Image of the day

Captured by
Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Dave Mitsky

May 24, 2005 09:09 AM Forum: Star Parties

CSSP anyone?

Posted By Dave Mitsky
Doug,

On the best of nights seventh magnitude stars have been seen at CSSP without visual aid.

Dave Mitsky

May 26, 2005 09:45 AM Forum: CCD Imaging and Processing/Deep Sky

Open Clusters M67 and NGC 2539

Posted By Dave Mitsky
Jim,

Where did you find the nickname for M67? I wasn't aware that it had one.

http://www.seds.org/messier/m-names.html

http://www.seds.org/messier/xtra/supp/d-names.html

http://www.geocities.com/rasctb/objnames.htm

http://www.seasky.org/astronomy/astronomy_messier_61to70.html

Dave Mitsky

May 26, 2005 10:11 AM Forum: After Dark

Death of a Coolpix

Posted By Dave Mitsky
You may want to consider the new D50.

http://www.imaging-resource.com/PRODS/D50/D50A.HTM

BTW, I believe that this post would be more appropriate for the Equipment or Nikon forums.

Dave Mitsky

June 2, 2005 12:36 AM Forum: Beginning Astronomy?

Evolution of the astronomer

Posted By Dave Mitsky
While I've dabbled with astrophotography/imaging for years, it will never replace visual observing for me. Communing with nature may be somewhat of a cliche but it has a strong appeal nevertheless.

Many of the shots that I've taken I've been pleased with but the process has often been very frustrating and time consuming.

Dave Mitsky

June 7, 2005 02:28 PM Forum: Eyepieces

Meade 32mm SWA

Posted By Dave Mitsky
Jeffrey,

At one time I owned one of the old Japanese versions of the 32mm SWA. It worked well enough in an f/6.5 Cave Newtonian but displayed some astigmatism in my f/4.8 Starsplitter and a friend's f/5 Obsession. I believe that the SWA is a modified Erfle and is somewhat similar, but not as good as, the old Tele Vue Wide Field.

Dave Mitsky

June 8, 2005 06:52 AM Forum: Eyepieces

TV Radians...or equivalent

Posted By Dave Mitsky
Mark Mittlesteadt said:
Does anyone have any suggestions for higher power EP's (12mm and 8mm, or thereabouts) that still have the eye relief of the TV 32mm Plossl as well as a similar FOV, without the price of the Radians?

Mark,

You mentioned a 12mm focal length eyepiece. For this focal length to have the same true field of view as a 32mm Ploessl it would have to have an apparent field of view of 32/12 x 50 degrees or 133 degrees.

As has already been mentioned, sharpness varies inversely with magnification.

Dave Mitsky

June 8, 2005 07:33 AM Forum: Solar System Observing

June New Moon Spotting Contest

Posted By Dave Mitsky
Curt,

I observed the very young crescent Moon, first with an 8x42 binocular and then with the naked-eye, shortly after 9:00 p.m. EDT (01:00 UT) on Tuesday evening, June 7. I took a number of photographs with my Canon EOS Digital Rebel and 18-55mm and 80-200mm zoom lenses. The Moon was fairly close to the horizon in the west-northwest, about 7 degrees to the lower right of Venus, and was eventually covered by some low clouds, which incidentally made for quite a colorful sunset.

My location was a hilltop just east of Harrisburg, Pennsylvania.

Dave Mitsky

June 9, 2005 02:45 AM Forum: Eyepieces

The 1.5-3mm Exit Pupil 'Sweet Spot'

Posted By Dave Mitsky
I believe that the sweet spot refers to the fact that the human eye has a maximum resolution at an entrance pupil of about 2mm.

Dave Mitsky

June 10, 2005 01:52 PM Forum: Eyepieces

7mm nagler, 6mm radian, or Meade 5.5?

Posted By Dave Mitsky
The 1.4x rule of thumb (between the two eyepieces) would seem to indicate the 7mm Nagler, assuming that it is a type 6 and not a type 1, and that would be my choice nevertheless. I am very happy with my 7, 9, and 13mm type 6 Naglers.

Dave Mitsky

June 11, 2005 01:21 AM Forum: Beginning Astronomy?

Is there a recommended/definitive sky chart?

Posted By Dave Mitsky
Tirion's _Bright Star Atlas 2000.0_ is both inexpensive and handy to use.

Dave Mitsky

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