Re: [APML] Esthetical effects filters

["John C. Mirtle" <jmirtle@shaw.ca>]

Thom,
    The filter I use I picked up in the late 80's, I don't know if the same
ones are still around. You  might want to drop in to your local pro
photoshop and ask for what they carry in "star" or "cross" filters. Mine was
made by Elicar. I picked 49mm as it fit most of my lenses, it is called an
8X-Cross filter. It's not a filter you want to use every night out, but it
does add a nice 'punch' to images if used sparingly. It's nice to have on
the nights when the planets are doing something interesting.
    The plastic one I had (past tense) was also a Cokin, a fairly large
chunk of plastic that slid into a big holder attached to the lens. The one I
used put the stars out of focus. Maybe try one shot first, before blowing a
whole night with it.... Apparently, pantyhose makes a great diffusion
filter, but I haven't tried it. (yet)

John Mirtle
http://members.shaw.ca/jmirtle

----- Original Message -----
From: "Thom Iwancio" <tiwancio@sc.rr.com>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Wednesday, May 07, 2003 6:36 PM
Subject: RE: [APML] Esthetical effects filters


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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