http://members.shaw.ca




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