FreeLists / az-observing / [AZ-Observing] Re: Mars Sunday night

["Rotramel, Rick (AZ77)" <rick.rotramel@xxxxxxxxxxxxx>]

Oops, 23A is ORANGE !!

Rick 
SAC


> -----Original Message-----
> From: Rotramel, Rick (AZ77) [SMTP:rick.rotramel@xxxxxxxxxxxxx]
> Sent: Monday, September 08, 2003 9:20 AM
> To:   'az-observing@xxxxxxxxxxxxx'
> Subject:      [AZ-Observing] Re: Mars Sunday night
> 
> Another way of reducing the glare of bright planets is to use an "aperture
> stop" on the newtonian. Pierre S. made me and others too, a disk of
> masonite
> with a small hole on one side of which you place over the skyward end of
> the
> newtonian telescope with the hole placed in between the spider vanes. My
> 6"
> aperture stop changes my
> 16" f4.4 into a pseudo 6" f12, (note, the focal length stays the same). It
> works great.
> 
> Concerning filters for viewing Mars, I have taken the advice of the late
> Mars observer at Lowell Observatory, Chick Capen, and use a #12 Yellow and
> a
> #23A Red together in the eyepiece. This gives you fine contrast for the
> surface features.
> 
> Rick R.
> SAC 
> 
> PS: Anyone else seen this great site for Mars Images and Drawings?
> 
> <http://homepage3.nifty.com/~cmomk/2003/f_image.html>
>        
> > Jeff Hopkins wrote:
> > > I tried various red filters, a moon filter and no filter. Surprising, 
> > > at times the moon filter seemed to work best. Other times the red 
> > > seemed to help a bit and still others more could be seen with no 
> > > filter.
> > 
> > I've experimented with stacking the 23A and Moon filters, as you
> > suggested, several nights over the last week. When the seeing settles,
> > this combination has produced some nice, contrasty views. Thanks for the
> > tip.
> > 
> > Regards,
> > 
> > Bill Ferris
> > Flagstaff
> > 
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