21 deepsky tips

Post your comments in regards to recent Articles and Reviews.
Post Reply
User avatar
John Baars
Mars Ambassador
Articles: 1
Posts: 161
Joined: Sat May 11, 2019 9:00 am
Location: Schiedam, Netherlands
Has thanked: 374 times
Been thanked: 374 times

21 deepsky tips

#1

Post by John Baars » Wed Oct 02, 2019 3:58 pm

21 deepsky observing tips
by John Baars

A list of 21 deepsky tips that will make you a better observer 1. You have to make sure that the viewfinder and telescope are aligned with each other. But almost everyone will undoubtedly have done that already and we assume that. There are also amateurs who swear by a Red Dot Finder: a small red dot...
Read more...
Telescopes in Schiedam : SW 150mm F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
Eyepieces: Kitakaru, Eudiascopic, Jena, Panoptic, Nagler, Morpheus, Leica ASPH, Brandon, Parks, Fujiyama, Pentax XO.
Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.

Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.

Amateur since 1970.
User avatar
Gordon
Site Admin
Articles: 0
Posts: 1381
Joined: Wed Apr 24, 2019 10:52 pm
Location: Cottonwood, AZ
Has thanked: 1589 times
Been thanked: 1303 times
Contact:

TSS Awards Badges

Re: 21 deepsky tips

#2

Post by Gordon » Wed Oct 02, 2019 5:11 pm

Thanks for posting this article John!

Lot's of great information!
Gordon
Scopes: Explore Scientific ED80CF, Skywatcher 254N, Orion ST80, Orion Atlas EQ-g mount, Orion SSAG guider. Baader MPCC MkIII coma corrector, Vixen 70mm refractor. Lunt LS35THa solar scope. Skywatcher EQ5pro mount. Imagers: ZWO ASI1600 MM Cool, ZWO ASI174mm-C (for use with my Quark chromosphere), ZWO ASI120MC Filters: LRGB, Ha 7nm, O-III 7nm, S-II 7nm Eyepieces: a few, Primary software: Cartes du Ciel, EQMOD, SGP, Nebulosity, Photoshop, StarTools V1.4
Blog: http://ghswen.blogspot.com/
Image
User avatar
helicon
Co-Administrator
Articles: 1
Posts: 1440
Joined: Mon May 06, 2019 1:35 pm
Location: California
Has thanked: 1584 times
Been thanked: 1711 times

TSS Awards Badges

Re: 21 deepsky tips

#3

Post by helicon » Wed Oct 02, 2019 5:45 pm

Thanks John, excellent tips and tricks.
-Michael
Various scopes, 18" Obsession Dob, 10" Zhumell Dob, ES AR152, AWB 5.1" Onesky newt, Oberwerk 25x100 binos, two eyeballs
User avatar
Michael131313
Mars Ambassador
Articles: 0
Posts: 195
Joined: Sun May 12, 2019 5:39 pm
Location: San Jose del Valle , Nayarit, Mexico
Has thanked: 618 times
Been thanked: 244 times

Re: 21 deepsky tips

#4

Post by Michael131313 » Wed Oct 02, 2019 5:51 pm

Thanks John. Appreciate it very much.
ES AR 102 102mm, f/6.5, Orion Starblast 4.5 114mm,f/4 , Celestron 10x50, GSO SV 30mm, ES 68° 20mm, ES 82° 14mm, 11mm, 8.8 mm, 6.8mm, 4.7mm. Twilight 1 mount.
User avatar
Lady Fraktor
Co-Administrator
Articles: 0
Posts: 1330
Joined: Mon Apr 29, 2019 9:14 pm
Location: Slovakia
Has thanked: 2763 times
Been thanked: 1840 times

Re: 21 deepsky tips

#5

Post by Lady Fraktor » Wed Oct 02, 2019 6:28 pm

An excellent article of practical viewing tips John, thank you for posting it.
Proper Telescopes: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNGDX 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen ED115s f/7.7
Mounts: Celestron CG-5 w/ Argo Navis & tracking motor, SLT w/ pier & tripod mods, Manfrotto 028b w/ SV M2C, Mantrotto 055Pro w/ 128RC, TAL MT1C, Vixen SXP w/ HAL-130 & half pier
Diagonal: 2" A-P Maxbright, 2" Baader Herschel Wedge (P), 2" Zeiss/ Baader Amici Prism (DX2), 2" Orion Amici Prism, 2" Stellarvue DX, 2" TeleVue EverBrite
🇸🇰Image
User avatar
Bigzmey
Orion Spur Ambassador
Articles: 1
Posts: 943
Joined: Sat May 11, 2019 7:55 pm
Location: San Diego, CA USA
Has thanked: 1430 times
Been thanked: 1314 times

TSS Awards Badges

Re: 21 Deepsky observing tips

#6

Post by Bigzmey » Wed Oct 02, 2019 7:20 pm

Nice refresher John!
Scopes: Stellarvue: SV102 ED F7; Celestron: 8" SCT F10, Omni 150R Achro F5, Onyx 80ED F6.3, Mak 127mm F12; Meade: ST80 F5. Mounts: ES Twilight I, Bresser EXOS2, SW SkyTee2, AzGTi, UA MicroStar. Binos: Orion 15x70, 10x50, Nikon 8x40. EPs: Pentax: XWs; TeleVue: Delites, Plossls & barlows; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Meade: UWAs & Plossls. Diagonals: Baader: BBHS mirror, Zeiss Spec prism, Clicklock; TeleVue: Evebrite. Filters: Lumicon, Baader, Astronomik. DSO tally: 1564 (Completed: M110, H1, H2. In progress: H3: 179, H2,500: 1156, S110: 77). Doubles: 859, Comets: 13, Asteroids: 62
User avatar
smp
Orion Spur Ambassador
Articles: 0
Posts: 574
Joined: Sat May 11, 2019 10:34 pm
Location: NH, USA
Has thanked: 708 times
Been thanked: 691 times

Re: 21 deepsky tips

#7

Post by smp » Wed Oct 02, 2019 8:31 pm

Much appreciated! Thanks very much.

smp
Stephen
- - - - -
Telescopes: Tele Vue TV-85; Questar 3.5 Standard SN 18-11421; Celestron C6
Solar: Thousand Oaks white light filter; Daystar Quark (chromosphere) Hα filter
Mounts: iOptron Az Pro; Explore Scientific Twilight I tripod w/ Celestron NexStar GT mount; Majestic heavy duty tripod
Local Club: New Hampshire Astronomical Society
User avatar
bladekeeper
Co-Administrator
Articles: 0
Posts: 1828
Joined: Thu Apr 25, 2019 2:39 am
Location: Lowell, Arkansas, US
Has thanked: 5442 times
Been thanked: 3125 times

Re: 21 Deepsky observing tips

#8

Post by bladekeeper » Sat Oct 05, 2019 1:09 am

Great write-up, John! :)
Bryan
Scopes: Apertura AD12 f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8; iOptron MC90 f/13.3; Orion ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Unitron Model 142 f/16; Meade NG60 f/10
Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen Polaris
Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett Gemini 12×60 LW, Gordon 10×50, Apogee 20×100

Image
User avatar
notFritzArgelander
Local Group Ambassador
Articles: 0
Posts: 2454
Joined: Fri May 10, 2019 4:13 pm
Location: Idaho US
Has thanked: 3310 times
Been thanked: 6279 times

TSS Awards Badges

Re: 21 Deepsky observing tips

#9

Post by notFritzArgelander » Sat Oct 05, 2019 1:54 am

Definitely a recipe for success.
Scopes: Refractors: Orion ST80, SV ED80 A f7; Newtonians: Z12 f5; Catadioptrics: VMC110L, Intes MK66. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG
User avatar
kt4hx
Jupiter Ambassador
Articles: 3
Posts: 261
Joined: Sun May 12, 2019 12:18 am
Location: Virginia, USA
Has thanked: 332 times
Been thanked: 653 times

TSS Awards Badges

Re: 21 Deepsky observing tips

#10

Post by kt4hx » Sun Oct 06, 2019 2:01 am

Thanks for putting some good advice out there for the beginning observers John. Lots of info to consider and put into practice in order to become a better observer. I would like to make a couple of comments if I might, for your paragraphs 13 and 14.

"13. You can also think of a deepsky filter, but do not expect the difference of day or night. Usually it is a subtle difference. And sometimes surprising. UHC filters and OIII filters are commonly used. Be sure the exit pupil of your telescope to be at least 2-3 mm. Those filters eat light. Sometimes even 5 mm is necessary."

Having narrow-band UHC or O-III filters of both narrow and wider bandwidths can be useful. Something in the range of 12 to 15nm bandwidth are excellent for use at lower magnifications as you indicate. They dim the field noticeably but at the wider exit pupils enough light is gathered to compensate. When using small apertures or high magnification then a wider bandwidth filter in the 20 to 30nm range can be beneficial. These do not reduce field brightness as much while still boosting contrast of the target object. For instance, if you are observing a planetary nebula using a narrow-bandwidth O-III and want to increase to high magnification, the field severely darkens due to the smaller exit pupil. By switching out the narrow-bandwidth filter for one of larger bandwidth, this will counteract the impact of an overly dimmed field and still yield visible contrast increase.

Also, thank you for pointing out the issues of the wide-band deep-sky filters often marketed as light pollution reduction filters (LPRs). Visually the impact is subtle as you stated. Having used them in both light polluted conditions and dark sky conditions, they can indeed boost contrast, albeit minutely. It takes a trained eye to really see their benefits, and even so, it is not significant. In fact, in areas with a lot of LP, they are pretty much useless because high levels of sky glow will swamp the filters rendering them totally ineffective. I have never seen an object using the wide-band LPR filters that I could not already see without it. However, imagers can get good results from the use of LPRs because imaging sensors are far more sensitive than are our eyes.


"14. The best deepsky filter is the jokingly called "gasoline filter": a long drive to a place where it is really dark. After several hours in complete darkness the sky looks less dark than when you started. It is not the sky. It is you own completely adapted eyes that take care of that. A look at the limiting magnitude of your telescope will prove it. A long forgotten ability of our eyes from the times we were hunters."

I am glad you mentioned the gasoline filter axiom. I definitely subscribe to this thinking. Darker skies are the great equalizer, more so than aperture alone. For instance, when comparing our suburban backyard to our dark site house, I have found consistently that the 10 or 12 inch dobs used at the dark site keeps pace with the 17.5 inch used in our more light polluted home backyard. It simply is a day and night difference between the two locations, and that truly makes the bigger difference. :)
Alan

Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob
ES AR127 f/6.5 & ED80 f/6 on Twilight-II || Apertura 6" f/5 Newtonian on Twilight-I
ES 82° 24mm, 18mm; Pentax XW 70° 10mm, 7mm, 5mm + 2 inch and 1.25 inch Barlows
DGM NPB Filter || Orion Ultra Block, O-III and Sky Glow Filters || Baader HaB Filter
---------------------------------------------------------------------------
"Astronomers, we look into the past to see our future." (me)
"What we know is a drop, what we don't know is an ocean." (Sir Isaac Newton)
User avatar
OzEclipse
Jupiter Ambassador
Articles: 0
Posts: 274
Joined: Sat May 11, 2019 8:11 am
Location: Canberra, Australia, 35S, 149E
Has thanked: 477 times
Been thanked: 607 times
Contact:

Re: 21 Deepsky observing tips

#11

Post by OzEclipse » Sun Oct 06, 2019 8:08 am

Rreally sound advice John.

Excellent article.

Joe
40 years in amateur astronomy - 1978-2018
Astronomical interests : astrophotography, visual observing, night-scapes, solar eclipse chasing, asteroidal occultations
Bortle 1-2 skies, 149 E, 35 S
web site : http://joe-cali.com/
SCOPES - ATM 18" Dob, Vixen VC200L, ATM 6"f7, ED80
CAMERAS : Pentax K1, K5, K01 / VIDEO CAMS : TacosBD, Lihmsec
User avatar
The Happy Parrot
Mars Ambassador
Articles: 0
Posts: 157
Joined: Mon May 13, 2019 10:03 am
Location: Happy Valley, Massachusetts
Has thanked: 337 times
Been thanked: 166 times

Re: 21 deepsky tips

#12

Post by The Happy Parrot » Wed Oct 09, 2019 12:38 pm

Good information as always JB, especially for beginners like me. Worth reading over and over.

THP
Post Reply

Return to “Articles and Reviews”