Re: [APML] Lumicon GEG and filters

["Bert Katzung" <katzung1@attbi.com>]

Hi Manolo:
Welcome to the challenging world of astro-imaging! This is a good list (and
has a great archive) for getting tips on emulsion imaging. Here are my
thoughts about your questions:
1. I would say that if you can find a GEG you should go ahead and get it.
There is nothing in it that will wear out, so Lumicon's going out of
business won't affect its usefulness. (In fact, it may get more valuable!)
As you probably know, fork-mounted SCTs are difficult to guide accurately
and an off-axis guider like the GEG can help greatly.
2. For filters, I would recommend starting out with the smallest Hutech
light-pollution filters that works with one of your lenses and see if it
makes a difference with your amount of light pollution. If not, you can save
yourself a lot of money --- the large sizes (eg, 82 mm for my biggest
telephoto) are quite expensive. But they are the best available and can be
used in the future if you switch to CCD. I got two: one that would fit the
prime focus T-adapter and smaller lenses and one big one for the larger
lenses. I use step-down rings to adapt the big one to intermediate size
lenses. Note that the Hutech  LPR will not work with wide-angle lenses ---
it's an interference filter and gives diffraction rings on wide angle shots.

Hope this helps....
Bert

Bert Katzung
katzung1@attbi.com
www.astronomy-images.com

----- Original Message -----
From: "Manolo" <marana1@san.rr.com>
To: <astro-photo@seds.org>
Sent: Tuesday, October 01, 2002 11:54 AM
Subject: [APML] Lumicon GEG and filters


> Hello all,
>
>  I am Manolo Arana and I just joined the group from San Diego. My
experience level in astrophotography is basic, so I'll be probably one of
the quiet members who goes to sleep learning quite a lot from all of you.
Thank you to let me join your group. I love photography and astronomy, but
just a beginner in the first one.
>
>  I have a 10'' LX-200 f/10, and although my budget is limited I would like
to slowly buy good and useful equipment. I also have a Canon New F-1 with a
small set of fast lenses. So far autoguiding with CCD is one of my future
projects, but I am not in a rush since I have so much to photograph with my
set of lenses.
>
>  I have two questions:
> 1- GEG: since Lumicon went out of business recently, I am not sure if I
should go ahead and get one. I plan on shooting 35mm at prime focus, and I
read lots of good reviews about it. I'd like to know what your
recommendation is about getting a GEG, and this one in particular.
> 2- Filters for my different aperture lenses. Would you recommend a filter
set (or a few pics) for each of my apertures?
>
>  I will shoot from the mountains surrounding San Diego (around 1000-1500
meters high), low dew, and although the skies are great here, there is
(unfortunately) a little of red light pollution from Mexico and San Diego.
>
>  Thank you very much in advance.
> Regards,
> Manolo.
>
>
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