Comet McNaught January 11, 2007

Comet McNaught
Comet McNaught January 11, 2007 (Sunset)
Canon EOS 20D  1/60 sec.  Canon 100mm Macro f/2.8  1600 ISO  Tripod
Snow on the ground +10 degrees Fahrenheit  Hundreds of Canadian Geese in the air
Fern Ridge Reservoir, 7 miles from Eugene, Oregon




Aurora, Leo, Jupiter and Iridium Flare

                                 Aurora, Leo, Jupiter,   Iridium Flare and Meteor ; June19,2004
Telescope / Lens 35mm  f/2 Canon at f/2.8
Mount Type Piggyback on Losmandy G11
Camera Canon F-1 with Bright Screen & Angle B magnifier
 Filters  UV
 Film  Kodak ED200 (Slide Film) Slide #05
 Exposure 120 seconds; manual guiding FS/78
 Processing Pushed, Scanned – 2400 dpi, Photoshop
 Date June 19, 2004
 Location Eagles Rest, south of Dexter, Oregon
 Conditions 2500′ magnitude 6 Skies; Clear, steady




Orion Rising in the East


Wide field image of Venus on left & Orion on right rising over trees.  
Telescope / Lens 50 f/1.4 Canon Lens at f/2.8
Mount Type Piggyback on Losmandy G11
Camera Canon F-1 with Bright Screen & Angle B magnifier
 Filters 52mm UV
 Film  Provia 400F (Slide Film) #10
 Exposure 15 minutes; manual guiding Takahashi FS/78
 Processing  Slide Scanned – 2400 dpi, Photoshop
 Date September 26, 2003
 Location Eagles Rest, south of Dexter, Oregon
 Conditions 2557′ magnitude 6 Skies; Clear, steady










M31 NGC224 Andromeda Galaxy


M31       NGC224        Andromeda Galaxy     ST10XME (SBIG) LRGB     3.5 Hour Exposure



M 31 (NGC224) Andromeda Galaxy
The Andromeda Galaxy is readily visible from a dark sky location as a fuzzy patch of light covering approximately 3+ degrees or 6 times the width of our moon. Andromeda is approximately 2.5 million light years from Earth and 220,000 light years across. Making it much larger than our own Milky Way galaxy at only 100,000 lights years across. In about 5 billion years both our Milky Way galaxy and Andromeda will collide and begin to coalesce, perhaps evolving into an even larger elliptical type galaxy. This image reveals much detail and numerous globular star clusters and nebulae are visible. Amazing for just a 3.2 diameter refractor, but Thomas Back (TMB) was a primer Telescope Maker and his designs live on.

Telescope / Lens TMB 80 mm f/6 with Tele-Vue .8 reducer f/4.8 384 mm
Mount Type Astrophysics 1200
 Filters Astrodon LRGB e-series  filters (generation 1)
 Film  CCD
 Exposure 210 minutes (3.5 Hours) LRGB (L=120 min (10 min. x 9 & 5 min. x 6) RGB= 1.5 Hours. (10 min. subs)
 Processing CCDSoft, CCDStack, AIP, Photoshop CS2
 Date  09/21/2009
 Location Snow Peak, S/E of Cottage Grove, Oregon 122° 52′ 35″ W, 43° 31′ 21″N
 Conditions 4658′ elevation, magnitude 6 Skies; Clear ; Humidity 65-80% 51 degrees, wind 0-3 M.P.H.


Eyepiece Field of View (FOV)

Field of View

By: Sam Pitts 2001

What is my Field of View

This depends on your eyepiece’s magnification and apparent field of view, along with the telescope being used. The eyepiece has a focal length indicated in millimeters. The longer the focal length of an eyepiece (25mm-50mm) the lower the power (magnification) and the wider the field of view. This assumes we are using the same telescope with a fixed focal ratio (f/10) and length (fl/2000). The higher the power or magnification the shorter the focal length in millimeters, resulting in a smaller field of view (FOV).

To determine the magnification of an eyepiece, divide its focal length into the focal length of the telescope’s objective lens or mirror. 8″ f/10= 2000mm focal length (fl).

Telescope: 8″ f/10 – 2000mm fl (focal length)
Plossl Eyepiece 32mm with 50° FOV (apparent field of view)
Magnification 2000mm ÷ 32mm = 62.5x

The field of view with this setup is determined by eyepiece magnification and apparent field of view 50°. Hold an eyepiece and look through it. The circular view of light observed is its apparent field of view. The diameter of this circle is the apparent field of view measured in degrees. Below is a list of apparent field of views with different types of eyepieces.

Tele Vue ® Nagler™ 82°
Tele Vue® Radian™ 60°
Meade® Ultra Wide 84°
Erfle 60°
Orion® Ultrascopic™ 52°
Plossl 52°
Orthoscopic 45°
Kellner 40°

Find the Field of View

To find the actual field of view, divide the eyepiece’s apparent field of view by the magnification on a particular scope. Using the example above (8′ f/10 scope ).

50° ÷ 62.5 = 0.8°

The 32mm Plossl on an 8″ f/10 (2000mm) telescope will render a true field of view of 48 arc minutes or 8/10 of a degree. Remember the moon is approximately 1/2° (30′) in diameter. Wide field of view lenses may suffer from aberration near the edges due to astigmatism. The stars may be slightly distorted near the edge of the field of view.

A 32mm Tele Vue Nagler 82°, with the same telescope, would have a FOV of 1.312° or 1° 18′ 43.2″
A 32mm Kellner 40°, with the same telescope, would have a FOV of .64° or 38′ 24″

Eyepieces > 32mm are best used with 10″ or larger objectives/mirror and a 2″ diagonal.