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paulsky
sage
Reged: 02/17/04
Posts: 384
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Hello,
My question is if a refractor telescope with 350 or 400 mm of focal lenght and 60-80 mm apertute is a good performer for observing objects of Deep Sky like N,America nebula, Veil nebula, Crescent...
Paul
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 6778
Loc: Beatrice, Nebraska
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Quote:
Hello,
My question is if a refractor telescope with 350 or 400 mm of focal lenght and 60-80 mm apertute is a good performer for observing objects of Deep Sky like N,America nebula, Veil nebula, Crescent...
Paul
Well, if you keep the power fairly low (15x to maybe 30x) and use a nebula filter, this kind of aperture can be used to see those objects. Larger apertures will show them better, but something like an 80mm f/5 will "get your feet wet", especially for the larger objects. Clear skies to you.
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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info
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walt r
Carpal Tunnel
Reged: 02/13/07
Posts: 2417
Loc: Doylestown, PA
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Yes, IF you have a very dark sky. These objects (add M31 to this list) are in the order of 2-4 degrees across so a wide FOV nicely frames them and also makes them easier to find.
Check out this Eyepiece Calculator to see which EP will give the desired FOV.
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Walt
Obsession 18" f/4.45 #1370 AN/SC
MK67 Deluxe 6" f/12 Mak-Cass, Super Polaris GEM, JMI MicroMax DSC
DIY 60mm f/6 Achromat
Cookbook 245 CCD
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Mr. Bill
Carpal Tunnel
Reged: 02/09/05
Posts: 2759
Loc: Just passing through.....
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Quote:
Hello,
My question is if a refractor telescope with 350 or 400 mm of focal lenght and 60-80 mm apertute is a good performer for observing objects of Deep Sky like N,America nebula, Veil nebula, Crescent...
Paul
Hi Paul
I highly recommend the Orion 120mm f/5 achromat refractor for this duty. It has good light grasp and works well with a 32mm ep.
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10x50 Fujinon FMT-SX binos
15x70 AP binos + Paragon p-mount
Oberwerk 100BT 45 degree + Hercules fork mount
120mm f/5 Orion achromat + Moonlite focuser
140mm f/5.7 Vixen NeoAchro Petzvel refractor
150mm f/6.5 Antares achromat
150mm f/8 homemade achromat....EE Barnard MW Sweeper
8 inch newt with f/5 Swayze mirror
10 inch f/4.7 Orion newt + Paracorr
15 inch f/5 Discovery split tube
35mm Pan, 26mm Nagler, 17mm Nagler, 13mm Ethos, 8mm Ethos
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