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Thread: Best eyepiece for deep space viewing

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    Default Best eyepiece for deep space viewing



    Viewing with a Omni XLT 150 Reflector. When first hunting for deep space objects is it better to use my 32mm 52 degree eyepiece or buy a 40mm 70 degree eyepiece to first help locate deep space objects. Thanks Tom
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    Your 32mm eyepiece will show you more than 2 degrees of the sky (750mm focal length/32mm = 23.4 Magnification; 52 degrees/23.4 = 2.2 degrees), that should be plenty for finding objects. For example, my widest field of view is 1.3 degrees and that works just fine.
    Also, a 40mm eyepiece will produce an 8mm exitpupil on your scope, which is wider than most people's pupils can open, so you would be wasting some light that way.
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    What about a 20mm 66degree eyepiece? I'm looking for a wider field to help find objects. Thanks

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    Hi tomcat,

    I can recommend GSO Superview 20mm 67deg.Also I have the Williams Optics 20mm 66deg, also very good for wide field views.Both of these eyepieces barlow well with either 2x or 3x GSO barlows. I use both of these to give equivalent of 10mm and 6.67mm eyepieces. Using the barlows preserves both the wide field views and the generous eye relief of the 20mm eyepiece. I also use a Moonfish 20mm 70deg, but in my f5 scope find coma to be an issue near the edge of the FOV.

    Stephen.(44deg S.)

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    Quote Originally Posted by tomcat View Post
    Viewing with a Omni XLT 150 Reflector. When first hunting for deep space objects is it better to use my 32mm 52 degree eyepiece or buy a 40mm 70 degree eyepiece to first help locate deep space objects. Thanks Tom
    Hello Tomcat,

    my working horse with the 6incher f/5 refractor is the 16mm 82deg Astro Professional EP. All depends on the typical quality of your sky. Should you have the country sky (Bortle4), then you may take wide field EPs above 15mm. Should you have the suburban to urban sky (Bortle5-6 or higher), then wide field EPs around 15mm do a better job.

    Best

    JG
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    Thank's For the feedback everybody. Tom One thing i forgot to ask was what color filter works best for nebula? Thanks again

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    Quote Originally Posted by tomcat View Post
    Thank's For the feedback everybody. Tom One thing i forgot to ask was what color filter works best for nebula? Thanks again
    Hello Tomcat,

    there are two sorts (among other) of filters, you can use to increase the contrast of the nebulas. There is a mass of threads and pots on this issue, check out the latest one, please

    Nebula filters?

    Should you definitely wish a color filter for the nebulas, the blue(RGB) from Baader transmitts 400nm up to about 510nm, including the nebular emission lines H-Beta and the both OIII, but kills the loight pollution in green, yellow and red. The contrast of the nebulas will be slightly increased, but by far not as much as with the nebular filters. You can also use this filter for the observation of the planets.

    But back to your EP question. I also have the Baader Aspheric 31mm 72deg, but it has that 2" thread for the filters, making it expensive to buy the filters. I do not use it very often, as my sky is typically Bortle5.

    Once again, wishing you your very best

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default

    Thanks i'll check them out.

 

 

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